520 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



Description. — Rather slender, with the cephalo-thorax a little nar- 

 rower in front than the rest of the body. Carapace of medium length, 

 exposing only the dorsal portion of the last thoracic segment. Rostrum 

 lamellar, quadrangular, with the anterolateral angles rounded, about 

 as broad as long, reaching half the length of the ocular peduncles. 

 Eyes not large, hemispherical ; peduncles clavate, stout. Peduncle of 

 the antennule about one-third of tbe length of the carapace, bearing two 

 flagella, about equal to the carapace in length. Antennal scale sharply 

 lanceolate, abont as long as the carapace, bearing setaj on both edges, 

 and armed at the tip with a sharp spine. Antenna3 about as long as the 

 body. Legs medium, with tarsi of eight or nine joints. Telson about 

 half the length of the cephalo-thorax, lanceolate, channeled deeply above 

 for its whole length, with apex truncated, entire, and fringed with short 

 stout setse. Uropods long, with the inner lamella as long as the telson, | 

 and the outer more than twice as long. Transparent, with a few arbo- 

 rescent black i)igment spots. Length, between GO and 65™"". 



Locality, Point Barrow, near the station, in about 5 fathoms. Abun- 

 dant. 



Museum Nos., 7881, 7892. 



The species is respectfully dedicated to Lieutenant Ray, who was 

 superintending the dredging at the time it was taken. 



Amphipoda. 



3. Acanthozone polyacantha, u.sp. 

 Description. — Head rounded, with a very short, sharp rostrum ond a 



small lateral spine at the base of the lower antenna). Eyes round and 

 prominent. Posterior edge of first five segments of pereion raised into 

 a rounded ridge, developing into a median tooth on the fifth segment. 

 Anterior edge of first segment also raised into a similar ridge, curving 

 forward over the head. Last two segments of pereion and first four of 

 pleon armed on the posterior edge with a large broad median tooth 

 pointing backwards, largest on the third segment of the pleon, and very 

 small, almost obsolete on the fourth. The last two segments of the 

 pereion and the first two of the pleon also carry a small accessory tooth 

 midway between the median tooth and the epimeral suture. The epi- 

 meral suture bears a deep lateral keel, which becomes a sharp, posterior, 

 backward pointing tooth on the last two segments of the pereion and 

 the first four of the pleon. The infero posterior angle of the epimeron 

 bears a spine (there are two on the second segment of the pleon ), Upper 

 antennte about two-thirds the length of the lower. Gnathopods slender, 

 subchelate. Telson rather long, entire. 



Locality, Point Franklin, 13J fathoms, August 31, 1883. Scarce. 



Museum No., 7898. 



4. Melita formosa, n. sp. 

 This species is very close to 31. obtusata, but may be distinguished by 



the shape of the nail of the second gnathopods. 



