On the 'Challenger 1 Amphipoda. 203 



Epicrionops bicolor, sp. n. 



Teeth small ; both rows of mandibular teeth well developed. 

 Snout rounded, scarcely prominent; the width of the head 

 between the eyes does not quite equal the distance of the eye 

 from the end of the snout. Body subcylindrical, slightly de- 

 pressed, with 245 very distinct, complete circular folds. Anal 

 opening longitudinal, elongate. Tail pointed, compressed, as 

 long as the head. Dark brown ; a broad yellow band along 

 each side of the belly, nearly as broad as the interspace, com- 

 mencing from the mouth, uniting in front of the vent, and 

 occupying the lower half of the tail. Total length 225 millim., 

 greatest diameter of body 9 millim. 



In general physiognomy and colour, this highly inter- 

 esting form resembles Ichthyophis glutinosus of the East 

 Indies, from which it is generically distinguished by the 

 structure of the tentacle and the well separated squamosal and 

 parietal bones. It is remarkable in the retention of several of 

 the larval characters of Ichthyophis, viz. the position of the 

 tentacle, the elongate anal cleft, and the relatively long and 

 compressed tail. 



One specimen was collected by Mr. Buckley at Intac, 

 Ecuador. 



The c Challenger ' Amphipoda. By the Rev. 



Thomas R. R. Stebbing. 



The following preliminary descriptions are published u by 

 permission. JT The work of arranging, describing, and figuring 



mean- 



i 



the whole group is likely to take some time, 

 while it may be of interest to students of this branch of 

 natural history to have a brief account of some of the more 

 striking forms that have been discovered. The details now 

 given are intended to afford some notion of the external ap- 

 pearance of the specimens, and to distinguish them from their 

 congeners previously known. There are naturally many 

 points of interest which do not come within the limited scope 

 of this intention. These are reserved for publication in the 

 completed work. In the nomenclature here used the classifi- 

 cation of A. Boeck has been followed. 



Family GammaridaB. 



Subfamily CEdicerin-e. 



Acanthostepheia ornata, n. sp 

 is produced beyond the first y 



14* 



