16 CRETACEOUS LAMELTJBR AXCTITA. 



be confined to tlio anterior and posterioi- ])arts of the valves or ina_y extend over 

 the whole surface. The grooves are soniewliat irreG^nlar aiid tlie interspaces are 

 broad and flattened. At distant intervals a few well-inarked Ljrowtli-riniifs occnr, 

 l)cyond -which, in some cases, the iil)s cease. 

 Arf'anirrrmfvfs : 



(I) (2) 



Length . (\9 . 53 



Height . 71 . 5G 



(1 — .5) Uppov GrociisaiKl, Wariiiiiistor. 



Affivifici. — This species differs from Li'ma armhivuKfn (p. 1 1) in lieing larger, 

 relatively higher, more trigonal in outline, and in having tlie I'adial grooves nmi'c 

 extensively developed. It is distingnisheil fi'oni Lhiiit sin/jih-.r, (l"()i'l)igny,' in 

 being nnicli less convex, in the height being relativel}' less, the antei-o-dorsal 

 margin shorter, the anterior area smaller, and the anterior grooves less })rominent. 



The shell is relatively longer and the apical angle larger than in L. siiJi-rnvfto- 

 Iniiiii, d'Orbigny." It is also relatively longer, Avith a longer antero-dorsul nuirgin 

 and the radial grooves less well developed, than in L. nrtumi (p. 22). 



Tijix'n. — From Warminster. In the Museum of Practical Geology. 



Dinfribitfinn. — Upper Grecnsand (zone of Ppc/pu asppr) of Warminster. Eye 

 Hill Sands and Chloritic Marl of Maiden Bradley. Cennmaninn flMeyer's Beds 10 

 and 11) of Hooken and Dunscombe (Devon coast). 



liLMA (l'l..\i;insTnMA) (il.olinSA {Si)irri-h//), \H'A(>. I'llltc I \\ flgS. 4w^ — C, hilji, i't (I — C. 



183G. LuciNA? Gi.oBosA, J. (}(' C. Sowrhi/. Tiaus. GphI. Soe., ser. 2, vol. iv, 



p. 335, pi. xi, fig. 2 (non Lucimi 

 ylohosa, Riimer, 1839). 



1854. Lima (iLODosA. J. Morris. Cat. Brit. Foss., ed. 2, p. 171. 



1895. — — E. Tiessen. Zeitschr. iI.t dcuts.li. l;oi.1. Oosfllsili., v..l 



.\lvii, ]). 473. 



Descrijitioii. — Shell very convex, of moderate size, oval, length considei'ably 

 greater than height, outline rounded with the nntero-dorsal margin long and 

 straightened. Umbones incurved, bhint. Apical angle al)out 11S\ Anterioi' 

 area large, very deep, limited by a sharj) edge, with ratUal i-ibs. Ears small. 



S\irface of v.alves polished, with faintly-marked growth-lines at intervals; 



' 'Pal. Fi-au^. Terr. Crct.,' vol. iii (1847), p. 545, pi. ccccxviii, fijrs. 6—7. 



- Il)id., p. 55G, pi. ccccxxii, figs. 4 — 7; L. »uh-consohrinii, d"Orl)igny, ' Prodr. de Palcont.,' vol. ii 

 (1850), p. 167. 



