THE OSTKACODA 



Stomach-like intestine (Fig. 1244). The intestine opens at Uie 

 origin of the furcal appendages. 



Propagation. — The male sexual organs are usually large, of 

 complex structure, and may consist uf a whorled sack or spiny 

 cylinder, the ejaculatory duct (Fig. iJ4()/;j, cunnecting with the 

 testes and vas deferens, which may lead to a more or less chilinous 

 plate or penis (Fig. 1246 a). The testes usually consist of glands 

 which are partly extended within the shell proper and the shell 

 membrane, and may show through the shell as three or four gran- 

 ular bands (Fig. 1271 &), as in Candona and Cypris. The arrange- 

 ment of these testes may constitute a good generic character, as 

 in Spirocypris (Fig. 1267), where the testes originate in the ante- 

 rior part of the shell in parts of circles or circles. 



The ovaries may show through the shell in its posterodorsal 

 part, and are arranged somewhat as the testes (Fig. 1244). They 

 usually lead to a chitinous plate by a vaginal canal or oviduct, 

 which retains the semen and undeveloped eggs as with Cypris, and 

 commonly lie between the two lamellae of either valve, and extend 

 diagonally to the posterior extremity, where they curve up to form 

 a nearly semicircular band. Here the true germinal layer is found, 

 which forais the ovicells. These ovicells are poured from the 

 ovary into the body cavity, where they generally accumulate in 

 its posterior part on either side of the intestine. Here they 

 attam their full development and are fertilized, after which they 

 are laid. 



The inner genital organs of the male are more complicated 

 (Fig. 1246). As the ovaries, they are situated between the lamellar 

 of the valves, and commonly consist of a number of narrow and 

 elongate bands on either side, which are generally to be found 

 filled with numerous fine, thread-like bodies (Fig. i246(/), the sper- 

 matozoa, which may occasionall}' be curled up in si)iral groups. In 

 addition there are present a number of large nuclear cells (Fig. 

 1246 g). These are the gemiinal < .lis. <.r >pennat»K-ysts. fnim 

 which the spermatozoa develop. 



The efferent or ejaculatory apparatus (Fig. 124O/O conM>i-s ol 

 the spiny cylinder already mentioned. It seems to be comiK>sc<l of 

 an inner tube (Fig. 1246 c), supported by a complicated chitmouc 



