REPOKT ON THE AMPHIPODA. 1103 



smooth margins, a slender spine near the apex behind ; the third joint longer than the 

 fourth, these and the fifth and sixth being, as it were, reversed, the hind margin of the 

 third and fourth nearly straight, each with strong spines at two points, the third with 

 slender spines at two points in front, the fourth with spines at the apex of its convex 

 front margin ; the fifth with strong spines at four points of the straight hind margin and 

 slender ones at four points of the convex front ; the finger short, strongly bent, with a 

 <'ilium at the base of the sharp nail. 



Pleopods. — The pair examined resembling those of Gammaropsis afra. 



Uropods and Telson in very close agreement with those of the species just named, 

 yet not without minute differences, such as that the spines on the telson are not at the 

 outer corners of the apical triangle, but further in upon the surface. 



Length. — The specimen, in the position figured, measured, in a straight line from the 

 rostrum to the extremity of the uropods. three-tenths of an inch. 



Locality. — Oil* St. Vincent, Cape Verde Islands. One specimen, female. 



Remark. — The specific name refers to the habitat. 



Gammaropsis thomsoni, n. sp. (PI. CXV.). 



Rostrum scarcely perceptible, lateral lobes narrow, almost angular, with the lower 

 margin long, convex at first ; the postero-lateral angles of the third pleon-segment 

 forming a little slightly upturned point, which does not project beyond the lower lobe 

 of the hind margin ; the corresponding points on the first and second segments are 

 minute ; the fourth segment has a small dorsal tooth in the centre of a postero-dorsal 

 emargination, which is flanked by sharp points and has a seta or spine in each angle ; the 

 fifth segment has a similar emargination with the spines, but without the central tooth ; 

 the sixth segment is provided on either side of the telson with one or two short apical 

 spines. 



The Eyes are comparatively large, with numerous ocelli, closely fitted to the margin 

 of the lateral lobes. 



Upper Antennas. — First joint rather long and thick, with some slightly feathered 

 seta? on the lower margin and a spine at its apex ; the remainder missing. 



Lower Antennas. — First and second joints short, gland-cone small, decurrent, acute 

 at the tip ; third joint longer than the preceding two united, with several spines, some 

 of them long, setiform, and slightly feathered, on the lower margin and apex, and with 

 two or three short spines on the upper margin. The remainder missing, but a detached 

 joint, which probably is the fourth of the lower antennae, is long, slightly curved, 

 narrower at the base than elsewhere, and fringed with numerous spines, some of which 

 arc of great length. 



