492 



BULLETIN OF THE BUREAU OF FISHERIES. 



side upon posterior margin; fourth segment with a small median spine and, as in the fifth segment, 

 with a recurved hunk at the postero-inferior angle; rostrums small; first basal joint of first antennae 

 produced distally into a spine; first three cox al plates acuminate below, first bent forward; fourth with 

 two inferior spinous projections; gnathopods similar, hand long, narrow, with a short, nearly trans- 

 verse palm; basal joints of three posterior perseopods with two large spinous processes on posterior 

 margin; telson narrowly truncated at tip. 



Length, in mm. 



Widely distributed in the Arctic regions; Greenland; Labrador; Grand Manan; Eastport, Me.; 

 off Cape Ann. 



This is one of the most peculiar and striking of the Amphipoda of our coast and is easily distin- 

 guished from all the other forms by the abundance and large size of its spines. 



Lafystius sturionis Kroyer, 



Body robust, depressed; head short and broad, with a broad ami obtuse rostrum; eyes rather 

 small, nearly round, and containing few facets; first antenna? slightly longer and much stouter than 

 the second, less than half the length of the body; the three joints of peduncle of nearly equal length, 

 the second a little the shortest; flagellum seldom longer and often shorter than peduncle and composed 

 of six or seven segments, which are furnished with long olfactory clubs; second antenna' weak, peduncle 



Lafystius sturionis, male. W Is Bole, Mass. 



not much thicker than flagellum, the latter composed of five or six elongate segments; maxillipeds 

 with very narrow inner plates, which bear two or three setse on inner margin and a pair of small seta; 

 at tip; the large outer plate pectinated and furnished with a few large set* distally; the small two- 

 jointed palp not reaching tip of outer plate: thorax tumid, first two segments shorter than others, coxal 

 plates small; first gnathopods small, very slender, simple propodus very narrow, dactyl stylifonn nearly 

 straight and a little irregular in outline; second gnathopods small, joints, except the first, short, hand 

 produced ami rounded at postero-inferior angle, dactyl bifid at tip; perseopods well-developed and of 

 not very unequal length, merus of first and second pairs dilated and produced downward in front; 

 propodus in all per... .pods large and stout, dactyls large, smooth, hook-like: in the first pair the 

 propodus is stouter, and the dactyl stouter and more curved than in succeeding perseopods; uropods 

 armed with very few spines; rami narrow, nearly equal to peduncle in first pair, a little longer than 

 peduncle in second pair, and very much longer than peduncle in third. 



Length. I) nun. 



From the mouth of a goose-fish, Lophius americanus, taken in Vineyard Sound (Smith); "From 

 the hack of a skate {Raia laems) in the Bay of Fundy" (Smith); Halifax, "parasitic on Coitus" 

 ( Stebbing) ; Scandanavian coast i Sar- and others i ; Mediterranean, on Lophius piscatorius, ( I lellaValle); 

 British Isles. 



The above description with the figures accompanying it were taken from specimens obtained from 

 goose-iish taken near Woods Hole. 



