studies oil marine Ostracods 703 



figure the postero-dorsal corner of the shell is pointed, in mine it is rounded; cf. in addition the 

 proportions of the lengths of the end claws in C. Claus, 1874 b, pi. II, fig. 15 with the infor- 

 mation given by me above. 



It seems to me very probable that G. O. Sars's species C. pellucida, 1887, is identical 

 with the form described by me above. This identification is, however, not quite certain, as the 

 original description of this species is unfortunately too incomplete to permit of a quite certain 

 identification*. Among the facts that seem to me specially to support this identification the 

 following may be mentioned: Length of shell : o = 1,15 mm.; ? = 1,25 mm. E-bristle on the 

 male first antenna: In pi. XIII, fig. 2 a ten pairs of spines are drawn on this bristle. (The 

 equipment of the b-bristle on the first endopodite joint of the male second antenna is uncertain.) 

 — C. Claus put forward as early as in his treatise of 1888 (p. 153) the assumption that this 

 species of G. O. Sars's might possibly prove to be identical witli C. spinirostris. In his work 

 of 1890 this author writes (p. 7) these two names as certain synonyms; this procedure has since 

 been followed by almost all subsequent writers. 



The certainty of the identification of C. spinirostris. C. Clals, 1890 and 1891 a with the 

 species described by me above may be taken as being complete. The following characters may 

 be specially mentioned: Length of shell: S = ,, circa 1,1 mm.'"; $ = ,, circa 1.25 mm." With 

 regard to the e-bristle on the male first antenna this author writes, 1891 a, p. 56: ,,mit nur 

 8 bis 10 Hakchenpaaren besitzt, auf welche noch vereinzelte, unregelmiiUig gestellte Haken- 

 spitzen in weitem iVbstande folgen**". According to pi. I, fig. 6, 1891 a. the b-bristle on the 

 endopodite of the male second antenna has only two long hairs. 



It may also be said that there is full certainty with regard to the identification of C. 

 spinirostris, G. W. MUller, 1894 with the species dealt with above. The following information 

 with regard to the characters just mentioned is given in the work quoted: Length of shell: <? = 

 1,0 — 1,1 mm.; $ = 1,1 — 1,18 mm. Male first antenna: We read about the equipment of the 

 e-bristle: ,,Bis zum 11. oder 12. folgen sich die Haken in kurzer Entfernung, stehen paarweis, 

 dann riicken sie weiter und weiter auseinander imd stehen einzeln, um sich schlielMich wieder 

 rascher zu folgen. Nach dem 11. Hakenpaare kommen noch ctwa 12 Borstenhaken, die zum 

 Theil schwer zu erkennen sind." The b-bristle on the first endopodite joint of the male second 

 antenna is furnished with two long hairs. 



I have also included without hesitation C. spinirostris, G. S. Bradv and A. 31. NC)RMAN, 

 1896 in the list of synonyms given above. With regard to the e-bristle on the male first antenna 

 we read as follows in the treatise mentioned: ,,. . . . having only eight or ten pairs of hooked 

 marginal appendages following which, but separated by wide intervals, are some hook-like 

 processes of irregular size." The length of the shell and the b-bristle on the endopodite of the 

 male second antenna ai-e not mentioned in this work. 



The synonymization of C. spinirostris, G. S. BRADY, 1902 a with this species is based 



on a re-examination of this writer's original material. It is to be noted that this synonymization 



* According to a communication I received from lliis writer the original material of Ihis species lias unfortunately 

 been lost. 



** In the figure with which C. Ct-vus illustrates this description, pi. 1, fig. 'i, this bristle is. however, armed 

 with fourteen ,, Hakchenpaaren", proximally of which there are no spines at all. 



