[625] INVERTEBRATE ANIMALS OF VINEYARD SOUND, ETc. 331 
PONTOBDELLA RAPAX 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™™ to 40™™; diameter, 1.5™™ to 2™™, 
Vineyard Sound, on the ocellated flounder, (Chanopsetta ocellaris). 
PONTOBDELLA, species undetermined. (p. 458.) 
Body slender, cylindrical, strongly annulated; the largest seen was 
about 12™™ long and 0.75"™ 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. No 
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 Rock, 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 Verriil, sp.nov. Plate XVIII, fig. 90. (p. 458.) 
Body stout, broad, thick, convex above, flat below, broadest near the 
posterior end, narrowing somewhatanteriorly; 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, locking like openings, within and around which are large 
numbers of small round bodies, like ova. Color yellowish white. 
Length, 30™™ to 40™; breadth, 12"™ to 15™, 
Salem, Massachusetts; Long Island Sound; parasitic in the branchial 
cavity of the long clam (Mya arenaria). 
MALACOBDELLA MERCENARIA Verrill, sp. nov. (p. £58.) | ° 
AMatacobdella grossa Leidy, Proceedings Academy Natural Sciences of Philadelphia, 
vol. v, p. 209 (non Blainville). 
Body, in extension, elongated, oblong, with nearly parallel sides, or 
tapering slightly anteriorly; anterior end broad, obtusely rounded, 
23 V 
