LOWER HELDERBERG ROCKS. 195 



in these rocks. The form is not unlike S. woolworthana, but it is much more conVex, 

 the greatest convexity being in the middle, while in that it is near the front. This 

 one is not flattened near the umbo as is that species, and it differs moreover in the 

 character of the striae. 



Fig. 13. The dorsal valve. Fig. 14. Profile view of the same. 



Geological position and locality. In the Pentamerus limestone of the Lower Hel- 

 derberg group : Schoharie. 



Strophomena ingosa*. 



Plate XIX. Fig. 1 a - y. 



Dritte Anomiten art mit breiter schlosskante : Hopscn, Naturgeschichte des Neiderdeutschland, 1781, 

 Vol. i, pa. 15, pl.l, f.7&8. 



Anonata rhomboidalis : Waulenbebg, Acta Soc. S. Upsaliensis, 1821, Vol.viii, pa. 65, n° 7. 



Produda depressa : Sowebbt, Genera of Shell.s; and Min. Conchology, 1825, Vol. v, pa. 86, pi. 459, 



f.3. 

 ■p. rugosa : IIisinger, Vet. Acad. Handlingar, 1826, p. 33. 



Produdus depresrus : Defranc, Diet, des Sciences naturellcs, 1826, Vol. xlvii, p. 353. 



LepUtna rugosa : Dalman, Vet. Acad. Handlingar, 1827, pa. 106, pl.l, f. 1. 



[t. depressa : Id. lb., pa. 107, pl.l, f. 2. 



Slrophotnena rugosa : Bronn, Leth. geognostica, 1825, Vol.i, pa. 87, pi. 2, f. 8. 



Produeta depressa : Phillips, Geol. Yorkshire, 1846, Vol. ii, pa. 215, pi. 8, f. 18. 



Produdus depressv3 : Deshates, Lamarck Animaux sans vertcbrcs, 2d edition. Vol. viii, p. 380. 



Leptftna rugosa and L. depressa : Hisinger, Leth. Suecica, 1837, pa. 69, pi. 20, f. 2 & 3. 



Ortkis rugosa : VoN BccH, Ueber Delthyris, 1837, p. 30. 



Leptftna : Fischer, Oryct. du Gouvcrnement du Moscou, 1837, p. 143. 



Leptana depressa : S. Sowerbt, in Murchison Sil. System, 1839, pa. 623 & 636, pi. 12, f. 2. 



L. tenuUtriata [ ? ] : Id. lb., pa. 646, pi. 22, f. 2 a. 



L. rugosa : Id., Trans. Geol. Soc. London, 1840, 2d series. Vol. v, pi. 56, f. 4. 



Orihis rugosa : Eichwald, Sil. System in Esthland, p. 162. 



Leptftna rugosa : Phillips, Pal. Fossils, 1841, pa. 57, pi. 24, f. 95. 



L. depressa : De Koninck, Desc. An. Fossiles de Belgique, 1842, pa. 215, pi. 12, f. 3 - 6; and 



pi. 13, f. 6. 



— — G. B. Sowerbt, Conch. Manual, 1842, pa. 71 & 300, f. 206. 



* Strophomena rhomboidalis :" tfommi Conchitet rhomboidalis, Anomia inequilateri, par C. Wilckkns 

 Nachricht von scltcner versteincningen, pag. 79, tab. viii, f. 43, 1769. = Leptana depressa, Sowebby, 

 which is also the Anomites rhomboidalis of Wahlenbebq, D'Orbiony, 8tc." — Note on page 137 of the 

 French edition of Davidsok's Introduction to the Study of the Brachiopoda. 



I leave the name Strophomena rugosa preceding the description of this species; believing this to be the 

 typical species of Rafinesque's Genus Strophomena, and as such it has always been recognized by 

 American palaeontologists, though we have no published description or figures for reference. 



Among some shells and fossils purchased by Mr. Foulson of Philadelphia, from Professor RAFiHESQeE's 

 collections, there are specimens of this species, labelled, in the handwriting of the latter, Strophomena 

 rugota ; leaving no doubt as to the true intention and application of this name by its author. 



