Mow. 



410 



112. 



Modilopsis nasuta. ( Cypricardites modiolar is and nasutus. 



Emmons, page 403, fig. 112, 4, 

 Loraine {Hudson river) forma- 

 tion^ (Conrad, Ann. Et. N. Y. 

 1841.) Like Pterinea carinata 

 it occurs only in this formation, 

 and is never seen in the Tren- 

 ton or Utica (Emmons).— /// 5. 



Modiolopsis nais, Billings. Geology of Canada, 1863, p. 

 143, fig. 81 a {See under M, maia above) right valve ; b dorsal 

 view. Trenton group II c. 



Modiolopsis perlatus, Hall, 28th Kt. N. Y. Museum, Doc. 



Ed. 1876, pi. 27, figs. 3, 4, copied into 

 Collett's Indiana report of 1881, p. 

 315, pi. 28, fig. 3, right valve char- 

 acteristic of the species ; fig. 4 hinge 

 view showing its great convexity or 

 roundness. — Niagara^ Vh. 



Modiolopsis pholadiformis, 



Hall. See Appendix. 



Modiolopsis rhomboidea, Hall. Dawson's Acadian Ge- 

 V-vi ^ — ^ 2oiology, 1868, p. 600, fig. 203 ; surface evenly 



striated, concentrically; front muscular scar 

 very strong, back scar less so but still very 

 conspicuous and subduplicate ; some resem- 

 blance to M. priniige7iius { Unio primigenius., Conrad, Ann. 

 Rt., N. Y., 1838, Medina sandstone).^ but less ventricose in the 

 middle. &c. Arisaig, Nova Scotia. — Vf 



Modiolopsis truncata, Hall. See Appendix. 



Modiolopsis subalatus, Hall. Pal. N. Y., Vol. 2, 1852, 



plate 27, figs. 5, 

 6; 28th An. Rt. 

 of Museum, 1879. 

 Collett's Indiana 

 report of 1881, 

 /•-qy\ p. 315, plate 28, 

 fig. 5 J left valve of a form closely resembling the M. subalatus 



JDdW. 



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 Mm 



