6 



G. O. SAKS. 



[No. S. 



gibbous protuberance. In fact, Mr. Brady would seem to have 

 based his genus more especially on this anomalous character of 

 the shell, having not examined minutely the animal itself. I 

 have succeeded in raising a single specimen of the same species 

 from Australian mud, and on closer examination of this speci- 

 men, I find that in the anatomical details as well as in some 

 of the shell characters this species agrees very closely with 

 another Australian species, in which the above mentioned gibbous 

 protuberance does not at all occur, and hence this character 

 cannot be regarded of generic value. We find however some 

 other characters, common to both species, partly in the struc- 

 ture of the shell, partly in that of the soft parts, which 

 make it most advisable to retain the genus as a natural sub- 

 division of the old genus Cypris, the more so as there are 

 also 2 northern species, viz., Cypris salina Brady and Cypris 

 freiensis Brady, which evidently belong to the same division, 

 and agree in all essential points with the two Australian species. 

 As to the shell, the high, compressed form is characteristic of 

 all 4 species, as also the peculiar crenulation of the right valve. 

 Although the soft parts agree on the whole pretty closely 

 with those of the typical genus Cypris, there are still to be 

 found some minor differences distinguishing the present genus 

 from the other genera. Moreover there is a feature that 

 would seem to separate this genus very markedly from the 

 genus Cypris (sens, strict.) and to bring it in closer relationship 

 to the genus Cyprois of Zencker. As with the latter genus the 

 propagation is sexual and not, as in the true genus Cypris, ex- 

 clusively parthenogenetical, the males being almost as frequent 

 as the females. 



Cypris dmtato-marginata, Baird, Description of some new re- 

 cent Entomostraca from Nagpur collected by the Rev. S. Eislope. 

 Proceed. Zool. Soc. London 1859, p. 233, PI. LXIII, fig. 5, a-f- 



