360 KEV. T. R. E. STEBBING ON NEW SPECIES OF AMPHIPODOUS 



The specific name is given in compliment to John Rattray, Esq., under whose 

 supervision the present collection of Amphipoda was made. 



The only species which make any approach to the peculiar character of the third 

 peraeopods here exhibited are Scina tullhergi (Bovallius) and Scina pacifica (Bovallius), 

 the latter of which may, according to Dr. Bovallius himself, be only a variety of the 

 former. They do not, however, show so great an elongation of the fourth joint in the 

 limbs in question, and they have very different proportions in the fourth perseopods, 

 and exhibit many differences in the uropods. Of the pleopods in the two species above 

 named Bovallius writes that the exterior ramus has seven joints, the interior nine joints. 

 He also assigns fewer joints to the outer than to the inner ramus in the pleopoda of 

 Scina sardi, Scina atlantica, and Scina marginata, giving more to the outer than to the 

 inner only in his species Scina clatisi. In all the species of Scina which I have 

 examined the pleopods have uniformly had the smaller number of joints on the inner, 

 not on the outer ramus. It may be useful to mention that when the pleopod is 

 detached from the animal the presence of the cleft spine on the inner branch distin- 

 guishes it with certainty from the outer. 



Scina concoks, n. sp. (Plate LIII. B.) 



The head is dorsally smooth, truncate between the antennae, this part of the margin 

 not at all concave, but by the rounding of its corners tending rather to become convex. 

 The pera?on is broadly ovate, together with the head equalling in length the pleon to 

 the end of the coalesced segments. These latter, with the fourth pleon-segment, are 

 to"ether scarcely equal to half the length of the first three segments of the pleon. The 

 fifth segment is much broader but not longer than the sixth, which is coalesced with 

 it. The small telson is broader than its length, with the apex truncate, as in Scina 

 acanthodes. The shape and proportions are unusual in this genus, but there is nothing 

 in either case to indicate that the telson is either broken or abnormal. 



The eyes are comparatively large, composed of some nine or more pairs of cones 

 arranged in loose order. 



The first antennae are rather shorter than the perseon, with the first joint of the 

 flao-ellum broad, four-sided, armed below with fourteen teeth, and on the outer margin 

 with ten, the inner densely fringed with cylinders. The short second joint has four 

 cilia on the inner margin, and is tipped with a fine seta not so long as itself. 



The second antennae are set well behind the first on the underside of the head, and 

 have behind them a prominence, apart from which the peduncle is four-jointed, with 

 the third and fourth joints longer than the first and second. The flagellum is of great 

 leno-th, though consisting, perhaps, of not more than eight or nine joints. The first of 

 these is nearly as long as the peduncle, or not quite half the length of the upper 

 antennae ; it narrows from a broad base, and is again a little enlarged apically ; its 

 upper or inner margin is fringed with decurrent cilia. The remaining joints are also 



