•- 



MONOGRAPH OF 



man and Robertson; and our knowledge of them maybe considered tolerably 



jro<"l. 



8. Hi ii ii Tin, comprising species diffused pretty evenly over the seas of Great Britain 



and Ir land. 



I. Atlantic type, referring to those which attain their greatest luxuriance on the 



south and south-western shores of England and Ireland. 



-. 



Med i to 



including species which attain their maximum of development 



are very imperfectly known, chiefly from specimens 



These 



described by Dr. Baird and myself, and from some further dredgings which have 

 been placed in my hands by M. de Folin of Pauillac, and which I have already 

 partially described in a French publication, 'Les Ponds de la Mer.' 



It will be seen that the above is a very imperfect attempt at typical distribution; but 

 such as it is, it seems to me to be better than none at all, and to add considerably to the 

 interest attaching to the various species. 



For the details of geological distribution, I am indebted much to the works of Prof. 

 T. Ruperl Jones, Bosquet, G. 0. Sars, Keuss, Speyer, and Egger, but chiefly to the large 

 collections of posttertiary species made, in anticipation of a monograph of the subject, 

 by Messrs. Crosskey and Robertson, of Glasgow. 



The following classified Table of the Ostracoda is compiled from various authors, and 



exhibits the present state of our knowledge of the subject. Those marked with an 



isterisk are known only in the fossil state; 



them must be doubtful : — 



whether a right situation is here assigned 



Section Podch opa. 



Family L Cyprid.e 



( teama Cypris. 



Chlamydothcca (?). 

 Cypridopsis. 

 Paracypris. 

 Aglaiat. 



Xotodromas. 

 Candona. 



Pontocypris. 



Argilloccia. 



Bairdia. 



Macrocypris. 



Family 2. Cytherid^ 



Genus Cytherc. 



Limnocytherc. 

 Cythcridea. 



Eucvtli re. 



Class CRUSTACEA. 



Subclass ENTOMOSTRACA 



Order GNATHOSTOMATA. 



Legion Lophyropoda. 

 Tribe Ostracoda. 



Genus Ilyobates. 



Loxoconcha. 

 Xestoleberis. 

 Cytherura. 



Cytheropteron. 

 Bythocythere. 



Pseudocythere. 

 Cytherideis. 



Sclerochilus. 



Paradoxostoma. 



Section Myodocopa. 

 Family 3. Cypridinid^. 



Genus Cypridina. 



Asterope(?). 

 Brady cinetus. 

 Eurypy lus f . 

 Philomedes. 

 Cylindroleberis. 



Genus Cypridella* 



Cyprella*. 

 Entomis*. 



Family 4. Entomoconchidj: 



Genus Entomoconchus*. 



Heterodesmus. 



Family 5. Conchceciad^. 



Genus Conchoecia. 



Halocypris. 



Section Cladocopa. 

 Family 6. Polycopid^. 

 Genus Polycope. 



Section Platycopa. 

 Family 7. CytherellidjE. 

 Genus Cythcrella. 



t Described by the present author in ■ Les Fontls de la Mer.' 



