320 MR, A. I). MICHAEL OX THE VAEIATIONS IN THE 



Fig. 1(). (Left lower corner.) L<slaps {^^) ligomformis, sp. n. (page 316), ?, dorsal aspeet ; x 7.). 

 Mandibles almost entirely retracted. 



Fig. \7. (Near 16.) The same sjjccics ; chela of one of the mandibles of the male from the outer side ; 

 X 600. 



Fig. 18. Holotnsjiis montivagus (page 387) : distal portion of the epistomc of the female; x 345. This 

 organ is hyaline; the smaller, central, Y-shaped projection not so much as the rest. The basal 

 part of the organ, which is not drawn, is simply a continuation of what is drawn, forming a 

 sub-triangular lamina with slightly rough edges. The wavy lines shown on the figure are 

 markings, not hairs. 



Fig. 19. (Middle of right edge.) Gamasus crassus, Kramer (page 296) : chela of one of the mandibles 

 of the male seen from the outer side ; x 190. The obovate foramen is seen in the movable 

 arm, and the extremely minute poison-fang and duct (?) in the fixed arm. 



Fig. 20. The same species: epistome of male, three-quarter view from above; x 190. It is placed in 

 this position in order to show liow the distal end curves downward. The large central triangle 

 is hollow and contains fine cellular matter ; the peripheral part is dense chitin. 



Fig. 21. The same species : epistome of female seen from above; x 190. Wholly chitinized. 



Fig. 22. Eximlsory vesicle from one side of Hawogamasus horridus (page 311) ; x 65. 



Fig. 23. Pharyngeal chitinous skeleton of Hcemognmusvs horridus (page 310), three-quarter ^^ew from 

 below ; X 170. The truncated (upper) end is the oral end ; the small piece of tube springing 

 from the lower (pointed) end is the commencement of the cesophagus. 



Fig. 24, Four ripe spermatoeysts taken from the proximal end of the testis of a male Hcemogamasus 

 hirsutus immediately after diss(>ction in water containing a small quantity of potassium 

 acetate ; x 400. 



Fig. 25. Five spermatoeysts taken from the sacculus fcemineus of the female of tlie same species 

 immediately after dissection in similar liquid ; same amplification. 



Plati: XXXIII. 



Fig. 26. Four spermatoeysts taken from tlie ripest found in the testis of an adult male Lmlapn acuta 



immediately after dissection ; x 150. 

 Fig. 27. Group of spermatoeysts taken from tlie testis of an adult male L(elaps vacua immediately after 



dissection ; x 300. The lowest are the ripest. 

 Fig. 2S. Three spermatoeysts taken from the coriiu saceuli of a female of the same species immediately 



after dissection ; x .300. 

 Fig. 29. The whole genital system of an adult male Gumasus terridi/is (page 290), x 55, showing 



the two testes joined by a thin central liand, the azygous ductus ejaculatorius, and the great 



accessory gland. 

 Fig. 30. (Right middle.) The mIioIc genital system of an adult male Ltelaps cuneifer (page 292) > 



X 70. The organs are in the natural position, as seen from above ; the testis transversely 



across the body. The testis and vasa deferentia nearly hide the great accessory gland. 

 Fig. .31. (Left top corner.) The same system from the same species; x 150. The testis is turned over 



backward, and the vasa deferentia extended, so as to show the bifid distal end of the accessory 



gland. 

 Fig. 32. (Below fig. 30.) Terminal portion of the testis of the same species, x 300, showing tlie early 



condition of the sperm-mother-cclls and their development iuto riper spermatoeysts. The 



mature spermatoeyst is very large in this species. 



