o.vMMAUin.i:. 155 



roiiiform. Suponor antenna) scarcely half as long as the animal ; 

 peduncle not so long as the liagclluni ; lhig(>llum minutely articu- 

 lated, articidi as broad again as long, having cilia attached to every 

 other articulus, which is inferiorly and distally minutely pro- 

 duced ; secondary appendage ahnost obsolete, uniarticulate. In- 

 ferior antenna) scai'cely as long as the superior, haxing the 

 peduncle much longer than the peduncle of the superior ; flagelluiu 

 scarcely longer than the last joint of the peduncle. First pair of 

 gnathopoda ha\-ing the carpus attached near the centre of the 

 superior margin of the propodos, and produced along the inferior 

 margin as far as the palm ; propodos subquadi'ate ; palm slightly 

 oblique and a little convex, and defined by a lateral groove near 

 the inferior angle. Second pair like the first, both in form and 

 size. Penultinuite pair of plcopoda shorter than the preceding ; 

 ultimate reaching rather beyond the antepenultimate. TeLson 

 long, narrow, grooved longitudinally, and cleft at the apex. 

 Length li inch. 



ILth. Greenland, di-edged in from 50 to 60 fathoms (Holholl) ; and 

 in hit. 66° oU' jS"., long. 68" W., in from 12 to 15 fathoms {CajJtains 

 WarJiam and Harrison). 



The yonng, when it has just quitted the care of the parent, is 

 about -^ths of an inch long, and differs from the adult in having 

 the antennre much shorter, each articulus of the fiagcUa being longer 

 than broad, — in the carpi of the gnathopoda not being produced 

 along the inferior margins of the propoda (a rudimentary tubercle 

 alone representing the position of the process), — and in the dactylu 

 of the pereiopuda being proportionately larger and stronger. 



2. Eusirus Helvetiae, n. s. (Plate XXIX. fig. 1.) B.il. 



Superior antenna) having the fii'st joint of the peduncle much longer 

 than the second; flagellum as long again as the peduncle, articuli 

 nearly as long as broad, and furnished with cilia upon the inferior 

 distal extremities ; secondary appendage inappreciable. Inferior 

 antenna) nearly as long as the superior ; peduncle reaching but a 

 little way beyond the peduncle of the superior. First pair of 

 gnathopoda having the carpus extending nearly to the inferior 

 angle of the palm ; propodos imperfectly lozcngc-shaped ; palm 

 oblique, slightly convex, fringed with a row of soUtary cilia. 



The remaining portion of the animal from which this description 

 is taken is imperfect. 



The length of the animal can only be apjiroximatcly guossi'd at 

 as about \ of an inch, but the fragment appears to be that of a ma- 

 ture animal. 



JT,(h. ]{antf(J/r. Edward). 



