88 CRETACEOUS LAMELLIBRANCHIA. 



1850. Perna Muletii, A. d'Orbigny. Prodr. de Pal., vol. ii, p. 82. 



1854. — Mulleti, /. Morris. Cat. Brit. Foss., ed. 2, p. 179. 



1855. — Muletii, G. Cotteau. Moll. Foss. de l'Yonne, p. 106. 



1869. Mulleti, F. J. Pictet and G. Campiche. Foss. Terr. Cre't. Ste. Croix 



(Mater. Pal. Suisse, ser. 

 5), p. 97, pi. clviii. 

 — — Forbesi, Pictet and Campiche. Ibid., p. 99, pi. clix. 



1871. Melina Mulleti, F. Stoliczka. Palaxmt. Indica, Cret. Fauna S. India, 



vol. iii, p. 400. 



1883. Perna Mulleti, W. Keeping. Foss. etc., Neoc. Upware and Brickhill, 



p. 150. 



1884. — — O. Weerth. Die Fauna des Neocom. im Teutoburg. Wald. 



(Paheont. Abhandl., vol. ii), p. 49. 

 1886. (Mulletia) Mulleti, P. Fischer. Manuel de Conch., p. 956, 



fig. 725. 



1895. — Mulleti, F. Vogel. Holliindiscli. Kreide, p. 55. 



— G. Maas. Zeitschr. der deutscb. geol. Gesellsch., vol. 

 xlvii, p. 267. 



1896. A. WoUemann, Ibid., vol. xlviii, p. 843. 



1900. — Die Biv. u. Gastrop. d. deutsch. u. hol- 



liind. Neocoms (Abhandl. d. k. preus- 

 sich. geol. Land., N. F., pt. 31), p. 60. 



Description. — Shell large, thick, compressed, more or less quadrilateral, with 

 unequal angles. Hinge-line long. Umbones almost terminal. Anterior part of 

 the shell sharply bent, and more or less nearly perpendicular to the plane of the 

 two valves ; anterior marginal part more or less deeply concave. From the umbo 

 start two strong, broad, rounded folds ; the anterior of these is near the anterior 

 margin and curves anteriorly, its extremity forming the antero-ventral angle; the 

 posterior fold at first curves ventrally and afterwards posteriorly, and its termina- 

 tion forms the postero-ventral angle. The part of the shell behind the posterior 

 fold is compressed and flattened and produced into a wing of varying length. 

 The junction of the two valves is sinuous, the anterior, the ventral, and the 

 posterior margins (between the angles) being concave on the right valve and 

 convex on the left. 



The shell is ornamented with distinct growth ridges which bend ventrally in 

 passing over the folds and form a semicircular or semi-oval curve near the 

 hinge-line. 



Measurements : 



(i) (2) (3) 



Length of hinge-line . .128 . 120 . 95 mm. 



Height (from umbo to postero- 

 ventral angle) . . . 114 . 135 . 130 „ 



(1—3) Penia-bed, Atherfield. 



