AMPHIPODA OF SOUTHERN NEW ENGLAND. 



497 



gin furnished with several tufts of setae, in each of which is one nr more very thick piumose seta? and 

 several more slender simple ones; hand oblong, narrow, narrowing somewhat toward base; palm 

 oblique, nearly straight, with a row of three spines on outer margin around distal end; an oblique row 

 of two or three spines i in inner surface of hand near distal end of palm; several gnathopods with carpus 

 narrowly triangular, not truncated at posterior inferior angle, posterior margin with about eight trans- 

 verse rows of stout plumose setse; lower margin with a E< w simple setse; hand oblong, palm oblique, a 

 row of three or four spines on both inner and outer surfaces of hand neardistal end of palm; dorsal side 

 of abdomen more or less protruding, especially in older specimens, at posterior cud of third and fourth 

 segments; fourth segment indented slightly near base; lirst two uropods with ■niter rami markedly 

 shorter than inner; peduncle of lirst slender, longer than inner ramus, armed with about eight spines 

 on inner margin and many more smaller spines on outer; both margins of both rami with numerous 

 short spines; a cluster of large spines at tip of each ramus; peduncle of second uropods shorter than 

 inner ramus, with five to seven spines on outer margin and about four on inner; rami much as in first 



Pontogeneia inermis. Grand Manan. 



pair, but with much fewer marginal spines; third uropods extending beyond second, rami flattened 

 lanceolate, the inner somewhat longer and broader at base than outer one and about twice length of 

 peduncle; both margins of both rami furnished with numerous spines and plumose set;e; telson cleft 

 nearly to base, the lobes subacute. 



Nearly colorless, with scattered spots of purplish; antenna; with a few transverse purplish bars. 

 Eyes reddish or reddish brown. 



Length, 11 mm. 



Vineyard Sound (Smith); Grand Manan (Stimpson); Halifax; Bay of Fundy to Greenland (Smith); 

 Arctic Ocean; Norway (Sars). 



Found commonly in tide pools and often taken at the surface. It is often associated with Calliopm 

 luriiisrnhis. 



The antenn;e of the males of this species are provided with a number of very large calceoli. These 

 organs occur on the peduncles of both pairs of antenna-, but are absent in the flagella. In several 

 specimens examined there were 5-7 calceoli on the lower side of the second joint of the peduncle of 

 the first antenme and four or five on the lower side of the third joint. On the second antenna' the 

 calceoli are on the upper inner margin of the last two basal joints. In the specimens examined the 

 penultimate basal joint carried 7-8 calceoli, and the last basal joint 6 or 7. I have found no calceoli 

 upon the antenna; of the females. These organs are very large ami conspicuous, and are in the shape 

 of an urn with a very wide and flaring mouth. Each is situated upon a prominence to which it is 

 united by a short stalk. Both the outer and inner surfaces of these organs are beautifully striated. 



