536 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. XXVIII. 



In the l)ody cavity is a fluid representing- the l)lood which circulates 

 somewliat. On tlie dorsal surface close to the anterior marg-in is the 

 median eye and the first traces of the nerve trang-lion. Both the eye 

 and the dorsal surface of the o-anglion are well pigmented. This 

 ganglion represents practically only the future supra-cesophageal one 

 and the esophagus does not pass through it. The infra-oesophageal 

 portion of the ganglion (see p. 552) appears with the development of 

 the appendages. 



Fig. Hi'i.— Newly hatchkii XAfPLii's of CALiors rapax, pi(;M?:Nr hk kkight rtst color. 



The anterior ])art of the body is transi)arent and through it can-))e 

 seen the muscles ^\ hich inov(^ the appendages. They extend backward 

 obli([U(dy on eitlier side from the l)ases of the appendages to the 

 median line a little back of the center, Thev are faintly striated and 

 very well developed, furnishing powerful motors for swimming. 



The posterior portion of the l)ody, a little less than half, still retains 

 much of the nutritive material from the Qg^^ by means of which the 

 nauplius is to l)e nourished during several moults until it can seek a 

 host and get its own food. These yolk granules make this portion of 

 the body opaque and nothing of the internal structure can be seen 



