REPORT ON THE AMPHIPODA. 001 



preceding pair, a little less curved at the tips ; third pair with short peduncles, rami long, 

 broadly lanceolate ; the outer with plumose setse on the inner margin, a spine at each 

 side of the base of the nail, which is pectinate on the inner side ; the inner branch rather 

 the longer, with spines and feathered setfe on both sides, inner margin pectinate, no nail. 



Telson elongate, narrow, reaching far beyond the peduncles of the third uroj)ods, slit 

 nearly three-quarters of its length, not dehiscent except apicaUy, the two halves in the 

 specimen A not quite symmetrical, with three spines on one margin and only two on the 

 other ; eacL half is apically divided, the shorter tooth being on the outside ; a spine is 

 inserted in each cleft. 



Length of specimen A, in curved position, half an inch ; specimen B, in the same 

 position, a little shorter. The details were figured from specimen A. 



Locality. — Station 295, off the west coast of South America, November 5, 1875; 

 lat. 38° 7' S.. long. 94° 4' W.; depth, 1500 fathoms; bottom, Globigerina ooze; bottom 

 temperature, 35°'3. Specimen A ; taken in the tow-net at the trawl. 



Station 335, near Tristan da Cunha, March 6, 1876 ; lat. 32° 24' S., long. 13° 5' W.; 

 depth, 1425 fathoms; bottom, Pteropod ooze; bottom temperature, 37°. Specimen B ; 

 taken with the deep trawl. The specimen as mounted contains several Globigerina. 



Remarks. — Between this species and the type species of the genus, Cyphocaris 

 anonyx, Liitken, as described and figured by Boeck, there are numerous points of close 

 resemblance. Liltken's species was named anonyx obviously on the ground that the 

 second gnathopods were devoid of an unguis or finger. The present species is named 

 micronyx, to point to the fact of the second gnathopods possessing a finger, though a 

 minute one. At the same time it is possible that there is one also in the earlier species, 

 which has been overlooked. Boeck, who gives as part of the generic character, " pedes 2di 

 paris elongati, ungue destituti," only says in the specific account that the finger seems to 

 be absent. In Cyphocaris anonyx, from Greenland, the third and fourth side-plates are 

 said to be coalesced, which is not the case in our species, and the remark that, in the 

 first and second perseopods, " the fifth joint is somewhat thicker towards the end, and 

 is on the inner margin armed with some small spines," is all the notice taken of what, if 

 the species be identical with ours, are the rather remarkable palms on these two and on 

 the two following pairs of perseopods. 



I 



Cyphocaris challengeri, n. sp. (PI. XVII. ). 



Head having a certain amount of play within the first person-segment, the top of 

 the head directed forwards, its anterior margin a little sinuous ; the first periEon-segment 

 about equal to the third and fourth united, the second shortest of all ; the first three of 

 the pleon each longer than first of perseon ; the fourth with a dorsal depression near the 



