362 EEV. T. li. E. STEBBING ON NEW SPECIES OE AMPHIPODOUS 



the ramus, the outer ramus spine-like, but longer than in the first pair, and equal to 

 two-fifths of the inner ramus ; the third pair are serrate on the outer margin of the 

 inner, and the inner of the outer ramus, the latter being two-thirds as long as the 



former. 



The specimen measures a little more than a fifth of an inch, by inclusion of the first 



antennae and the uropods. 



Hahitat. Atlantic. Lat. 4° 26' 7" S., long. 10° V 8" E. Taken in the daytime from 

 a depth of 135 fathoms. 



From the closely allied species, Scina tidlhergi and Scina pacifica of Bovallius, the 

 present is distinguished by shorter fingers to the gnathopods and the first four pairs of 

 perseopods, by a longer sixth joint in the third pair, and especially by differences in the 

 uropods, the outer branch being here longer in the second than in the third pair instead 

 of vice versd., and the outer branch of the third pair being lanceolate and serrate instead 

 of linear and smooth, and also much longer than in the other species. The difference 

 in the shape of the telson might be considered to outweigh all the other distinctions, 

 but its very peculiarity arouses some suspicion that the shape may be accidental. The 

 specific name refers to the near agreement of this with the species reported from Cape 

 Horn and from the Pacific, at Corinto, Nicaragua. 



Scina similis, n. sp. (Plate LIV. A.) 



The head is dorsally smooth, truncate or even slightly convex between the antennae. 

 The length of the head and perteon equals that of the pleon to the tip of the telson. 

 The fifth and sixth segments of the pleon are coalesced. The telson is narrowly 

 triangular, about a third of the length of the peduncle of the third uropods. Tlie 

 ovaries extend backwards to the end of the sixth perseon-segment. 



The eyes appear to be composed of nine ocelli, each ocellus consisting of four cones. 

 In the present condition of the specimen these four cones seem to be encircled by a 

 ring, and are separated one from another by a cross-shaped interval. 



The first antenns are equal in length to the last five segments of the peraeon. Tiie 

 first joint of the fiagellum has seven spiniform processes along the outer margin and a 

 larger number on the inner, over which the long and numerous filaments project. The 

 slender second joint is tipped with a fine seta. 



The gnathopods of both pairs agree closely with those of Scina concors, except that 

 the fingers are proportionally a little longer. 



The first and second peraeopods have the sixth joint longer than the fourth, and 

 nearly as long as the fifth. The finger is slender, curved, not a quarter of the length 

 of the hand. 



The third peraeopods have thirteen teeth on the hind margin of the second joint, its 

 front margin smooth, with an apical tooth a little longer than the third joint. The 

 fourth joint is only a little shorter than the second apart from its apical tooth ; the fifth 



