PHOLADOMYA. 251 
1850. PuHonapomya pecussata, A. Alth. Geogn.-paleont. Beschreib. v. Lemberg 
(abid.), p. 236. 
1854. — — J. Morris. Cat. Brit. Foss., ed. 2, p. 220. 
1861. — _ var. TRIANGULARIS, H. G. Seeley. Ann. Mag. Nat. 
Hist., ser. 3, vol. vii, p. 122. 
1863. — (CarpIuM) pEcussata, A. v. Strombeck. Zeitschr. der deutsch. 
geol. Gesellsch., vol. xv, p. 143. 
1865. — pecussata, FI’. J. Pictet and G. Campiche. Terr. Crét. Ste. 
Croix (Matér. Pal. Suisse, ser. 4), p. 94. 
1869. — — EH. Favre. Moll. Foss. de la Craie de Lemberg, 
p- 106. 
1875. = a A. J. Jukes-Browne. Quart. Journ. Geol. Soe., 
vol. xxxi, p. 300. 
~~ == — C. Moesch. Mon. Pholadomyen, p. 107, pl. xxxii, 
figs. 5 ?,6; pl. xxxvi, figs. 5, 6. 
1876. = = D. Brauns. Zeitschr. f. d. gesammt. Naturwiss., 
vol. xlvi, p. 361. 
? 1889. — — Ei. Holzapfel. Die Mollusk. Aachen. Kreide (Pal- 
eeontographica, vol. xxxv), p. 154, 
pl. xiv, figs. 3, 4. 
1891. — — J. Bohm. Kreidebildung. d. Fiirbergs u. Sulz- 
bergs (Paleontographica, vol. xxviii), p. 73. 
1893. — — A. Fritsch. Stud. im Gebiete der béhm. Kreide- 
format. v. Priesen. Schicht., p. 97, fig. 116. 
? 1898. — = G. Miller. Mollusk. d. Untersen. v. Braunschweig 
u. Lsede, p. 74, pl. x, fig. 3. 
1901. —— — A. Wollemann. Jahrb. d. k. preuss. geol. Landes- 
anst. fiir 1900, vol. xxi, p. 22. 
1902. — ~- A. Wollemann. Liineburg. Kreide, p. 79. 
Non 1829. — — J. Phillips. Geol. Yorks., pp. 122, 186 (p. 255, 
ed. 3), pl. u, fig. 9: 
— 1842. _ = L. Agassiz. tudes crit. Moll. Foss., Myes, p. 74, 
pl. iv, figs. 9,10; pl. iv}, figs. 7—11. 
— 1848—50. — — G. P. Deshayes. Traité Elément. de Conchyliol., 
vol. i, pt. 2, p. 158, pl. v, fig. 5. 
— 1849. — — A. d Orbigny. Prodr. de Pal., vol. i, p. 335. 
Distribution.—Shell large, inflated, with the greatest diameter at the anterior 
end, outline semi-ovate (sometimes sub-trigonal), wedge-shaped behind, extremely 
inequilateral, with a small posterior gape; height and length often nearly equal. 
Ventral margin shghtly curved. Posterior margin rounded. Anterior part of the 
shell very short, flattened, with cordate outline, nearly perpendicular to the plane 
between the valves, and forming almost a right angle with the sides of the valves ; 
the margin of the anterior part is more or less angular, and just within is a 
shallow concaye part parallel to the margin, whilst the median part is convex, and 
