REPORT ON THE AMPHIPODA. 691 



Socarnoides hergueleni, n. sp. (PL XXV.). 



A compact species with all the side-plates and the coxos of the last three pairs of 

 perseopods well developed, but the terminal joints of the legs and the uropods of small 

 size. Scattered hairs rise along the back from the head, the perteon and the three large 

 anterior segments of the pleon. Eostrum obsolete ; lateral angles of the head rounded, 

 projecting. Third segment of pleon with lower hinder angles rounded. 



Eyes large, reniform ; crystal cones short, some sixty or seventy in number. 

 Upper Antennae. — First joint tumid, longer than the two following joints of peduncle 

 combined, carrying several feathered cilia on the convex upper margin ; third joint 

 scarcely if at all shorter than second, both narrowing distally ; flagellum of eight joints, 

 first shorter and much thinner than third joint of peduncle, as long as three that follow, 

 but these and the remaining joints are quite small. They carry filamentary cylinders 

 and cilia. The slender secondar}- flagellum of four joints is nearly as long as the first 

 four joints of the primary, its first joint shorter than that of the primary, and its fourth 

 joint minute. 



Loiver Antennse. — Slender, first three joints very short, the fourth a little widened 

 distally, as long as the fifth of the peduncle and the first of the flagellum together ; 

 flagellum tapering, consisting of seven joints, the first as long as the second and third 

 united ; the seventh minute. 



Epistome prominent, the lower part drawn down into a sharp point in front of the 

 furred and rounded distal border of the Upper Lip. 



Mandibles narrow and elongated ; cutting edge with a small tooth at the top ; 

 secondary plate of the left mandible linear, perhaps distally dentate ; spine-row of three 

 short curved spines ; molar tubercle little prominent, with no show of teeth but bordered 

 with short cilia. The articular condyle projects forward above the space between the spine- 

 row and the molar tubercle. The palp is shorter than the trunk of the mandible, inserted 

 far behind the molar tubercle ; the first joint short, the third curved, shorter than the 

 second ; there are two small setae at the apex of the third, and two near the distal end of 

 the second. The third joint of the palp was accidentally missing in the specimen from 

 which the figures m.in. were di-awn. 



Lower Lip prominently ciliated round the free borders except on the narrow man- 

 dibular processes, which have but few cilia. The cilia are crowded on the narrow distal 

 portion of the front lobes ; centrally these latter are wider in proportion than represented 

 in the figure, the delicate texture and the structure of the organ making it diflicult to 

 flatten it out for drawing under the microscope. It should be remembered that the lips 

 and maxillipeds in situ are often far from being the flattened objects to which it is 

 necessary to reduce them in mounted preparations for drawing the details under high 

 powers. 



