76 CRETACEOUS LAMELLIBRANCHIA. 



Section 3. — GtLABR^. 



Trigonia eccentrica, Pa77,'M/so», ]811. 



1811. Trigonia eccentrica, /. ParMnso7i. Org. Remains, vol. iii, p. 175, pi. xii, 



fig. 5. 

 1811. — siNUATA, ParAimsow. Ibid., p. 177, pi. xii, fig. 13. 



1818. — ECCENTRICA, J. Soivevby. Min. Conch., vol. iii, p. 11, pi. ccviii, 



figs. 1, 2. 

 1828. — ExcENTRicA, Defvance. Diet. Sciences nat., vol. iv, p. 296. 



1837. — — G. G. Pusch. Polens Paliiont., p. 61. 



1837. — siNtjATA, Piisch. Ibid., p. 61. 



1840. — EXCENTRICA, L. Agussiz. Etudes crit. Moll. Foss. (Trigon.), 



p. 9. 

 1848. Lyriodon sinuatus, H. G. Broun. Index Palseont., vol. i, p. 688 (partim), 

 1848. — EXCENTEicus, Btomi. Ibid., p. 686 (partim). 



1850. Trigonia excentrica, A. d'Orbigny. Prodr. de Pal., vol. ii, p. 162. 

 1854. — — /. Morris. Cat. Brit. Foss., ed. 2, p. 228. 



1866. — ~ F. J. Pidet and G. Gampicle. Foss. Terr. Cret. 



Ste. Croix (Mater. Pal. Suisse, ser. 4), p. 387. 

 1866. — siNUATA, Pidet and Gampidie. Ibid., p. 387 (partim). 



1875. — EXCENTRICA, Lyceft, p. 94 (partim), pi. xx, fig. 6 (not 5) ; pi. xxi, 



fig. 6 ; pi. xxii, fig. 5 ; pi. xxviii, figs. 6, 9, 10. 



Non 1837. Ltrodon excentricum, A. GoldJ'uss. Petref. Germ., vol. ii, p. 203, pi. 



cxxxvii, fig. 8 (= Trigonia Midieloti, de 

 Loriol) . 



— 1847. Trigonia excentrica, /. MiiUer. Petref. Aachen. Kreideformat., pt. 1, 



p. 16. 



— 1847. — SJSXJA.TA, A. d'Orbigny. Voy. Astrol. Pak'ont., pi. iv, figs. 29, 30. 



Reuiarl-s. — This is distinguished from T. affinh, Sowerl)y, by being proportion- 

 ately longer, more produced posteriorly, less ovoid in outline, and in having the 

 costae near the antero -ventral margin less regularly concentric (except in small 

 specimens) . 



Ti/pes. — I have not seen Parkinson's types. The specimen figured by Sowerby 

 is in the British Museum. Specimens figured by Lycett are in the Museum of 

 Practical Geology (pi. xxi, fig. G; pi. xxii, fig. 5), and in Mr. Vicary's collection 

 (pi. XX, fig. 6; pi. xxviii, figs. 6, 9, 10). The original of pi. xx, fig. 5, stated by 

 Lycett to be from Blackdown, is in the British Museum (No. 32396) ; it is really 

 from the Cenomanian of Le Mans, and is an example of T. siniiata, d'Orbigny {non 

 Parkinson) — see T. affinis. 



Distribution. — Grreensand of Blackdown (Zone xi), Haldon, and Kingskerswell, 



