270 CALMAN. 



Epimeral plates of metasome, each with a slight tooth at the 

 posterior lower corner. Eyes small, dark. Superior antennae 

 about half the length of the body ; first joint of peduncle about 

 one and a-half times as long as the head, short at the base and 

 tapering at the tip, where it is armed below with a small 

 spine ; second joint of equal length with the first, much more 

 slender; third joint one-third the length of the second ; flagel- 

 lum about two-thirds the length of the peduncle ; accessory 

 flagellum about as long as the last joint of the peduncle, seven- 

 jointed. Inferior antennae not quite two-thirds the length of 

 the superior ; last joint of peduncle three -fourths the length of 

 the preceding and about equalling the short flagellum. An- 

 terior gnathopods of moderate size ; hand scarcely broader 

 than, and equal in length to the carpus, ovate in form, the 

 palmar edge oblique and not sharply defined. Second gnatho- 

 pods large, merus produced into a sharp tooth at its lower dis- 

 tal corner. Carpus triangular, its distal margin equalling in 

 width the adjacent part of the propodus. Propodus oblong 

 quadrangular, twice as long as broad, anterior and posterior 

 margins slightly curved, palmar edge oblique, irregularly ser- 

 rate, defined by a tooth. Dactyl equalling the palmar edge. 

 Both gnathopods with tufts of long seta^ especially on the mar- 

 gins. Last three pairs of pereiopods with the basal joints ex- 

 panded, ovate, with the posterior edge almost smooth. Last 

 pair of uropods longer than the urosome, rami subequal, more 

 than twice as long as the peduncle. 



Length, 13 mm. 



The only species of amphipod hitherto described from the 

 west coast of North America which appears to resemble the 

 present form is the Mcsra fitsca of Spence Bate (Proc. Zool. 

 Soc. Lond., 1864, p. ^(^j\ The few details given by that 

 writer render the recognition of the species very difficult. It is 

 stated, however, that the palmar edge of the gnathopods is with- 

 out serrations, a character which would seem to distinguish M. 

 fiisca from the present species. Mr. Stebbing has called our 

 attention to several other species not very different in appear- 

 ance from the present. Of these Gainmanis furcicoriiis Dana, 



