56 MARINE INVERTEBRATA OF GRAND MANAN. 



subpediform. Legs of the first pair subchelate, very thick and strong throughout 

 their length, in the male; those of the second pair plumose, without hands, but 

 minutely unguiculate; those of the third and fourth pairs small, slender, and 

 tapering, with the last three articles forming a kind of hooked finger, but with no 

 dilated hand; posterior three pairs strongly unguiculate; those of the last pair 

 much the longest. Caudal stylets all biramous, those of the first two pairs with a 

 strong spine projecting from the inferior apex of the peduncle, along with the rami. 



This genus resembles in most characters Leptoclnrus, Zaddach, and may perhaps 

 prove the same; that name, however, is preoccupied in insects. It has relations 

 with the Rtntoporince in its plumose hairs, and somewhat in the structure of the 

 legs of the third and fourth pairs; while it also approaches those genera of the 

 QammarincB which recall the Corophidce. 



P. PINGUIS, St., n. s. Male, robust, very broad anteriorly, narrowing posteriorly; 

 head large, equalling in length that of the first thoracic segment, and bearing the 

 reniform black eyes at the anterior angles, between the bases of the superior and 

 those of the inferior antennae. First thoracic segment equalling in length that of 

 the second and third together; third abdominal segment also very large, nearly 

 equalling the first and second together. Epimera very strong; the first large, sub- 

 rhomboidal; the second much the largest, projecting downward, and furrowed along 

 the middle; the fifth very small. Superior antennas in length about half that of 

 the body, terminating in long filiform flagella, with a minute appendicular branch; 

 inferior ones as long as the superior, and strongly subpediform. Legs of the first 

 pair very thick throughout their length, with a very short, subquadrate hand, and 

 curved finger. Those of the second pair elongated, covered with long plumose 

 hairs, and terminating in an exceedingly minute, slender, unguiform article. Legs 

 of the posterior pairs with well-expanded femora. Caudal stylets very spiny above, 

 those of the last pair short. Female, with the superior antennas longer than the 

 inferior ones ; the head equalling in length that of the first two segments, which 

 equal each other, together. Epimera of the first pair very small, subtriangular; those 

 of the second pair without groove, and not projecting beyond the others, though 

 still the largest. This results from the smaller size of the legs of the first pair, 

 which are much more slender, and those of the second pair proportionally more 

 elongated, than in the male. 



The color is dark grayish, on all the segments, epimera, and femora, except at 

 their margins. Antennae and legs white. The dimensions of a large male are : 

 Length, 0.64 inch ; breadth, 0.18 in.; height at the third thoracic segment (epi- 

 mera included), 0.2 in. ; length of a leg of the first pair, 0.21 in. ; one of the seventh 

 pair, 0.37 in.; distance between the centres of the eyes, 0.06. This species is 

 abundant on the whole coast of New England, as well as at Grand Man an. It is 

 most abundant on sandy bottoms in the laminarian zone ; although sometimes 

 occurring at low-water mark, as at Fisher's Cove ; or in the coralline zone, as in 

 twenty-five fathoms, off Duck Island. 



