282 PROCEEDINGS OF THE ACADEMY OF [1800. 



Of other crustacean parasites of the Sun-fish tliere were three. Of 

 these one, Cecrops Latreillii, Leach, was attached to the gills. 

 Six mature females were about an inch in length, and three of them 

 had the male appended, about half the length, and had well-stocked 

 ovaries. Three additional young females were 14 mm. long. 



The other two species were attached to ulcerated surfaces at 

 the root of the caudal fin. One of them, Lcemargus muricatus 

 Kroyer, of which there were four females, were from 15 to 18 mm. 

 long. 



The remaining species, nearly resembling Lcemargus, seems to be 

 the Diiiematura serrnta Kroyer, of which there were three females, 

 from 6 to 7 mm. long. 



Gliding on the skin, at the sides of the body of the fish, was the 

 circular Fluke-worm, Tristovium Budolphianam, of which four 

 ranged from 16 to 20 mm. in breadth. 



In the intestine was another apparently undescribed Fluke-worm, 

 which may be named Distomum pedocotyle. Of three individ- 

 uals one was 20 mm. long by 0"5 mm. thick ; the others were 40 to 

 45 mm. long and 1'5 mm. thick. The body is cylindrical, narroAV- 

 est at the fore part and obtuse behind, with the ventral bothria 

 larger than the mouth and projecting in advance to an extent equal 

 to the body ; with the skin smooth and trans])arent ; the yellow 

 intestine and the white and brown genitals shining through. 



The soft, yellow liver was throughout pervaded with a cestoid 

 worm, Anthoeephalus elongatas Rudolphi. The organ looked 

 like a bundle of tangled cotton cord packed in the hepatic sub- 

 stance. The larger worms were probably upward of several feet in 

 length, but with much effort about a foot and a half of only one in- 

 dividual was disengaged from the liver. In the larger specimens 

 the cystic envelope of the cephalic end appeared as a vesicle from a 

 fourth to half an inch in diameter. When disengaged, the cephalic 

 extremity appeared as a sausage-shaped expansion, from three- 

 fourths to an inch long, within which was the inverted head and 

 neck, from half to three-fourths of an inch long. The head provided 

 with a pair of lateral oblique bothria, enclosed four thread-like 

 proboscides armed with numerous recurved hooks. 



0)1 Helix alholahrls var. marithna. — ^{p.. Pilsbry exhibited speci- 

 mens of Helix collected by Mr. Witmer Stone on the sand hills at 

 Cape May, New Jersey. The shells, he stated, are rather ambiguous 

 in character, but referable to Helix {Mesodon) albolabris as a variety 

 which the speaker proposed to call maritima. The 

 shell is smaller than that of H. albolabris, measur- 

 ing, alt. 13, greater diam. 22, lesser 18] mm. The 

 surface is very distinctly and beautifully decus- 

 sated by spiral and oblique lines. The base is 

 notably sAvollen near the umbilicus back of the lip. The lip is much 

 narrower than in typical albolabris. 



