94 CRETACEOUS LAMELLTBRANCHIA. 



Pictet and Campiclie,' show a more elongate sliell ; the species is referred by these 

 authors to Lithodomus. 



M. culter, A\^ollemann,- from the Hils-conglomerate of Brunswick, is closely 

 allied ; it appears to differ chiefly in having a more angular outline and a distinct 



carina. 



^'oung specimens of M. sequalls are similar in form to M. matvonensis, 

 d'Orbigny,'' but apparently somewhat longer. 



I am unable to distinguish M. obesa, Keeping (from Upware), from M. seqiiali,^ ; 

 its somewhat greater inflation is, I think, due to crushing. 



Tijpes. — In the British Museum — internal casts from the Sandgate Beds of 

 Parham Park. The type of M. obesa, Keeping, is in the Woodwardian Museum. 



Dbstribiitioii. — Perna-hed, Crackers, and Beds 35 and 30 (Fitton) of Atherfield. 

 Penia-heA of Redcliff. Ferruginous Sands of Shanklin. Atherfield Beds of Seven- 

 oaks and Peasmarsh. Hythe Beds of Maidstone. Sandgate Beds of Parham Park. 

 Lower Greensand of Upware. 



MoDioLA PvEVERSA, Soicevb}/, I80G. Plate XV, figs. 15, 10, 1 7 ^^ b, 18 a — c ; 



Plate XVI, figs. 1, 2 a, b, 3. 



1836. MoDiOLA REVERSA, J. cle G. Soiverhy. Trans. Geol. Soc, ser. 2, vol. iv, 



pp. 241, .342, pi. xvii, fig. 13. 

 ? 1842. — L^viGATA, H. B. Oeinitz. Char, der Schicht. und Petref. des 



siiclis.-bohm. Kreidegeb., pt. 3, p. 78, pi. xx, fig. 35. 

 ? 1843. — REVERSA, H. B. Oeinitz. Die Verstein. von Kieslingswalda, p. 15, 



pi. iii, fig. 11. 

 1844. Mttiltjs semiradiatus, A. cCOrhicjmj. Pal. Fran9. Terr. Crct., vol. iii, 



p. 277, pi. cccxli, figs. 1, 2. 

 1850. MoDiOLA REVERSA, H. B. GeinHz. Das Quadersandst. oder Kreidegeb. in 



Deutsclilaud, p. 168 (partini). 

 18.50. MiTYLTjs REVERSUS, A. d'Orhitjnij. Prodr. de Pal., vol. ii, p. 165. 

 1854. MoDioLA REVERSA, J. Movris. Cat. Brit. Foss., ed. 2, p. 211. 



1867. Mytilus (Modiola) reversus, F. J. Pictet and G. Campiclie. Foss. Terr. 



Cret. Ste. Croix (Mater. Pal. Suisse, ser. 4), p. 510. 



1868, — BEVERSus, A. Briart and F. L. Cornet. Descript. Min. geol. et 



Pal. de la Meule de Bracquegnies (Mem. cour. et 

 Mem. des Sav. etrangers, vol. xxxiv), p. 53, pi. iv, 

 figs. 9, 10. 



' "Foss. Terr. Cret. Ste. Croix" ('Mater. Pal. Suisse,' ser. 3, 1866), pp. 517, 524, pi. cxxxiv 

 tig. 8. 



2 'Zeitschr. d. deutsch. geol. Gesellscli.,' vol. xlviii (1896), p. 843, pi. xxi, f. 4; and 'Die Biv. u. 

 G-astrop. d. deutsch. u. hoUiind. Neoc' (1900), p. 65. 



« 'Pal. Franc. Terr. Cret., vol. iii (1844), p. 269, pi. cccxxxvii, figs. 14—16. 



