KONGL. SV. VET. AKADEMIENS HANDL. BAND. 19. N:0 6. 



203 



Nassacites Kruger 1823, Gescli. der Urwelt 

 Th. 2, 417. -- Machrochilina? 



Natica Adanson 1757, Senegal., 172. D'Or- 

 BiGNY and PiCTET consider that this 

 genus is represented in the Silurian 

 formation, probably = Platyceras. 



Naticella Swainson 1840, Malac., 345. There 

 are species referred to this genus de- 

 scribed from the Silurian and Carbo- 

 niferous formations, but probably be- 

 longing to other genera. 



Naticodon De Ryckholt 1852, Melanges 

 paleontologiques, 75, in Mem. Cour. 

 Acad. R. d. Sci. de Belgique Ire pt., 

 75. Carboniferous. 



Naticopsis Mac Coy 1844 Synops. Carbo- 

 nif. Spec, of Ireland, 33. 



Natiria De Kun. 1881, Faune Calc. Carbo- 

 nif. Belg. II, ni, 5. 



Nerita L. 1758 S. N. ed. X, 776, N. hali- 

 otis Sow. Sil. Syst. = Platyceras. 



Neritoinopsis Waagen 1880, Pal. Ind. XII, 

 106. 



Niso Risso 1826, Hist. IV, 218. Employed 

 by De Koninck in Fossiles Pal. de Nouv. 

 Galles du Sud 1876, 127, for a Devo- 

 nian species. 



Odontomaria Ferd. Roemer 1876, Leth. 

 Geogn. 1 Theil. Taf. 29, f. 10, Devonian. 



Omphalotrochus Meek 1864, Rept. Geol. Surv. 

 California. Pala!ont. vol. 1, 16. Rela- 

 ted to Oriostoma, not a Pleurotoma- 

 rian as De Koninck thinks. 



Onychochilus Lindstrom 1884, Silurian Ga- 

 stropoda of Gotland, 196. 



Ophileta Vanuxem 1842, Geol. N. Y. vol. 

 Ill, 36. 



Oriostoma Munier-Chalmas 1876, Journal 

 de Conchyl. vol. XVI, 103. Comprises 

 several palneozoic forms which have 

 been regarded as Euomphali, without 

 being provided with the characteristic 

 slit in the aperture. 



Orthoneina Meek & Worthen 1861, Proc. 



Acad. N. Sc. Philad., 146, Carbonife- 

 rous. 

 Orthonychia Hall 1843, Rept. 4th Distr. N, 



Y. Geol. Surv., 172. A division of 



Platyceras. 

 Orthostomd. Conrad 1838, Ann. Rejj. N. Y., 



119. Perhaps a disjointed Euompha- 



lus, perhaps a Cephalopod. 

 Pahmcmcea Hall 1873, 23d Rept. N. Y. 



St. Cab., 242. 

 Faheotrochus Hall 1879, Pal. N. Y. vol. 



V, pt. II, 133. 



Patella L. 1758, S. N. ed. X, 780. 



Patellostium Waagen 1880, Pal. Ind. XII, 

 131. One of the Bellerophons. 



Phanerotinus Sow. 1844, Min. Conch, vol. 

 VII, 29. A vei-y interesting form with 

 disjointed whorls, piano-spiral and a 

 large cristate lamina along the dorsal 

 side. Is it related to the alate Pleu- 

 rotoraarias? 



Phasianella Lamk 1804, Ann. du Museum, 

 IV, 295. According to Waagen Pal. 

 Indica XI 1, 109, Carboniferous. 



Phorus MoNTFORT 1810, Conch. Syst. II, 158. 

 According to Eudes-Deslongchamps, 

 Bullet. Soc. Linneenne de Normandie 



VI, 146 there is a Devonian species. 

 Phragmolithes Conrad 1838, Rept. ISf. Y. 



Geol. Surv., 119. = Cyrtolites. 



Phragmostoma Hall 1861, 14th Rept. N. Y. 

 State Cab., 94. 



Phymatifer De Koninck 1881, Faune II, iii, 

 149. Related to Porcellia. 



PileopsishK^iK 1812, wExtrait d'un Cours" etc. 

 according to Herrmannsen Index II, 

 268. Anim. sans Vertebr. 1822, vol. 6, 

 2 p. 16- The fossil species of Lamarck 

 are tertiary, the majority is recent. 



Pilidion Barrande 18G5, according to BiGS- 

 BY. Thes. Silur. 161, 168. 



Pithodea De Koninck 1881, Faune II, in, 88. 



