studies on marine Oslracods 



Sll 



words in the groups identical with Cypridina (sensu MDlleri) the c-bristle of the male first 

 antenna has two filaments with small suctorial organs distally, while in the sub-genus Cypridina 

 (sensu meo), i. e. Pyrocypris, this bristle has only one such filament. With regard to the latter 

 character I only wish to point out that, at least in some species, six bristles are to be found 

 on the endopodite of the second antenna in this sub-genus. 

 Fifteen species of this sub-genus are known so far. 



In passing I may make a contribution to the synonymy of a species belonging to this 

 sub-genus. 



In G. S. Brady's work of 1902 a we find on p. 186 that C. (Cypridina) Chierchiae (G. W. 

 MtJLLER) was caught in the ,,Bay of Bengal" by the ,,G a 1 a t h e a" expedition. The specimens 

 on which this statement is based are preserved in the Zoological Museum of the University of 

 Copenhagen and have been re-examined by me. The following facts are the results of this 

 investigation : 



Firstly the locale stated by G. S. BRADY is a little incorrect. The correct habitat is lat. 

 60 22' N., long. 750.54' E., i. e. somewhat S. W. of Cape Comorin in India. 



Secondly I discovered that Brady's identification is incorrect. The characters in the 

 „G a 1 a t h e a" specimens that do not agree with the information given by G. W. MCller 

 for C. (C.) Chierchiae are as follows: 



Shell: The anterior part of the ventral margin, behind the rostral incisur, has from 

 ten to twelve bristles. 



Second antenna: The endopodite has six bristles. 



Mandible: The longest of the (four) ventral bristles of the first endopodite joint 

 is rather considerably longer than the others (it is about the same length as in C. (C.) 

 serrata affirmans, cf. below). 



The seventh limb has six distal bristles, three on each side. 

 All the limbs are without pigmentation except the left first antenna. 

 (It is, however, not impossible that a number of these differences are only apparent, 

 as G. W. MtlLLER's description of C. (C.) Chierchiae is very deficient.) 



To which species do these specimens belong? — I do not consider it convenient to express 

 an opinion on this question. In any case the answer would be very uncertain, partly on 

 account of the very damaged condition of the specimens in question, partly and not least on 

 account of the deficiencies in most of the descriptions of species belonging to this sub-genus. 



Xiimher of species, 



A contribution to Ih 

 synonymy of 

 C. Chierchiae. 



Cypridina serrata (G. W. MCller) var. affirmans n. var. 



Description: — ]\I a 1 e : — 



Shell: — Length, 1,7 — 1,75 mm. Length : height, about 1,!) to 1. Seen from 

 the side (fig. 1) it is of about tlie same shape as that of the type species, but the ventral 

 margin seems to be somewhat more boldly arched. (The shells investigated by me were all soft 

 and consequently their shape was somewhat uncertain.) Tlie surface of the shell 



