INTERNAL ANATOMY OF THE GAMASINJ?. 321 



Fig. 33. The anterior portion of the genital system, but without the testis, of an adult male Lalaps lavis ■ 

 to show the two elliptical accessory glands (page 292) with the constriction at their points of 

 discharge. A single speruiatoeyst is travelling down one vas deferens. Tills was so in the 

 actual specimen. 



Fig. 34. (Left middle.) Sagittal median section through the testis oi Lmlaps l(Evis, x 150 (page 292), 

 showing the developmental history of the spcrm-mother-cell and spermatozoa, so far as It takes 

 place in the testis. 



Fig. 35. (The lowest line.) This is a series of drawings, numbered consecutively in small figures 1 to 

 11. It illustrates the history of the development of the sperm-mother-cells and spermatozoa 

 in Gamasus crasstts (page 293) ; all drawn, x 170. These are all taken from the testis of the 

 male ; the latest stage is to the right, but those found in the female are usually even more 

 filamentous. 



Fig. 36. (Right lower corner.) Outline of the rostrum (oral tube) and sternum, &c., seen from below, 

 of a male Ho'inogamasus hirsuius killed in coitn in an early stage of the coitus ; showing the 

 spermatic capsule still in the genital aperture of the male, and not yet full-sized nor containing 

 spermatocysts ; x 70 (page 295). 



Fig. 37. Spermatic capsule of the same species at its largest size, x 70; taken from a male killed iw 

 cultu at the moment when the spermatic capsule is about to be removed from the genital 

 opening of the male by the mandibles of the male ; it is now full of spermatocysts, &c. 



Fig. 38. Rostrum, mandibles, &c., seen from the side, of a male of the same species killed in coitu, at 

 the end of the coitus, after the contents of the spermatic capsule had been discharged and 

 after it had contracted by its elasticity; x 145. The rostrum has been dissected out; the 

 empty capsule is seen with its small end held between, and attached to, the two mandibles. 

 The lower part of the rostrum is shown in optical section, in order to exhibit the pharynx and 

 its musculation. 



Fig. 39. Rostrum, mandibles, &e., seen from the side, of a male Ltelaps cuneifer, killed in coitu, at the 

 same stage of tlie coitus as the last figure; x 150 (page 295). The spermatic capsule is in a 

 similar condition. 



Fig. 40. One mandible, seen from the side, of a male Gamasus crassus killed in coitu ; x 110 (page 290). 

 The greater part of the mandible and the whole spermatic capsule were inside the vagina of 

 female, and were dissected out after death. The spermatic capsule is seen passing through the 

 foramen in the movable arm of the chela of the male mandible. The anterior end of the 

 capsule lias been fractiired and destroyed ; its contents have been discharged. 



Fio-. 41. Genital aperture of a male of the same species killed in coitu at the moment when the spermatic 

 capsule is about to lca\e the aperture, x 110, showing the mode iu which the end of the 

 spermatic capsule, which emerges last, is folded over. 



Fig. 42. Spermatlieca of the female of the same species ; x 100. It arises as a stalked diverticulum 

 from the anterior end of the vagina, above and between the inner ciiitinized labia. 



Fig. 43. (Left lower corner.) The whole genital system of an adult female Sejus togatus seen from 

 above ; X 300. It shows the racemose form of the ovary, the paired oviducts, and azygous 

 vagina, all resembling Uropoda (page 309). The large central sac is the spermatheca, from 

 which proceed muscles which are omitted in this figure. 



Fig. 44. (A little to the right.) The spermatheca of the same creature seen from the side; x 100. 

 This is to show the nniscles attached to its hind and ventral surfaces. 



Fio-. 45. (Left top corner.) A group of ripe spermatozoa taken from the testis of an adult male Sejus 

 togatus; x 300. Those taken from spermatlieca of tie female are precisely similar. Compare 

 these with the penultimate form in Gamasus crassus, fig. 35, lo. 



Fif . 46. (Right lower corner.) General view of the alimentary and genital systems of an adult female 

 SECOND SERIES. — ZOOLOGY, VOL. V. 47 



