PALAEONTOLOGY OF NEW-YORK. 
T« 
Genus Strophomena (Rafinesque). 
The Genus Strophomena of Rafinesque has for its type the S. rugosa = 
S. rhomboidalis, W ahlenberg ; a species which ranges from the Lower Si¬ 
lurian to the base of the Carboniferous system inclusive, appearing under 
various aspects in the successive geological stages. The species has been 
already fully illustrated in the preceding volumes of this work, and it is 
only necessary to give the more important among the varieties of form 
in the succeeding formations. 
Restricting the genus to such forms as may properly be grouped with 
the typical species, we find no species of Strophomena proper in the 
Devonian; and indeed it may be doubted whether any other species of 
this genus occurs above the Middle Silurian. 
strophomena rhomboidalis. 
PLATE XII. 
Dritte Anomiten art mit breiter schlosskante : Hupsch, Naturgeschichte des Niederdeutschland. 1781, 
Vol.i, pa. 15. pl,l, f. 7 & 8. 
Jlnomites rhomboidalis : Wahlenberg, Acta Soc. S. Upsaliensis, 1821, Vol.viii, pa. 65, n° 7. 
Producta depressa ; Sowerby, Genera of Shells; & Min. Conchology, 1825, Vol.v, pa. 86, pi.459, f.3. 
Producta dapressa : Hisinger, Vet. Acad. Handlingar, 1826, p. 33. 
Productus depressus : Defrance, Diet, des Sciences naturelles, 1826, Vol.xlvii, p.353. 
Leptcena rugosa, : Dalman, Vet. Acad. Handlingar, 1827, pa. 106, pi. 1, f. 1. 
Leptcena depressa : Id. Ib., pa. 107, pi. 1, f. 2. 
Strophomena rugosa : Bronn. Leth. geognostica, 1835, Vol. 1, pa. 87, pi. 2, f. 8. 
Producta depressa : Phillips, Geol. Yorkshire, 1836, Vol. ii, pa. 215, pi. 8, f. 18. 
Productus depressus : Deshayes, Lamarck animaux sans vertebres, 2d edition, Vol. viii, p. 380. 
Leptcena rugosa and L. depressa : Hisinger, Leth. Suecica, 1837, pa. 69, pi. 2, f. 2 & 3. 
Orthis rugosa : Von Bucii, Ueber Delthyris, 1837, p. 30. 
Leptcena : Fischer, Oryct. du Gouvernement du Moscou, 1837, p. 142. 
Leptcena depressa : J. Sowerby, in Murchison Sil. System, 1839, pa. 623 & 636, pi. 12, f. 2. 
L. tenuistriata [?] : Id. Ib., pa. 646, pi. 22, f. 2 a. 
L. rugosa : Id., Trans. Geol. Soc. London, 1840, 3d series, Vol.v, pi. 56, f. 4. 
Orthis rugosa : Eichwald, Sil. System in Esthland, p. 162. « 
Leptcena rugosa : Phillips, Pal. Fossils, 1841, pa. 57, pi. 24, f. 95. 
Leptcena depressa : De Koninck, Desc. An. fossiles de Belgique, 1842, pa. 215, pi. 12, f. 3 - 6; and 
pi. 13, f. 6. 
Leptcena depressa : G. B. Sowerby, Conch. Manual, 1842, pa. 71 & 300, f. 206. 
Orthis rugosa : D’Archiac et De Verneuil, Trans. Geol. Society London, 1842, 2d series, Vol. ii, 
part 2, p. 396. 
