HYPKRIUJJ, ;^(J7 



Second pair of gnathopoda having the carpus infcriorly produced 

 in a straight line to half the lengtli of the propudos, inf(>rior mar- 

 gin smooth ; propodos straight, sliglitly narrowing distally, inferior 

 margin serrated, the serraturcs increasing in depth anteriorly ; 

 dactylos stout, sharj). Fii-st pair of perciopoda twice the length of 

 the gnathopoda, ha\'ing the carpus broad, ■«'ith the infero- anterior 

 margin oblique and serrated ; propodos not longer than the car- 

 pus, having the inferior margin serrated, and capable of being 

 inflected against the carpus ; dactylos subulate, serrated on the 

 posterior margin towards the articular extremity. Second pair of 

 pereiopoda uniform -with the fii'st : third pair considerably longer, 

 ha^'ing the basos cUlated, the meros and car^ius subequal, — tlio 

 meros with the anterior margin fringed with a few distant hairs, 

 the carpus with the anterior margin fiuTiished with a row of close 

 cilia of equal length and a few distant hairs, infero-anterior mar- 

 gin oblique ; propodos slightly arcuate, margins parallel, anterior 

 serrated and furnished with a few distant hairs ; dactylos slender, 

 smooth, shai-ji : the fourth pair resemble the tlurd, except that they 

 are slightly longer: fifth pair rudimentary, not reaching beyond 

 the distal extremity of the basos of the fom-th pair ; basos broadly 

 dilated, posteriorly emarginate ; dactylos as long as the propodos, 

 terminating obtusely, being as broad as at the base. Ultimate j^air 

 of pleopoda having the peduncle nearly five timas as long as the 

 telson ; rami about half as long as the peduncle, having the inner 

 branch coarsely, and the outer minutely serrated upon the inner 

 side, except towards the extremity, where it is more coarsely 

 serrated on each margin : penultimate pair having the peduncle 

 not reaching beyond the last segment of the pleon, whilst the rami 

 reach to the extremitj" of the peduncle of the ultimate pair, the 

 inner branch being coarsely serrated upon the outer and on the 

 distal extremity of the inner margin, and each denticle being mi- 

 nutely serrated along the outer line : antepenultimate pair having 

 the peduncle reaching as far again as that of the penidtimate, the 

 rami reaching beyond the extremity of the peduncle of the ulti- 

 mate, and serrated like those of the penultimate pair. Telson 

 small, lanceolate. 

 Length ^ths of an inch. 



Hah. The Powel Islands {MS. lahel on bottle). 



The animal from which the description and figure are taken is one 

 of the collection entrusted to me, and belonging to the Museum of 

 the Jardin dcs Plantes. It is named in conipliim'ut to M. Lucas, the 

 accomplished naturalist of the expedition to Algeria. 



X 2 



