346 PROF. T. E. JOl^TES O^ THE OSTEACODA 



quite so nearh* oblong in outline, being somewhat narrowed in 

 front. 



Metam^pris Forhesii comes from Durlston Bay (specimens Xb^, 

 M.P.G.) : from Eidgway (Xb4, M.P.G.). and Xo. 123A, Eidgway, 

 also Xo. 61, Mewps Bay. All these are from the Middle Purbeck. 



lY. Genus DAETrrs^rLA. 



[Xote bv G. S. Beabt, M.D., F.E.S., F.L.S., and D. Eobeeiso^, 

 r.L.S., F.G.S., June 12, 1885. 



" Prof, T. Eupert Jones having kindly drawn our attention to the 

 fact that the generic term Darwinella had already been appropriated 

 by Fritz MiiUer, in 1865, for a genus of horny sponges (Schulze's 

 Archiv fiir mikr. Anat. vol. i. p. 344), and Danvinula having been 

 suggested as appropriate, we are glad to have the opportunity of 

 adopting this suggestion and substituting the latter term."] 



Polyclules, G. S. Brady, Xature, March 10, 1870, p. 484. 



I*olycheles, G. S. Brady and D. Eobertson, 1870, Ann. & Mag. 

 Xat. Hist. ser. 4, vol. vi. July 1870, p. 25. 



Darwinella, Brady and Eobertson, 1872, Ann. & Mag. Xat. Hist, 

 ser. 4, vol. ix. p. 50, note ; and vol. xiii. 1874, p. 117 ; and Monogr. 

 Post-tertiary Entom., Pal. Soc. 1874, pp. 112, 140. 



Carapace smooth, sub cylindrical, elongate, oblong- ovate, or sub- 

 cuneate ; valves thin and smooth, unequal, right larger than the 

 left valve. 



Only one recent species {D. Stevensoni, B. and E., locc. citt.) is 

 known. It belongs to the brackish waters of tidal rivers. This or a 

 verj- similar species has been found in the Forest-bed series of 

 Suffolk by Mr. Clement Eeid, F.G.S., of the Geological Survey. 



9. Daewesttla LE&rMxx£LLA, Forbcs. (PI. TUT. figs, 30 and 31.) 



Cyjyris ohlonga (?), Dunker, Monogr. nordd. Weald.-Bild. 1846, 

 p. 60, pi. 13. fig. 24. 



Cypris leguminelloides. Forbes, MS. July 18, 1851. 



Cypris leguminella, Forbes, MS. Julv 23, 1854; Forbes, in 

 LyeU's Manual of Elem. Geol. 5th edit. 1855. p. 294, fig. 334 c ; 

 Elements Geol. 6th edit. 1865, p, 378, fig, 368 c. 



Cypridea obhnga ?, Jones, Monogr. Foss. Esther. 1862, p. 128, 

 pi. 5. fig. 31 (and'33?). 



Cypndea leguminella, H. Woodward, Cat. Brit. Foss. Crust. 

 1877, p. 89. 



Length | millim. 



Yalves small, smooth, shining, elongate, with rounded ends, one 

 (anterior) narrower, more ellipticaUy curved, and more compressed 

 than the other ; the left valve the largest. Carapace subcylindrical, 

 tapering anteriorly, blunter behind. 



This is very much like the Carboniferous DarvAnula herniciana, 

 Jones, ' Proceed. Berwicksh. Xat. Club,' vol. x. 1884, p. 325, pi. 2, 

 fig, 4 ; but it is not so truncate posteriorly, and is slightly more 



