OP THE PTJEBECK FOEMATION. 347 



acuminate in front. It still more closely resembles the recent 

 D. Stevensonii, B. C. and R. ; and it is possibly identical with fig. 31, 

 pi. 5, of my 'Monogr. Eoss. Estherise,' 1862, Appendix, p. 128, 

 though a little smaller. This last is a small valve from the Wealden 

 of Obernkirchen, Cassel, near Hanover, and was very superficially 

 described, together with other associated fossil valves, in the Ap- 

 pendix referred to. In 1878 (Geol, Mag. dec. 2, vol. v. p. 107) I 

 made some remarks on these specimens. Fig. 30 is probably a 

 Candona ; fig. 31 a Darwinula * (see above) ; fig. 32 is obscure ; fig. 

 33 may be an impaired specimen of Darwinula (?) ; and fig. 34 may 

 be Cyprione ? ohlo7iga (Eomer). 



D. hguminella (E. Eorbes) has been found in the following Upper- 

 Purbeck specimens, 397 A and 397B, Durlston Bay; Xb|- and Brit. 

 Mus. Bacon Hole ; 61, 377, and 378, Mewps Bay. In Middle 

 Purbeck Xb|- & Xb|, Durlston Bay, and 123 A, Ridgway. 



It occurs also in the Wealden Beds, near Atherfi.eld, Sandown, 

 Hastings, Hythe, &c. See pp. 333, 334. 



D. leguminella abounds in some of the Hanoverian black Cypri- 

 diferous Shales from Obernkirchen and the Deister. Some specimens 

 are in the British Museum. Although the description and figures 

 of Cypris ohlonga given by Eomer and Dunker do not fit this 

 species, yet it is possible that they were intended to cover both it 

 and Cyjprione Bristovii ; C. ohlonga (Eomer), however, may be di- 

 stinct. At all events Hunker's fig. 24 well suits a x^iece of shale 

 loaded with little Darivinulce. The species is figured in my ' Monogr. 

 Eoss. Esth.' I. c. from Obernkirchen, Hanover ; fig. 31 is fairly good, 

 and fig. 33 may be imperfect or partly imbedded. 



Y. Genus Ctpeis, Miiller, 1785. 



(See the memoirs on recent Ostracoda, by G. S. Brady and others, 

 to whom he refers, for general and special descriptions.) 



Valves subreniform or suboblong, thin, smooth, pitted or bristly ; 

 hinge simple, or with narrow furrows or flanges and slight ridges. 

 The interiors of the front and hind margins are bevelled, and are 

 sometimes continued into a more or less developed, narrow, laminar, 

 oblique plate. Left valve the largest. 



10. Cypeis PTJEBECKEifsis, Forbcs. (PL IX. figs. 1-6.) 



Cypris purhecJcensis, Eorbes, MS. July 18, 1851 ; MS. July 23, 

 1854. 



Cypris purbechensis, Eorbes, in Lyell's Manual Elem. Geol. 

 5th edit. 1855, p. 297, fig. 339^; Elem. Geol. 6th edit. 1865, 

 p. 387, fig. 375a. 



Cypris purhechensis, Huxley and Etheridge, Catal. Coll. Eoss. 

 Mus. P. Geol. 1865, p. 254. 



Cypris purhechensis^ P. de Loriol et Jaccard, Mem. Soc. Phys. 

 Hist. Nat. Geneve, vol. xviii. part i. 1866, pp. 81, 82, pi. 2. figs. 1-3. 



* Figs. 23 and 24 in the same plate ( Candona ? globosa, from Linksfield) 

 may represent a Darwinula also ; for its lucid spot, of which I have drawings, 

 is that of Darwinula. 



