;50(; TAOR sKor.sr.i:i!('. 



cases two biistk's; at the base of the branch with the peg there are two more bristles situated 

 close together and dorsally, more proximally, on the penis there are two bristles close to each 

 other; all these bristles are short and subequal. 



Furca (fig. 7): — The number of claws is on the average somewhat smaller than 

 in the female, eight to ten were observed; in most cases nine claws were observed on one lamella 

 and ten on the other; other combinations observed were: nine and nine, eight and nine. The 

 anterior claws are somewhat more bent than in the female. The equipment of the claws is rather 

 considerably weaker than in the female; claw no. 2 is furnished with two rows of teeth, the inner 

 one of which is, however, in most cases rather sparse; on the three or four posterior claws there 

 are no long bristles medially-basally. 



Tiu: name. Remarks: — As is seen from the list of synonyms given above this species is known in 



the literatui-e principally under two names, Ph. brenda (W. Baird) and Ph. (jlobusus 

 (W. LiLLJEBORG), the former of which has been used most frequently of late. 



Which of these two names ought really to be used? 



The original description of Ph. brenda, or, as W. Baihd called this species, Cypridina 

 brenda, is to be found in W. Baird's work of 1850 a, p. 181, pi XXIII, figs. 1, a — g. It 

 is quite clear from this description that this form of Baird's cannot be considered identical 

 with the one dealt with above by me. ^^^lether it is identical with any other species now known 

 seems to be impossible to decide with certainty, but it does not seem improbable that it belongs 

 t(j the sub-genus Vargula. It is perhaps identical with C. (V.J megalops G. 0. Sars. As an 

 argument in favour of this statement of mine I may quote and discuss here a number of facts 

 fr'oni Baird's description. 



This author writes: ,,The shell or covering is. oval, rounded at both extremities, rather 

 narrower at the anterior, where it is deeply notched in fr'ont, producing a kind of short 

 beak; .... the valves are smooth and tumid. — The eye is large and ovoid, with about 

 twenty areolae. — ■ The first pair of antennae is divided into five articulations; the first being 

 the largest, and the others graduaUy becoming shorter as they descend, the last sending 

 off four long, plumose filaments. The second parr is curved, and formed of five joints: 

 the basilar being stout and rather short; the second, longer, arched on one side, and j)rovided 

 with three or four long, simple setae; the third is the shortest of all, with a projection on its 

 under edge, which gives off two stout, plumose setae; the fourth, longer and narrower than the 

 preceding, is armed on its outer edge with five simple setae; and the fifth is very slender, and 

 terminated by four short, simple spines. — The natatory feet are large, and like those of preced- 

 ing species „(PIl Mac Andrei)", except that the long filaments are distinctly and beaut ifidly 

 j)lumose, and that there was apparently no appendage attached to the basilar joint." 



The figm-e with which W. Baird illustrates his descriptiijii of the .shell agrees closely 

 with the description. It shows a shell of an egg-shaped type, with its greatest height somewhat 

 behind the middle and the posterior part of the shell clearly larger than tlic anterior part; the 

 dorsal and the ventral margins are boldly, uniformly and almost symmetrically curved; the 

 anterior and tlie posterior maigins well rounded, the rostrum without a decided anterior corner. 



