58 PALEONTOLOGY OF NEW YORK. 



a deep sinus on the brachial valve, and also a corresponding sinus on the 

 opposite valve. Kach valve is divided externally by two strong divergent 

 ridges, into three depressed areas, one central and two lateral. Quenstedt, 

 considering both species identical, erected for their reception* a special sub- 

 division of his Aperturati, viz., Cincta. The hinge is long and the cardinal areas 

 on both valves well developed ; the surface is smooth or covered with fine con- 

 centric lines. Little is known of the interior, but it appears from Quenstedt's 

 description that a cardinal process is well developed and that the shell con- 

 tains spirals similar to those of Spirifer. 



It is very evident that, in association with this most peculiar exterior which 

 of itself necessitates a separation of these species from Spirifer, will be found 

 other peculiarities not pertaining to any of the subdivisions of that genus here 

 adopted. To render the classification of the spiriferoids more homogeneous we 

 propose for this aberrant group the designation Verneuilia (see plate xxxix). 



Genus WHITFIELDELLA, nom. nov. 



PLATE XLVIU. 



1828. Terebraluia, Dalman. Kong. Vetenskaps-Akad. Handlingar, pi. vi, fig. 7. 



1842. Atrypa, Vakoxkm. Geology of N. Y. ; Kept. Third Dist., p. 112, fig. 5. 



1843. Atrypa, Hall. Geology of N. Y. ; Rapt. Fourth Dist., p. 71, fig. 3; p. 142, fig. 5 j Tables of 



Organic RemainB, No. 13, fig. 5. 

 1852. Atrypa, Hall. Paleontology of N. Y., vol. ii, pp. 9, 76, 77, 260, 268, 269, 328, pi. iv, figs. 4, 5 ; 



pi. xxiv, figs. 1-4, 6 ; pi. Iv, figs. 1, 2, 4 ; pi. Ixxiv, fig. 10. 

 18R6. Atrypa, BiLLi»as. Canadian Naturalist and Geologist, vol. i, p. 137, pi. ii, fig. 9. 

 1858. Atrypa, Rogkbs. Geology of Pennsylvania, vol. ii, part ii, p. 823, fig.'634. 

 1869. Merista, Hall. Pulteontology of N. Y., vol. iii, p. 253. 

 1869. Merista, Hall. Twelfth Rept. N. Y. State Cab. Nat. Hist., pp. 77, 78. 



1862. Athyris, Charkmdlaf, Billings. Palseozoic Fossils, vol. i, p. 146, fig. 124 j p. 166, fig. 150. 



1863. AthyrU, BtLusae. Geology of Canada, p. 317, figs. 320, 332-334. 

 1863. Meristella, Hall. Transactions of the Albany Institute, vol. iv, p. 226. 

 1867. MerUtina, Hall. Paleontology of N. Y., vol. iv, p. 299. 



1867. MerUtella, Davidson. British Silurian Bracbiopoda, p. 112, pi. xxi, figs. 1-10. 



1868. Athyrist, McCnsgNBT. Ti-ans. Chicago Acad. Science, vol. i, p. 33, pi. viii, fig. 2. 

 1873. MerUtetla {f Merittina), Mbbk. Paleontology of Ohio, vol. i, p. 180, pi. xv, fig. 2. 

 1873. Athyris, Nichouson and Hindb. Canadian Journal, vol. xlv, new ser., pp. 144, 157. 



1875. Athyris, Nicholson. Palaeontology of the Province of Ontario, p. 61, fig. 32o ; p. 62, fig. 32e. 



1879. Meristina, Hall. Twenty-eighth Rept. N. Y. State Mus. Nat. Hist., p. 160, pi. xxv, figs. 1-7. 



1882. Meristina, Davidson. British Silurian Brachiopoda, Supplement, p. 94, pi. iv, figs. 20-23. 



1882. Meristina, Hail. Eleventh Rept. State Geologist of Indiana, pp. 300, 301 ; pi. xxv, figs. 1-7. 



* Petrefact«nkunde Deutschlands; Brachiopoden, p. 610, pi. liii, figs. 70-72. 1871. 



