INVERTEBRATE ANIMALS OF VINEYARD SOUND, ETC. 625 



PoNTOBDELLA RAP AX Yerrill, sp. nov. Plate XVIII, fig. 91. (p. 458.) 



Body, in extension, long and slender, rounded, thickest beliind 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, {CJuvnopaetta ocellaris). 



PoNTOBDELLA, species undetermined, (p. 458.) 



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

 about 12™™ long and 0.'75™™ in diameter when extended. Head obliquely 

 campannlate, 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, l^o 

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

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

 are immature. 



Savin Eock, Xew Haven, on Mysis Americamis, below low-water 

 mark. 



MvzoBDELLA LUGUBRis Leidy. (p. 458.) 



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

 1851 ; Diesing, op. cit., p. 48t). 



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



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



Kew 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 eud, 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 opeuings, 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 {My a arenarki). 



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



Malacobdella grossaLieidy, Proceedings Academy Natural Sciences of Philadeljihia, 

 vol. V, p. 209 {noH Blaiuville). 



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



tapering slightly anteriorly ; anterior eud broad, obtusely rounded, 



S. Mis. 61 40 



