274 



ZOOLOGY. 



mental males are degraded, imperfect form^, with sometimes 

 no mouth or digestive canal. The apparent design in nature 

 of their different sexnal forms is to effect cross fertilization. 

 The eggs pass from the ovaries into the body-cavity, where 



Fig. 393,— Anatomy of Lepas fasdcularls, A. c, 6lx pairs of legs or cirri ; /, flia. 

 menrary appendiiges ; m, month ; «, ptomach ; A, openings of the liver (0 into tlie 

 ptomach, wliich is represented as laid open ; i, intestine ; a, vent ; I, testis ; v, vasa 

 deferenlia, one cut on ; p, male appendage ; o, ovary ; e, adductor muscle connecting 

 the two basal valves ; vs, ecutal valve ; w, carinal valve ; vt^ tergal valve. Enlarged 

 twice. 



B. 1. pnlpufl ; 2, mandibles ; .3 and 4, first and second maxillae. 



0. Nervous system, s, brain, sending the optic n-rves to the rudimentary eye (e), 

 each optic nerve havinc; an enlargement near the eye, i. e., the ophthalmic ganjriion (o); 

 between o and a are the nerves which go to the peduncle ; a, nerve sent t'l the a/l- 

 (tuctor Bcutorum. ; ce, commissure between the supra- and infra(Esophai.'cal ganglia (n) ; 

 c, c, e, c, c, c, nerves to each of the six feet Enlarged four times.— After Kingsley. 



they are fertilized, and remain for some time. They pass 

 through a morula condition, a suppressed gastrala or two- 

 layered state, and hatch in a form called a KaupUus, from 

 the fact that the free-swimming larva of the Entomostraca 



