AMPHIPODA 291 



about half as long as that of the hand, and has a few unequal spines near its proximal 

 end; the hind margin is a small, rounded, setose lobe. The hand lias its anterior 

 surface furnished with numerous setiferous ridges, the setae very long; this partis 

 produced in a rounded lobe beyond the base of the dactylus. The hind margin is 

 subparallel with the front for about half its length, where it forms a strong tooth* 

 which forms a dee]) V-shaped sinus with the palm. The point of the dactylus just 

 meets that of the tooth (tig. 46. gn. 2 6"). 



The peraeopods resemble those of A. rubricate/,, but are rather more slender. 



The 1st and 2nd uropods have their outer rami subequal to the peduncles, the 

 inner rather longer ; all the parts are spinous. 



The 3rd uropods have the inner ramus slightly longer than and subequal in width 

 to the outer, the end rounded with a group of unequal spines at the end and 4 along 

 the inner margin ; the outer as in A. rubricata. 



Telson as in A. rubricata. 



Length of female with ova, 4 millims. 



This species appears to connect A. rubricata with A. vaillanti, Lucas ; the female 

 agreeing with the former, but differing from the latter in the hand of the 2nd 

 gnathopods, while the reverse is the case in the male. The form described by 

 Della Valle as A. rubricata is, as pointed out by Chevreux (' Amphipodes des 

 campagnes de " rHirondelle,"' 1885-8, p. 100, t who also gives the synonomy of that 

 species), .1. vaillanti. 



The incubatory lamellae of the 2nd gnathopods are narrow ; the branchial pyriform 

 broader at the lower end than in .!. rubricata. 



Amphithoe vaillanti, Lucas. 

 Station LVIII., two females with ova ; length millims. 



Ischyrocerus, Kroyer, 1838. 

 Ischyrocerus anguipes, Kr. (?). 



Coast of Ceylon, under 100 fathoms, exact locality not known. 



One male and 1 female with ova ; length 2 - 5 millims. 



I should not hesitate to refer these specimens to Kkoyer's species were it not for 

 the entire absence of their antennas, their very small size (neither of these characters 

 being, however, of much importance in this genus), and the fact that the species has 

 not been recorded south of the Kattegat. The shape of the hand of the 2nd gnathopods 

 in the male agrees exactly with Sars' figure of ./. anguipes, differing in the concave 

 hind margin from its nearest and more southern ally, /. minutus, LlLLJEBORG. With 

 the latter species I am well acquainted, having formerly described it under the name 

 of Podocerus isopus. 



* In a mule from Station LVI. (tube 43) this tooth becomes a lobe. 

 t " Resultats des Campagnes scientifiques du Prince de Monaco," 1900. 



2 P 2 



