524 



PIIOCF.EDINGS OF THE NATIONAL MUSEUM. 



VOL. XXVIII. 



lUjixilliiKMls. Their jiKlu-nioiit of the coui-se taken by the several nerves 

 may W(>11 have l)eeii biased h\ these mistakes. The present author 

 has had no opportunity of verifying- or disproving their statements by 

 an examination of tiie same species. 



The simihirity in the structure and use 

 of the appendages of all the genera here 

 considered renders it pro])al)le that their 

 imiervation is practically the same, dili'er- 

 ing only in minor details. 



REPRODUCTIVE ORGANS. 



These consist in the female of a pair of 

 ovaries, a long, more or less convoluted 

 ovitluct connected Avith each, a pair of 

 semen receptacles, glands for secreting the 

 material of the external Q^g cases and 

 these cases themselves (tig. -IS)). 



The ovaries (o) are large oval or kidney- 

 sha[)cd l)odies situated on either side of 

 the anterior portion of the dorsal surface 

 of the stomach. When fully developed 

 they extend from the lirst swinmiing legs 

 to the base of the second maxilhe and can 

 be plainly seen through the canipace in 

 doi'sal view. Each gives oil' an oviduct 

 (o. d.) from the ventral surface at the an- 

 terior margin (tig. 30). This duct runs 

 backward in ncnirly a straight line through 

 tlu^ thoracic area, the free segment, and into 

 the genital segment. As soon as it enters 

 the latter it increases quickly in size and also 

 becomes convoluted. The nund)er and ar- 

 rangement of the convolutions varv consid- 

 era))ly in tht' different species as well as the 

 genera, as may be seen ])v consultingtigures. 

 In general, the convolutions attain their 

 maximum nund)er and size just before the 

 extrusion of the external Qgg cases, and as 

 soon as the latter are fully formed the 

 oviduct has become nearly straight. This condition is retained at 

 least for some time subsequent to the hatching of the eggs and the 

 throwing off' of the Qgg tu))es, since the adult females are often found 

 in the condition shown in tig. 31. 



On the ventral surface of the convolutions can be found an oblong, 

 nearly transparent gland, closed at the anterior end, and at the poste- 



FiG. 29.— Fkmai.e reproductive 



ORGANS OF CaLIGI'.S BONITO. 



(Drawn by Ejierton.) e. K-. 



CEMENT GI.AND; e. C, EXTERNAL 



EGG cases: o. ov.iRY; o. d., ovi- 

 duct; s. r., SEMEN receptacle. 



