cu.] 



LAMELLIBRANCHIA TA. 



471 



leavenwprthensis, Meek & Hayden, 1858, 

 (Allorisma leavenworthense,) Proc. 

 Acad. Nat. Sci. Phil., p. 263, and Pal. 

 Up. Mo., p. 43, Coal Meas. 

 maria, Worthen, 1882, Bull. No. 1. 111. St. 

 Mus. Nat. Hist., p. 39, and Geo. Sur. 

 111., vol. 7, p. 319, Up. Coal Meas. 



minnehaha, Swallow, 

 1858, (Allorisma (?) 

 minnehaha,) Trans. 

 St. Louis Acad. Sci., 

 vol. 1, p. 194, and 

 Geo. Sur. 111., vol. 5, 

 p. 588, Coal Meas. 

 rhomboidea, Meek & 

 Worthen, 1865, Proc. 

 Acad. Nat. Sci. Phil., 

 p. 250, and Geo. Sur. 

 111., vol. 5, p. 540, 

 St. Louis Gr. 

 CIMITARIA, Hall, 1870, 

 Prelim. Notice Lam. 

 Shells, p. 66. [Ety. 

 from resemblance to 

 a cimiter.] Equi- 

 valve, transversely 

 elongated ; valves 

 depressed, with an 

 antero-mesial con- 

 striction ; beaks in- 

 curved ; cardinal line 

 recurved ; escutch- 

 eon and lunule ; liga- 

 ment external; sur- 

 face concentrically lined. Type C. re- 

 curva. 

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



468, Chemung Gr. 



corrugata, Conrad, 1842, (Cypricardites 

 corrugatus,) Jour. Acad. Nat. Sci., vol. 8, 

 p. 244, and Pal. N. Y., vol. 5, pi. 77, figs. 

 1-4, Ham. Gr. 



FIG. 793 Chsenomya 

 maria. Dorsal 

 view. 



FIG. 794. Cimitaria recurv; 



elongata, Conrad, 1841, (Cypricardites 



elongatus,) Ann. Rep. N. Y., p. 51, and 



Pal. N. Y., vol. 5, pi. 77, figs. 5-8, 



Ham. Gr. 

 recurva, Conrad, 1842, (Cypricardites re- 



curvus,) Jour. Acad. Nat. Sci., vol. 8, p. 



245, and Pal. N. Y., vol. 5, pi. 77, figs. 



9-16, Ham. Gr. 

 CLIDOPHORUS, Hall, 1847, Pal. N. Y., vol. 1, 



p. 300. [Ety. kleidos, a clavicle ; phoros, 



bearing.] Equi valve, inequilateral ; 



hinge without teeth or crenulations ; 



cast marked by an oblique linear de- 



pression extending from the anterior 

 cardinal margin toward the base, indi- 

 cating the existence of a clavicle as in 

 Solecurtus ; surface concentrically lined. 

 Type C. planulatus. 



chicagoensis, S. A. Miller, 1880, Jour. Cin. 

 Soc. Nat. Hist., vol. 3, p. 314, Niag- 

 ara Gr. 

 concentricus, Hall, 1860, Can. Nat. and 



Geo., vol. 5, p. 149, Low. Sil. 

 concentricus, Dawson, 1868. The name was 



preoccupied, 

 cuneatus, Hall, 1860, Can. Nat. and Geo., 



vol. 5, p. 148, Low. Sil. 

 ellipticus, Ulrich, 1879, Jour. Cin. Soc. 

 Nat. Hist., vol. 2, p. 25, Hud. Riv. Gr. 

 elongatus, Hall, 1860, Can. Nat. and Geo., 



vol. 5, p. 150, Low. Sil. 

 erectus, Hall, 1860, Can. Nat. and Geo., 

 vol. 5. p. 149, and Acad. Geol., p. 600, 

 Up. Sil. 

 erectus, Dawson, 1868. The name was 



proccupied. 

 faberi, n. sp. Shell 

 small, smooth, 

 subelliptical in 

 outline, length 

 greater than 

 height ; anterior 

 end narrower 

 than the poste- FIG. 795.-CHdophorus fa- 

 rior ; basal mar- beri. Mag. 5 diam. 

 gin a semi- 

 elliptic curve; beaks prominent, and 

 but little in advance of the middle; 

 umbonal slope rounded, and tapering 

 to the postero-basal margin of the 

 shell ; cardinal line gently curving, 

 reaching the highest point posterior to 

 the middle of the shell ; pallial line simple 

 and well denned ; furrow deep, and ex- 

 tending from immediately in front of 

 the beaks to the pallial line. 

 Distinguished from C. fabula 

 by the more prominent 

 beaks and higher arch in 

 the cardinal line posterior to 

 the beaks and other minor 

 particulars ; beside it is gen- 

 erally a larger shell, though 

 variable in size. Collected 

 in the upper part of the 

 Hud. Riv. Gr., near Ver- 

 sailles, Indiana, and in Butler 

 County, Ohio. 



fabula, Hall, 1845, (Nucula fab- 

 ula,) Am. Jour. Sci. 

 and Arts, vol. 48, 

 p. 295, and Ohio 

 Pal., vol. 1, p. 138, 



Hud. Riv. Gr. FIG. 796. Clidophorus 



macchesneyanus, syn. fabula. Bight side 



for Mr>rHnlnnsi<s and dorsa l view of a 



oiopsis cast magnified 10 



recta. diameters, 



major, Ulrich, 1879, 



Jour. Cin. Soc. Nat. Hist., vol. 2, p. 25, 



Hud. Riv. Gr. 

 neglectus, Hall, 1862, Geo. Rep. Wis., p. 



55, Hud. Riv. Gr. 



