PLATK XXTX. 



CyPRIM KI;1A {ronl'utucil). 



Pios. 



1 — 3. G. {Ci/iiariyiiKi) jiiirrn (Sow.). IjOwci' Cire(.'ii.><iin(l (Crackers), AlherfiL'kl, 

 except fig. 3. Sedgwick Museum, C'arabritlge. (P. 184.) 



1 ((, k'ft valve; /', anterior view of tlio sauip spoeimeu. 



2. Hinge of left valve x 3. 



3. Pcr)ia-hc(\. East SliaH'cinl. TntiTnal cast of left valve. 



4—0. ('. {Ciirl,in><)ua) rnlnmiujnisi.'^ (d'Orl).). I-, 5, Cliloritic Marl. (P. 18G.) 



4. Woolconibe. Museum of Practical Geology, No. 18735. Kight valve, with 



part of the shell preserved. 



5. Maiden Bradley. Museum of Practical Geology, No. 1874G. n, int<'rnal 



east of right valve; li, dorsal view of the same specimen. 

 G. Cenomanian, llouen. M. Fortin's Collection. Left valve with shell 

 preserved. 



7 — ]:>. ('. [f'ifrhirifiwii) J'lihii (Sow.), ['pper Groensaiiil, lilackdowu. Sedgwick 

 Museum, e.xcept figs. 11, 14, }■>. (P. 187.) 



7—9. Right valves. 



10. Hinge of right valve x 2. 



11. Left valve. Museum of Practical Geology, No. 10774. 



12. Dorsal view of lioth valves. 



13. Hinge of left valve x IL 



14. The T\\H' of Veniif: anhhvvu, Sow. P.ristol MiisiMim. (P. 180.) 



].5. The Type of Voiun immersa, Sow., somewhat crushe(l. P>rislol Museum. 



Gi'iins — Cr>EMENTi.\, (Irai/. 



l(j._]S. {'. (Fldvnitid) lUconlcaiia (d'Orl).). T.nwor Crcensand (P^rHrt-bed), 

 Athcrfield. Sedgwick Museum. l(i, 17, riglit valves; 18 o, left 

 valve; h, dorsal view of the same specimen — the lumde is drawn 

 from another specimen. (P. 18*.t.) 



10_2(i. 0. (Flaventia) oralis {^ow.). Upper Creensand, Blackdown. Sedgwick 

 :\Tusoum, Cambridge, e.xcept figs. 20, 1>3, 20. (P. IDl.) 



10—22. Riglit valves. 20, Museum of Practical Geology, No. 10778. 



23. British Museum, No. L10444. Interior of right valve. 



24. Hinge of right valve x H. 



25 a, left valve : /*, dorsal view of the same specimen. 



20. Museum of Practical Geology, No. 10814. Hiug«' of left valve x IJ. 



