4 [No. 8. 



4 succeeding years, and by this proceeding I have been enabled 

 to state a very peculiar and remarkable fact, viz., that these 

 are certain genera of Cyprididse, in which the propagation may 

 be said to be exclusively parthenogenetical, no male intervention 

 being needed either for the development of the summer- or 

 winter-eggs. A similar mode of propagating would also seem to 

 distinguish the European Phyllopode Limnadia lenticularis (Lin): 

 but in all other known Branchiopoda and Copepoda the interven- 

 tion of males is found to be absolutely necessary, at least for 

 the development of the winter-eggs. 



The Ostrocoda have been made the object of special study 

 by several naturalists of the day, especially by Prof. G. S. 

 Brady, who has described, besides the indigenous forms, also 

 numerous exotic species, both freshwater and marine. But in 

 most cases only the shell of the latter has been more closely 

 examined, probably owing to the less perfect state of preserva- 

 tion of the specimens. As regards the forms described in the 

 present paper, I have carefully examined, besides the shell, 

 also the enclosed animal with its several limbs and soft parts, 

 and by this examination have succeeded in pointing out certain 

 anatomical characters which will be of great value in the un- 

 avoidable subdivision of the very extensive old genus Cypris. 



Of the 7 species of Ostracoda described below, I have been 

 enabled to identify 5 with species formerly recorded, partly 

 from India by the late Dr. Baird, partly from Ceylon and Au- 

 stralia by Prof. Brady. The 2 remaining species I regard as 

 new. As to the two species of Diaptomus described at the 

 close of this paper, the one is, I believe, identical with a form 

 recently recorded from Ceylon by Prof. Brady: the other I cannot 

 identify with any species as yet described. 



The plates have been executed with the greatest care in 

 autography, the habitus figures being copied from coloured pencil 

 drawings made from living specimens. The anatomical analyses 

 were in most cases made by dissection of specimens carefully 

 preserved in alcohol. 



