157 



there is a corresponding groove. Lunular margin of the valves very 

 sharp, thin and toothless. Pallial margin simple, entire. 



Length, eighteen lines; height, fourteen; thickness through the 

 valves, twelve. 



Below Dodd Narrows, V.I., in Division A ; J. Eichardson, 1872. Nine 

 good specimens. 



LUOINA NASUTA, GaBB. 

 Lucina nasuta, Gabb. — Pal. Cal., Vol. I, p. 175, pi. 2-1, fig. 159, 



Sucia Islands, in Division A; J. Richardson, 1874. One small example. 



A ver}'- imperfect specimen from below Dodd Narrows, V.I., which 

 measm-es upwards of three inches in length and more than two in height, 

 probably also belongs to this species. 



Lucina subcircularts ? (Jabb. 

 Lucina subcircularts, Gabb.— Pal. Cal., Vol. 1, pp. 176, pi. 24, fig. 160. 



Sucia Islands, in Division A ; J. Richardson, 187-1:. A cast of the right 

 valve, with fragments of the test preserved. 



Clisocolus cordatus. Meek and Hayden. (Sp.) 



Plate 18, Figures 3, 3a and 3b. 



Ci/prina cordata, Meek and Hayden. — Proc. Ac. Nat. Sc. Phil., 1857, Vol. IX., p. 143. 



Bucardia? Moreaiiensis, M. and H. — lb. 1860, Vol. XII., p. 426. 



Glossus ? Moreauensis, Gabb. — 1861, Cat. Ciet. Fossils, p. 125. 



Sphxriola ? cordata, M. and H. — Rep. on Inv. Cret. and Tert. Foss. U. Miss. Co., 



p. 137, pi. 29, figs. 3'/, b, c. 

 ? = Sphseriola endotrachyg, Meek. — Idem, p. 139, pi. 29, fig. 2. 

 Loripeidubia,Ga.\<b. —Pal. Cal., Vol. I., p. 177, pi. 24, figs. 170 and 



171. 

 Clisocolus dubius, Gabb. — Idem, Vol. II., p. 139, pi. 29, fig. 2. 



Shell globose, very gibbous, especially in the umbonal region, higher 

 than long, thickness through the valves about equal to the height. Sides 

 and base rounded, the latter a little flattened; umbones broad, tumid, 

 elevated and approximate; beaks placed a little in advance of the mid- 

 dle, subspiral, their apices divergent and curving outwards ; no distinct 

 lunule or posterior area. 



Surface of j'oung specimens concentrically ribbed and marked also by 

 faint, radiating impressed lines. In adult shells the ribs«almost dis- 

 appear, their place being taken b}- coarse, irregularl}^ disposed, concen- 

 tric striations, and by a few broad, shallow and distant sulcations, the 



L 



