108 CRETACEOUS LAMELLIBRANCHIA. 
1899. Moproua Corrm, A. Hennig. Bihang till k. Svenska Vet.-Akad. Handl., 
vol. xxiv, p. 13, pl. 1, figs. 16—19. 
1900. — Cuvrerr, A. Wollemann. Die Biv. u. Gastrop. d. deutsch. u. 
hollind. Neoe, (Abhandl. d. k. preuss. geol. Land., 
N. F.,, pt. 31), p. 68. 
Non 1847. Myrinus tineatus, J. Miller. Petref. Aachen. Kreidef., pt. 1, p. 34. 
— 1889. Seprrrer tineatus, LH. Holzapfel. Die Mollusk. Aachen. Kreide (Palxon- 
tographica, vol. xxxv), p. 216, pl. xxv, figs. 10—138 
(these figures are enlarged three times). 
Description.—Shell thin, ovate-oblong, inflated, regularly convex from the umbo 
to the posterior extremity, more or less compressed at right angles to its greatest 
length (dorso-ventrally) ; shghtly curved or occasionally straight. Dorsal margin 
slightly convex. Posterior extremity well rounded, a little expanded. Antero- 
ventral margin slightly concave, sometimes straight. Umbones small, curved, 
terminal. Carina faintly marked near the umbo, absent elsewhere. Antero-ventral 
face of the shell flattened or concave, postero-dorsal part regularly convex. 
Ornamentation consists of fine but well-marked radial ribs, crossed by rather 
less distinct concentric ribs, giving a cancellate appearance; the radial ribs are 
serrate or granular where crossed by the concentric ribs. At intervals fairly strong 
erowth-lines occur. An oval area below the umbones is without radial ribs, and 
shows only lines of growth. 
Measurements : 
Umbo to posterior qa) (2) (3) (4) (5) (6) (7) (8) (9) (40) 
extremity . . 49 42 42 4) 37 34 32 29 36 28 mm. 
Greatest diameter at 
right angles to pre- 
ceding . : . 18 15 14 145 14 12 12 
Thickness : . 29 25 23 26 22 20° 15 
(1—3, 6) from the Hythe Beds, Lympne. 
(4) - Chalk Marl, Chardstock. 
bo 
1 i 
1 16 
| 
vr 
Or 
29 
(5) > - Kempstone Rocks. 
(7) ” ») Dunscombe. 
(8) » 9 Titherleigh, 
(9, 10) Chalk Rock, Cuckhamsley. 
Affinities —The specimens figured by Geinitz as M. Cotte in ‘Das Elbthalge- 
birge in Sachsen’ agree perfectly with our examples from the Cenomanian. The 
figures of M. Cotte given by earlier authors appear to represent imperfect or 
crushed specimens, and I follow Geinitz, who was probably acquainted with the 
originals, in regarding them as the examples of M. Cotte. 
Modiola angusta, Romer, is considered by Wollemann to be identical with M. 
lineata ; 1 have seen no examples of it. 
