REPORT ON THE AMPHIPODA. 1163 



anteunae protruding. This is represented in the Plate, fig. A, natural size. The case has 

 two or three little warty excrescences of sand upon it, and an empty Globigerina shell. 



Remarks. — The specific name is given in compliment to S. I. Smith, Esq., who has 

 redescribed Cerapus tubularis, Say, in a very important paper. See Note on S. I. Smith, 

 1880 (p. 522). I ought to mention that the separate figures of the gnathopods in the 

 Plate were drawn with the A eye-piece of my microscope, and those of the perseopods 

 with the B eye-piece, so that in these figures the peraeopods are on a larger scale than the 

 gnathopods. 



Cerapus flinder si, n. sp. (PI. CXXV.). 



The Head with a small, sharp, carinate, slightly depressed rostrum ; the lateral lobes 

 of the head well advanced, apically a little rounded, the head emarginate below and a 

 little behind the lobes ; the first two segments of the peraeon very short, together not as 

 long as the head, the next three segments very long, especially the third of them ; the 

 pleon tapering distally, the postero-lateral angles of the third segment acute. 



The Eyes round oval, situate on the lateral lobes, retaining a dark colour in the 

 specimen preserved in spirits. 



Upper Antennas grooved on the under side for the reception of the dilated fourth joint 

 of the lower antenna?. The first joint winged near the base, much longer than the 

 second joint, the upper margin convex, the opposite margin below the wing straight, with 

 four groups of long spines ; the second joint with the margins slightly convex, some 

 spinules on the upper, six groups of long spines on the lower ; the third joint with 

 straight margins, narrower than the second, as long as the first, with spinules above, and 

 on the lower margin two groups of short and seven of long spines ; the flagellum of four 

 joints, the first the longest, the four together equal in length to the third joint of the 

 peduncle, all carrying cylinders and strong denticulate spines. 



Lower Antennas subequal in length to the upper. The first two joints very short, 

 gland-cone very small ; the third joint a little longer than broad, the upper margin 

 convex, some spinules and spines distributed at various points, chiefly on the distal 

 margin ; the fourth joint dilated at the base, abruptly broader than the preceding joint, 

 subequal in length to the third joint of the upper antennae and thicker, with several 

 groups of long spines planted near the upper margin and some groups of spines and 

 some spinules near the lower margin ; the fifth joint longer and more slender, narrowing 

 a little distally, fringed below with several groups of long feathered spines ; the flagellum 

 of four joints, the first the longest, the four together a little longer than the last of the 

 peduncle, all carrying denticulate spines, and the last a very strong one, shorter than the 

 rest, with an almost hooked tip. 



