INVERTEBRATE ANIMALS OF VINEYARD SOUND, ETC. 625 



Pontobdella rap ax Verrill, sp. nov. Plate XVIII, fig. 91. (p. 458.) 



Body, in extension, long and slender, rounded, thickest behind the 

 middle, attenuated anteriorly. Acetabulum nearly circular, not much 

 wider than the body. Head small, obliquely truncated, rounded. Color 

 dark olive, with a row of square or oblong white spots along each side; 

 head and acetabulum whitish, tinged with green. The young are red- 

 dish brown. 



Length, 30 mm to 40 mm ; diameter, 1.5 mm to 2 mm . 



Vineyard Sound, on the ocellated flounder, (Chcenopsetta ocellaris). 



Pontobdella, species undetermined, (p. 458.) 



Body slender, cylindrical, strongly annulated ; the largest seen was 

 about 12 mm long and O.TS 111111 in diameter when extended. Head obliquely 

 campanulate, attached by a narrow pedicel-like neck. Acetabulum 

 oblique, round, only a little wider than the body. Color pale greenish 

 or greenish white, with scattered microscopic specks of blackish. Xo 

 distinct ocelli, but there are several dark stellate pigment-spots on 

 the head, similar to those on the body. Perhaps all the specimens 

 are immature. 



Savin Eock, New Haven, on Mysis Americanus, below low-water 

 mark. 



Myzobdella lugubris Leidy. (p. 458.) 



Proceedings of the Academy of Natural Sciences of Philadelphia, vol. v, p. 243, 

 1851 ; Diesing, op. cit., p. 489. • 



Parasitic on the edible crab (Callinectes hastatus), attached about the 

 bases of the legs. We have not obtained this species on the coast of 

 New England, but it may be expected to occur here. 



Malacobdella obesa Verrill, sp. nov. Plate XVIII, fig. 90. (p. 458.) 



Body stout, broad, thick, convex above, flat below, broadest near the 

 posterior end, narrowing somewhat anteriorly ; the front broadly rounded, 

 with a median vertical slit, in which the mouth is situated. Acetabu- 

 lum large, rounded, about as broad as the body. Intestine convoluted 

 posteriorly, visible throug the integument. Between the intestine and 

 lateral margins, especially posteriorly, the skin is covered with small 

 stellate spots, looking like openings, within and around which are large 

 numbers of small round bodies, like ova. Color yellowish white. 

 Length, 30 lum to 40 mm ; breadth, 12 mm to IS 1 "™ 



Salem, Massachusetts ; Long Island Sound; parasitic in the branchial 

 cavity of the long clam (Mya arenaria). 



Malacobdella mercenaria Verrill, sp. nov. (p. 458.) 



Malacobdella grossa Leidy, Proceedings Academy Natural Sciences of Philadelphia, 

 vol. v, p. 209 (von Blaiuville). 



Body, in extension, elongated, oblong, with nearly parallel sides, or 

 tapering slightly anteriorly; anterior end broad, obtusely rounded, 

 S. Mis. 61 40 



