RESEARCHES IN HELMINTHOLOGY AND PARASITOLOGY. 215 



Kroyer, if it is not identical with it. It is 1.125 mm. long. The 

 cephalothorax is about as wide as it is long, 1.875 mm. ; the first 

 abdominal segment is obcordate 1.5 long and 1.25 wide; and the 

 second long and narrow 1.375 long and 0.375 wide. The cephalic 

 bothria 0.25 diameter. 



[April, 1888. No. 562. See Bibliography.] 



PARASITIC CRUSTACEA. 



Attached to the shark, Odontaspis littoralis, caught at Beesley's 

 Point, New Jersey, above indicated, on each side of the mouth, 

 hanging from the upper lip, were a number of lernean parasites, and 

 these were thickly covered with a hydroid parasite. The lernean 

 appears to be an undescribed species, and may therefore be distin- 

 guished by the following name and characters : 



Lerneonema procera. — Animal pale yellowish. Head horizontal, 

 semi-oval, convex above, with three short, blunt occipital tubercles, 

 fore part convex, excavated beneath and enclosing the mouth, an- 

 tennae, and maxillipeds ; neck long, linear, cylindrical ; body short, 

 fusiform, and truncated behind ; tail longer than the body, linear, 

 cylindrical. Egg pouches long, linear, cylindrical. Length 70 mm. ; 

 including egg pouches, 90 mm. Head 3 mm. long ; neck 30 to 45 

 mm. long, 0.375 thick ; body 10 to 12 mm. long, 1.75 thick ; tail 12 

 to 15 mm. long, 0.5 thick. Egg pouches 20 mm. long, 0.25 thick. 



The hydromedusarium appears to belong to Eucope parasitica, 

 found in the same manner by A Agassiz, in a lernean of Ortha- 

 goriscus mola. Some of the stems rise from the creeping root from 

 5 to 8 millimeters, with short branches, two or three ringed. The 

 polyp-cups are 0.375 mm. long by 0.25 wide. The stems are o.i 

 mm. thick, and the alternate lateral branches about 0.2 long. 



From the fins of a Shark, also caught at Beesley's Point, but the 

 name not ascertained, there was obtained a single specimen of a 

 lernean, w^hich nearly resembles the Perrisopiis dcntatuSy of Steen- 

 strup and Eutken. It is 5 mm. long. The cephalothorax is a little 

 smaller than the abdominal segment, and between them are three 

 pairs of dorsal lobes which completely cover the space. The egg 

 pouches are linear and 0.25 mm. thick. 



[May, 1888. No. 563. See Bibliography.] 



Parasites of the Rock Fish. — Dr. Leidy stated that he recently had 

 examined the gills and entrails of a Rock Fish, Labrax lineatiis, 

 weighing 20 pounds, on which he made the following remarks : 



