Kev. A. M. Norman on new Crustacea Arrvphipoda. 413 



The antennae present a very unusual appearance^ from their 

 peculiar nakedness and smooth rounded contour ; there is not 

 a single spine upon any part, and the peduncles have but very 

 few, minute, scarcely noticeable cilia. First gnathopods having 

 the wrist long and slender, gradually (but only slightly) taper- 

 ing from the base to the distal extremity ; hand very narrow, 

 not subchelate, no palm ; finger half as long as hand, nearly 

 straight, with a spine on the inner margin at half its length ; 

 posterior margin of wrist and hand setose. Second gnathopods 

 almost exactly like the first ; but the margin of wrist and hand 

 is more sparingly setose, and the whole form rather more 

 slender. Last joereiopods short and stout 5 thigh much ex- 

 panded posteally ; both wrist and hand shorter than the pre- 

 ceding joint (metacarpus) ; nail strong, short, very thick at 

 the base. Pleon having distal margins of first three segments 

 serrate (teeth about ten) ; fourth, fifth, and sixth segments 

 produced posteally into a single spear-like process, that of the 

 fifth segment of immense size. Telson squamiform, of great 

 size, equalling the three preceding segments in length. First 

 uropods longer than the second, and reaching to the middle of 

 the rami of the last ; last uropods slightly extending beyond 

 the telson, consisting of a short flattened peduncle and two 

 flattened blades of equal length. Length a little more than a 

 fourth of an inch. Colour reddish j antennse banded with 

 brown ; eyes blood-red. 



This is a very remarkable genus, on account of the charac- 

 ter of the eyes, the peculiar naked appearance of the antennae, 

 and the structure of the pleon and its appendages. 



The type specimen was sent to me by Mr. Dawson, who 

 di'edged it, in 1865, ofl" the Aberdeenshire coast. 



My "only specimen is mounted for the microscope, and I 

 am prevented obtaining a dorsal view of the telson, which 

 may or may not be cleft. 



NiciPPE, Bruzelius. 



Body rather stout ; coxse moderately deep. Antennce slender, 

 the upper with secondary appendage. Mandibles dissimilar, 

 furnished with three-jointed palps — the one having an accessory 

 process or internal branch, the other without it. Palp of first 

 maxillcB two-jointed. MaxilUpedes having the laminae small, 

 and the palp four-jointed. Both pair of gnathopods subche- 

 late. Last three pairs of pereioyods gradually increasing in 

 length. Last uropods two-branched, both branches composed 

 of one joint only. 



