﻿The Sijmpoda. 161 



The first and second peraeopods are slender and elongate, with the 

 full number of joints, the second joint in each shorter than the rest 

 combined ; among these in the first pair the sixth joint is the longest, 

 while in the second pair it is shorter than any except the third. In 

 the remaining pairs the second joint is longer than the vest of the 

 joints combined. The third and fourth pairs are alike in the two 

 sexes, except for the minuteness of the difficultly discernible two- 

 jointed exopods in the female ; they have the sixth joint set forward 

 on the truncate apex of the fifth, leaving room behind for insertion 

 on that apex of the long spines by which the sixth joint is over- 

 lapped. The minute fifth pair are probably vestigial ; they are 

 pellucid, and the last three joints are microscopic. 



The peduncle of the uropods is a little longer than the endopod, 

 its inner margin carrying numerous spines (9-13), the endopod on 

 inner margin of its three joints having respectively 8-9, 3-4, and 2 

 spines, besides an apical spine. The exopod, which is a little longer 

 than the telson, reaches just beyond the base of the endopod's third 

 joint. 



Length of the specimens about 10 mm. 



Localities. No. 17585, Cape Point E. by N. 29 miles ; 17643, 

 Cape Point N. Sl'^ E. 32 miles. The specimens were sent by 

 Dr. Peringuey, out of respect for whom the species is named. 



"When describing this species and defining the genus, I felt con- 

 vinced that Dr. Caiman's Platyaspis orbicularis (Fisheries, Ireland, 

 Sci. Invest., 1904, I. [1905], p. 42, pi. 5, figs. 77-81) must be con- 

 generic. That species, however, was founded on a specimen which 

 did not extend beyond the first pedigerous segment. But quite 

 recently (Proc. U.S. Nat. Mus., vol. 41, p. 631, figs. 29-39, 1912), 

 with far more advantageous material. Dr. Caiman has given a fresh 

 description with numerous instructive figures, and provisionally 

 transferred his species to the genus Paralamprops. He recognises 

 that it is distinguished from that genus by the possession of a 

 normal palp on the first maxillae, but having only female specimens 

 at his disposal, he could not make use of the further distinguishing 

 character that the male has no pleopods. At least this is the case 

 if the nearly adult South African specimen of the new species may 

 be trusted as establishing that character. The two species of the 

 new genus are well distinguished by differences in the carapace, but 

 in many respects they show very close agreement, and it was not till 

 I had studied Dr. Caiman's account of P. orbicularis that I was 

 able, by renewed investigation, to make out the rudimentary exopods 

 on the third and fourth peraeopods of P. peringueyi in the female. 



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