REPORT ON THE AMPHIPODA. 



1597 



it is in the present species, and as Streets states it to be in his Leptocotis spinifera, 

 since regarded as a synonym of Claus' species. Streets also says that the inferior 

 margins of the first three segments of the pleon are finely serrated, and they are so in 

 the present species. Claus says that the coalesced fifth and sixth segments are three to 

 four times as long as the telson, here they are little more than twice as long ; the 

 peduncles of the first and second uropods, he says, are four to five times as long as the 

 rami, while here they are only a little more than twice as long. Of the diminutive 

 inner ramus to the first, and diminutive outer ramus to the third, uropods, neither Claus 

 nor Streets make any mention. The character of the afterpart of the pleon brings the 

 species near to Bovallius' species, but in that the second gnathopods as well as the first 

 are said to be subcheliform, whereas in our species the second pair deserve to be called 

 chelate ; again Bovallius states that the fifth perseopods are in his species a little shorter 

 than the first joint of the fourth pair, a description which would not naturally be 

 applied to the very short fifth perasopods of the present species, in which the first joint 

 is as broad as long, considerably less than half as long as that of the preceding pair, 

 but much longer than the upturned remaining joints. Streets says in the description 

 of Leptocotis spinifera, "the last pair of legs diminutive, not half as long as the basal 

 joint of the preceding," but he is perhaps only taking into account the first joint, not 

 considering what the total length of the limb would be with the remaining joints 

 outstretched. 



Claus' species was taken in the Gilolo-Passage ; Streets' specimen in the " North 

 Pacific Ocean. Latitude 29° north ; longitude 157° west ; " Bovallius' species was taken 

 in " tropical parts of Atlantic." It is possible that, notwithstanding some differences 

 in the specimens and descriptions, Leptocotis tenuirostris, Leptocotis spinifera, Lepto- 

 cotis Jindstromi, and Leptocotis ambobus may be the synonyms of a single species, but 

 this must be left for future research to decide. 



A plate with the signature " R. v. W. del" contained the figures here reproduced on 

 i smaller scale: — 



Fig. 31. 



