264 PALEONTOLOGY OF NEW YORK. 



Genus MEEKELLA, White and St. John. 1868. 



PLATE X, FIGS. 18-23; AND PLATE Xlli, FIGS. 18-2-2. 



1837. Choristitcs (partim), Fischer de WALDiiBrM {fide VERNBtjiL). Oryctogi-. du Gouvern. de Moscou, 



1"). 141, pi. xxii, fig-. 4. 

 1845. Orthis, db Vbrneuil. Geol. de la Russie d'Europe et des Montagnes de I'Oui-al, i)p. 192-194, pi. ix, 



figs. 2, 3 (Productus, Eichwald. Coll. du Corps des Mines de St. Petei-sb.). 



1857. Plicatula, Cox. Owen's Rept. Geological Survey Kentucky, vol iii, p. 568, pi. viii, fig. 7. 



1858. Orthisi7ia, Swallow. Trans. St. Louis Academy of Science, vol. i, pj). 183, 219. 



1859. OrtMsina, Meek and Hayden. Pi-oc. Acad. Nat. Sci. Phila., p. 26. 



1861. StreptorhyncJiUs, Newberry. Lieut. Ives' Rept. Colorado River; Palaeontology, pt. iii, chap, xi, 



p. 126, pi. i, fig. 5 ; pi. ii, figs. 11-13. 

 1866. Orthis, Geinitz. Carbon, and Dyas in Nebraska, p. 48, pi. iii, figs. 22-24. 

 1868. Meekella, White and St. John. Ti-ans. Chicago Academy Sciences, vol. i, p. 120, figs. 4-6. 



1872. Meekella, Meek. Palfeontology of Eastern Nebraska, p^ 175, pi v, fig. 12. 



1873. Meekella, Meek and Worthen. Geological Survey of Illinois, vol. \-, p. 571, pi. xxvi. 



fig. 21. 



1874. Meekella, Bayan. Bull. Societe Geol. France, Ser. 3, vol. ii, p. 412, pi. xvi, fig. 3. 



1875. Meekella, White. Wheeler's Rept. Expls. and Sui-veys West 100th Merid., vol. iv, pt. i, p. 126, 



111. ix, fig. 4. 



1883. Streptorkynchus (Meekella), Hall. Rept. N. Y. State Geologist for 1882, pi. xl, figs. 18-23. 



1884. Meekella, White. Thirteenth Report Slate Geologist Indiana, p. 130, jil. xxvi, figs. 12-14. 

 1884. Meekella, Davidson. General Summary of British Fo.ssil Brachiopoda, p. 379. 



1884. Meekella, Waagen. Salt-Range Fossils, vol. i, pi. iv, p. 576. 



Diagnosis. Shell robust, biconvex, often subpyramidal. Hinge-line straight 

 and shorter than the greatest width of the shell. On the pedicle-valve the 

 cardinal area is often greatly elevated and distorted; the delthyrium is covered ; 

 the convex portion of the deltidium being much narrower than the space 

 between the dental ridges. In the interior the teeth are prominent and sup- 

 ported by septiform dental lamellse which reach the bottom of the umbonal 

 cavity and extend forward for one-third or one-half the length of the shell. 

 The brachial valve has a full, gibbous umbo, and a rudimentary or linear cardi- 

 nal area. On the interior are two divergent lamellaB or crural plates, which 

 are extended forward for more than one-third the length of the valve, support- 

 ing a high, erect cardinal process, which sometimes reaches almost to the apex 

 of the umbonal cavity in the opposite valve. This process is a somewhat 

 curved, thin, crescentic plate, bearing on its summit two slender median 

 apophyses, below which are two stouter lateral projections having the form of ex- 

 tended, rounded lobes, which form the bases of the crura. Surface of the valves 



