CUCULLiEA. 109 



V. Family — Aecid^, Gray, 1840. 



1. Genus — Cucull^a, LamarcJe, 1801. 



The arrangements of the teeth show that the first and therefore probably both 

 of the following species do not belong to Dolabra, M'Ooy. There seems no reason 

 for removing them from the genus in which they were placed by Sowerby and by 

 Phillips. 



1. CuouLLJiA UNiLATERALis, Soioerby. Plate XI, figs. 4 — 13, and Plate XIII, 



figs. 10, 10 a, 11. 



1840. CucuLL^A 0NILATEEALIS, Sowerhy. Geol. Trans., ser. 2, vol. v, pt. 3, 



pi. liii, fig. 23. 



1840. — TEAPEZITJM, Sowerhy. Ibid., pi. liii, fig. 24. 



1840. — ANGTTSTA, Sowerhy. Ibid., pi. liii, fig. 25. 



1840. — Haedingii, Sowerhy. Ibid., pi. liii, figs. 26, 27. 



1841. — AMXQDAJA^h., Phillips. Pal. Foss., p. 40, pi. xviii, figs. 66 a — d. 

 1841. — Haedingii, Phillips. Ibid., p. 40, pi. xviii, figs. 67a, J; and 



pi. xix, figs. 67 a, b. 

 1841. — A.S Qxs ST &., Phillips. Ibid., p. 41, pi. xix, figs. 68 a — c. 



1841. — TjNiLATEEALis, P/n7Z?ps. Ibid., p. 41, pi. xix, figs. 69 «— (?. 



1841. — TEAPEZiUM, Phillips. Ibid., p. 41, pi. xix, fig. 70. 



1855. DoLABEA ANGUSTA, M'Qoy. Brit. Pal. Foss., p. 393. 

 1855. — Haedingi, M'Coy. Ibid., p. 395. 



1855. — TJNiLATEEALis, M'Coy. Ibid., p. 395. 



1895. — — var. condrusouum:, Beushausen. Abh. k. Preuss. 



Geol. Landes., n. s., pt. 17, p. 34, pi. viii, 



figs. 25—28. 

 1895. — cf. ANGUSTA, Beushausen. Ibid., p. 35, pi. viii, fig. 29. 



J)escri]jtion. — Shell large, convex, very variable in shape. Umbo large, more 

 or less anteriorly situated, elevated above the hinge-margin, incurved, tending 

 obliquely forward, and more or less truncated behind. Hinge-area large, flat, 

 triangular, transversely striated. Hinge-line straight, large, shorter than the 

 length of the shell, bearing a few subparallel, long, transverse teeth both before 

 and behind. Anterior margin roundly convex, narrower than the posterior 

 margin. Inferior margin slightly convex, usually oblique. Postero-inferior 

 corner produced, rounded. Posterior margin oblique, straight or rather convex. 

 Contour of back very convex, greatest depth on line from umbo to postero- 



