274 



ZOOLOGY. 



mental males are degraded, imperfect forms, with sometimes 

 no mouth or digestive canal. The apparent design in nature 

 of their different sexual forms is to effect cross fertilization. 

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



Fig. 223. Anatomy of Lepas faxcicularis. A. c, six pairs of legs or cirri ; /, fila. 

 memory appendages ; m, mouth ; 8, stomach ; A, openings of the liver (/) into the 

 stomach, which is represented a* laid open; i, intestine; , vent ; t, testis ; v, vasa 

 defertiiti:i. one cut oil'; ]>, male appendage ; o, ovary : e, adductor muscle connecting 

 the- two basal valves; vs, scutal valve ; vc, carinal valve ; vt, tergal valve. Enlarged 

 twice. 



B. 1. palpus ; 2, mandibles ; 3 ana 4, first and second maxilla?. 



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

 eiich optic nerve hnvinstiin enlargement near the eye, i.e., the ophthalmic ganglion (o); 

 between o and a are the nerves which go to the peduncle ; <i, nerve sent to the ad- 

 ductor scutoruin ; <> , commissure between the suuni- and infraoesophaseal ganglia (n) ; 

 C, c, c, c, c, C, nerves to each of the eix feet. Enlarged four times. After Kingsley. 



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

 through a morula condition, a suppressed gastrula or two- 

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

 the fact that the free-swimming larva of the Entomostraca 



