Iv 111

thrrr minute and forming a ..{ Jkflypkoiiui. Respiratory organs trachcal. opening by a pair of •piracies in the prcMoma above the baae of the fifth appendage OB Flo. 74,—CryploHtmma Karith*. antrrior aspect of the prosoma with the " hood " removed. I to IV, firmt to fourth appendage* of the prosoma ; a, bawl segment of the second pair of appendages meeting its fellow in the middle line (see fig. 75). (OffclMl drawtai each side. Intromittent organ of male placed at the distal end of the appendage of the 5th pair. Family — Cryptostemmidae (Crypto bonileroi islemma, Poliockera), Carlerous. Remarks on the Podogona. — The name given to this small but remarkable group has reference to the position of the male intro mittent organ (fig. 73, E). They are small degenerate animals with a relatively firm integument. Not more than four species and twice that number of specimens are known. They have been found FIG. 75. — Cryptoitemma KartckU, one of the Podogona. Ventral view. I to VI, The six pairs of appendage* of the prosoma, the last three cut short. I, a, 3, 4, The four somite* of the opisthosoma. a. Visible hood overhanging the first pair of appendages. b, Position of the genital orifice. c, Part of 3rd appendage. d.

Fourth segment of and appendage. Observe that the basal segment of appendage 1 1 1 does not meet its fellow in the middle line. (Original drawing by Porock and Pkkatddmbridge.) in West Africa and South America. A fact of special interest in regard to them is that the genus Poliochera, from the Coal Measure*. appears to be a member of the same group. The name Cryptostemma. given to the first-known genus of the order, described by Guerin-Meneville, refers to the supposed concealment of the eyes by the movable cephalic sclerite. Reference to literature (38). Order 8. Opiliones(see fig. 77).— Dorsal area of prosoma covered by a single shield usually bearing a pair of eyes. Sternal elements much reduced. Appendages of 1st pair large, three segmented and completely chelate; of and pair either simple and pediform, or prehensile and subchelate; of remaining four pairs, _ - /•-..«„,»,— similar in form, ambulatory in function; * 'f •. 7? • ~ *;' the basal segment of the and, 3rd and « sometimes ofthe 4th pairs of appendage* u furnished with sterno-coxal (maxillary) al lobe.

Opisthosoma confluent throughout comparison ."^ %* its breadth with the prosoma, with the tne n^"6 • m-n«- *> dorsal plate of which its anterior tergal plates are more or less fused; at most ten opisthosomatic somites traceable; the generative aperture thrust far forwards between the basal segments of the 6th appendages. Prae-genital somite suppressed. Respiratory organs tracheal, opening by a pair of stigmata situated immediately behind the basal segments of the 6th pair of appendages on what is probably the sternum of the and opisthosomatic somite and also in some cases upon the 5th segment of the legs. «^ Intromittent organ of male lying within the genital orifice. Sub-order a. Laniatores.— Orifice of foetid glands opening above the coxa of the 4th appendage, not raised upon a tubercle. Orifice of coxal gland situated just behind that of the foetid gland. Sternal plate of prosoma long and narrow, with a distinct prosternal element underlying the mouth. Coxae of 4th, 5th and 6th appendage* immovable. Appendages of and pair, strong, usually prehensile and spiny. Genital orifice covered by an operculum. Families — Gonoleptidae (Gimoleptes, Gonioioma). Biantidae (Biantes). Oncopodidae (Oncopus, Pelitntu).

Trioenonychidae (Trioenonyx, AcumonHa). Sub-order J. Palpatores.— Orifice of foetid glands opening above the coxa of the 3rd appendage, not raised upon a tubercle. Orifice of coxal gland situated between the coxae of the «h and 6th appendages. Sternal plate of prosoma usually short and wide, rarely longer than broad; with a larger or smaller prosternal element underlying the mouth. Coxae of 3rd, 4th, 5th and 6th appendages movable ™1 "