106 PAL^ONTOLOer of OHIO. 



Genus PLTJMULITES, Barrande ; Turrilepis, Woodward. 



Among the fossils from Cincinnati, received from U. P. James, Esq., 

 are several detached plates of a species of the above named genus of 

 Cirripedes. The specimens are minute, and mostly too imperfect for 

 figuring. In examining other collections of fossils from the same place, 

 a few imperfect fragments only have been detected. We are, therefore, 

 able to give only an imperfect description of the species. 



The specimens referred to appear to be the first of the genus recognized 

 in this country, although long known in Europe, where they have at- 

 tracted the attention of several eminent naturalists. They were for 

 many years supposed to belong to the family Chitonidai, and were so re- 

 ferred and described by M. L. de Konitick (Bui. de I'Acad. Royale des 

 Sci., 1857), but in the Quart. Jour. Geol. Soc. London, 1865, p. 486, Mr. 

 Henry Woodward refers them to the Cirripedia, under the generic 

 name of Turrilepis there proposed, giving very clear reasons for consider- 

 ing them as Cirripedes, and not Chitons. 



In the supplementary volume of the Crustacea of the Silurian System de 

 la Bohemia, the author describes several species under the generic name 

 of Plumulites, not recognizing Woodward's genus, as its characters were 

 not defined or described by the author. 



As the species now described is known only from detached plates, we 

 have given an outline of a figure copied from Mr. Woodward's article 

 above cited, to aid in giving a better idea of the general form than can 

 be derived from the specimens examined. The general form of the body 

 appears to have been elongate ovate, or elliptical, and is composed of 

 four or more ranges of imbricating plates of a somewhat triangular 

 form, the whole somewhat resembling in appearance and character a 

 loosely arranged pine cone imbedded in the rock. The body has prob- 

 ably been furnished with a short pedicle at the lower extremity, but no 

 evidence of such an appendage has yet been discovered. 



Plumulites Jamesi (n. sp.). 



Plate 4, figs. 1-3. 



General form of plates triangular, with the apex a little inclined to 

 one side, the lateral margins gradually and rapidly diverging from the 

 initial point, one of them considerably longer than the other. Basal 

 margin sigmoidal, the convex portion situated next to the longest lateral 



