138 



THE VOYAGE OF H.M.S. CHALLENGER. 



The head is 4 - 5 mm. long, and the sack-shaped body 9 mm. loug ; the latter shows no trace of 

 segmentation or appendages, with the exception of two furcal processes at the end of the body ; on 

 the summit of each of these are a few bristles. In the interior of the animal can be distinguished a 

 narrow oesophagus (oe) passing into a wide stomach (st), which shortly becomes constricted into an 

 intestine (i) whose walls are clothed with extraordinarily developed longitudinal muscles (m) extending 



Fig. i. — Lerncea parasitic on Ceratias (from a drawing by the late 

 R. v. Willemoes Suhni). 

 oe, oesophagus ; st, stomach ; i, intestine ; m, muscular portion of intestine ; ov, ovary ; 

 v, vulva ; a, anus ; os, ovisac. 



as far as the anus (a); these muscles facilitate the strong sucking movement of the intestinal tract, 

 visible during the life of the animal. In the body cavity are numerous traces of a fat body, and on either 

 side a simple tube-shaped ovary (ov), which opens close to the anus. With this vulva (v) is connected 

 on either side an ovisac (os) containing eggs and large fat globules. 

 The colour during life was reddish-brown. 



My best thanks are due to my friend the Rev. Dr. Norman, for his valuable assistance 

 in the examination and identification of the fish-parasites, and for the opportunity he has 

 kindly afforded me of comparison with specimens in his own collection. 



