SPA. SPH.] 



LAMELLIBRANCHIA TA. 



513 



SPATHELLA, Hall, 1885, Pal. N. Y., vol. 5, p. 

 33. [Ety. spathe, a spathe ; ellus, di- 

 minutive.] Equivalve, very inequilat- 

 eral, wider behind, transversely sub- 

 cylindrical ; anterior end short, nar- 

 rowly rounded ; beaks subanterior, 

 small ; umbonal slope rounded or sub- 

 angular ; surface concentrically lined. 

 Type S. typica. 

 typica, Hall, 1885, Pal. N. Y., vol. 5, p. 



407, Chemung Gr. 



ventricosa, White & Whitfield, 1862, 

 (Ortbonota ventricosa,) Proc. Bost. Soc. 

 Nat. Hist., vol. 8, p. 297, and Pal. N. Y., 

 vol. 5, p. 408, Waverly Gr. 

 SPHENOLIUM, n. gen. [Ety, sphen, wedge; 

 leion, smooth.] Shell large, equivalve. 

 inequilateral, elongate, cuneiform, ven- 

 tricose ; umbones prominent; beaks in- 

 curved at the anterior end ; cardinal 

 line at an angle of fifty or sixty degrees 

 from the basal line, and appearing 

 wing-like toward the posterior end; 

 lunule present ; no escutcheon ; liga- 

 ment external ; muscular scars and 

 hinge-line unknown. Type S. cunei- 

 forme. 



cuneiforme, S. A. Miller, 1881, (Ortho- 

 desma cuneiforme,) Jour. Gin. Soc. 

 Nat. Hist., vol. 3, p. 314, Hud. Riv. Gr. 

 faberi, n. sp. Shell below the medium 

 size for species in this genus ; beaks 

 unite over 

 the hinge- 

 line near the 

 anterior end ; 

 anterior end, 

 pointed, 

 rounded ; 

 FiQ.924. Sphenoliam faberi. hinge-lin e 

 Left valve. rising poste . 



riorly into a wing-like expansion ; pos- 

 terior end prolonged at the postero- 

 basal margin; basal margin subellip- 

 tical; umbones high and gradually 

 tapering to the posterp-basal margin ; 

 surface concentrically lined. Collected 

 by Charles Faber in the Hud. Riv.Gr., 

 at Cincinnati, Ohio. 



FIG. 92-5. Sphenolium richmondense. 



richmondense, n. sp. Shell large, cunei- 

 form, ventricose, beaks incurved at the 

 anterior end, pointed ; umbones high, 

 defined ; cardinal line at a high angle, 



haying a wing-like posterior end; an- 

 terior end rounded below the lunule. 

 Dist inguished 

 from S. cunei- 

 forme, which it 

 much resembles, 

 by its shorter 

 form and more 

 angular umbones. 

 Possibly more 

 specimens may 

 show a gradation FIG. 926. Sphenolium 

 from one form richmondense. An- 

 to the other, te " orview - 

 and if so, this specific name will fall 

 into synonymy. Collected by Charles 

 Faber in the upper part of the Hud. 

 Riv. Gr., at Richmond, Indiana. 

 SPHENOTUS, Hall, 1885, Pal. N. Y., vol. 5, p. 

 33. [Ety. sphen, wedge; ous, ear.] 

 Equival v e , 

 very in- 

 equilateral, 

 elongate; 

 anterior end 

 short ; pos- 



FIG. 927. Sphenotus aeolus. teripr end 



obliquely 



truncate ; cardinal line, long, straight ; 

 umbonal ridge extending to the post- 

 inferior extremity; surface concen- 

 trically lined ; two short teeth beneath 

 the beak of the right valve, and one or 

 two slender lateral teeth ; ligament ex- 

 ternal, contained in a groove ; anterior 

 muscular scar strongly marked; pos- 

 terior scar shallow ; pallial line simple. 

 Type S. arciformis. 



seolus, Hall, 1870, (Sanguinolites seolus,) 

 Prelim. Not. Lam. Shells, p. 46, and 

 Pal. N. Y., vol. 5, p. 404, Waverly Gr. 

 arciformis, Hall, 1870, (Sanguinolites 

 arcseformis,) Prelim. Not. Lam. Shells, 

 p. 40, and Pal. N. Y., vol. 5, p. 395, 

 Ham. Gr. 

 arcuatus, Hall, 1885, Pal. N. Y., vol. 5, p. 



400, Chemung Gr. 



clavulus, Hall, 1870, (Sanguinolites cla- 

 vulus,) Prelim. Not. Lam. Shells, and 

 Pal. N. Y., vol. 5, p. 401, Chemung Gr. 

 contractus, Hall, 1843, (Cypricardia con- 

 tracta,) Geo. Sur. 4th Dist. N. Y., p. 292, 

 and Pal. N. Y., vol. 5, p. 399, Che- 

 mung Gr. 



cuneatus, Conrad, 1838, (Pterinea cune- 

 ata,) Ann. Rep. Geo. N. Y., p. 116, and 

 Pal. N. Y., vol. 5, p. 396, Ham. Gr. 

 flavius, Hall, 1870, (Sanguinolites flavius,) 

 Prelim. Not. Lani. Shells, p. 47, and 

 Pal. N. Y., vol. 5, p. 403. Waverly Gr. 

 rigidus, White & Whitfield, 1862, (Cypri- 

 cardia rigida,) Proc. Bost. Soc. Nat. 

 Hist, vol. 8, p. 300, and Pal. N. Y., 

 vol. 5, p. 402, Waverly Gr. 

 signatus, Hall, 1885, Pal. N. Y., vol. 5, p. 



405, Waverly Gr. 



solenoides, Hall, 1870, (Sanguinolites 

 solenoides,) Prelim. Not. Lam. Shells, p. 

 38, and Pal. N. Y., vol. 5, p. 398, Ham. Gr. 



