32 CRETACEOUS LAMET/IJBRANCHIA. 



weaker posteriorly. The sides of the ribs are oriianiented witli fine radial ribs, and 

 at the summit there is sometimes a rib with pointed projections. Concentric 

 growth-lines are present. 

 Measurements : 



Length 

 Height ' . 



Affinities. — Lima Itcviana, Pictet and Roux,- appears to differ from this species 

 in having a small rib at the bottom of the groove, and in being relatively shorter. 

 Pictet and Canii)iche state that the small rib is not always present. I have seen 

 no trace of such a rib in even the best preserved examples of L. gunltina. See also 

 Lima elomjata (p. 36). 



Bemarls. — One of the specimens figured by Sowerby as Flagiostoma cloinjutu 

 (the upper figure 2 of Plate DLIX) is probably an exanii)le of this species, but since 

 it is an internal cast only, it is difficult to be sure of its identity without seeing 

 other specimens from the same horizon. The specimen in question, however, 

 asfrees in form and in the characters of the ribs with other internal casts which 

 imdoubtedly belong to this species. D'Orbigny referred this species to Lima 

 ■paraUcla (Sowerby) and also included with it L. cloiujata, Sowerby (p. 3-1). 



Types. — The specimen figured by Sowerby, mentioned above, is stated to come 

 from the " Greensand of Folkestone." D'Orbigny's specimens of LAma paralhla, 

 d'Orbigny non Sowerby, came from the Gault of Gerodot and Dienville (Aube). 



Distribution. — Gault of Folkestone (zones ii, vii, ix). Gault of Veutnor and 

 JJlack Ven. Cambridge Greensand (derived). Upper Greensand (zone of 

 ScldcJOidHichia roslrata) of Devizes. Internal casts from the Speeton Clay (zone of 

 Belemnitcs jacidum, C 11) seem to be indistinguishable from this species. 



Lima (]V1anteija:m) inteulinkata, Jukes- Bruwtw, 1877. Plate VI, figs, ia, I/. 



1877. Lima interlinbata, A. J. Jukes-Browne. Quart. Journ. Geol. Soc, 



vol. xxxiii, p. 502, pi. xxi, fig. 10. 



Dfxrrqilii)n. — Shell moderately convex, roundetl-ublong. Umbones and ears 

 uuL seen. 



' Measured perpeinlicular to the liiugc-line. 



2 'Moll. Foss. Grts verts ile Geuive " (1852), p. 484, pi. xl, fig. 5 ; F. J. Pietet aud G. Caiupiehe, 

 'Foss. Terr. Crct. Sto. Croix ' (Mater. Pal. Suisse, ser. 5, 1869), p. 156, pi. clxvi, figs. 4, 5. 



