JVc'iv Sj)ccie.^ of Fossih froDi Ohio. "^IT 



PalseoiieKo siinilis, n. sp. 



Pal. O., Vol. Ill, Plate 8, Figs. 4 and 5. 



Shell oblong, with nearly equally rounded extremities, and almost parallel 

 dorsal and ventral margins. Anterior end short, a little narrower than the 

 body' of the shell, resulting from the constriction below the beaks. Pos- 

 terior end rounded, with a slight oblique truncation below the middle of 

 the height, corresponding to the very shallow umbonal sulcus of the valves. 

 Beaks situated within the anterior third of the length of the shell, small 

 and enrolled. Valves ventricose, most prominent just below the umbones, 

 and slightly sulcated along the posterior slope. The surface of the shell, so 

 far as can be determined from the matrix, has been smooth or without visi- 

 ble markings. On the internal cast, the condition in which the specimens 

 are found, the muscular imprints are faintly marked — the pedal muscles 

 being the most distinct. 



The species is closely related to /-*. {Leda) Barrisi, White 

 and Whitf., Proc. Bost. Soc. Nat. Hist, Vol. 8, p. 29S,{Palaeo- 

 neilo Barrisi (W. and W.), H. & W., Pi'elim. notice of Lam. 

 Shells of the Up. Held., Hamilton and Chemitug groups, etc.,), 

 but has been somewhat more nearly }->arallel on the margins, and 

 has a smoother shell. 



Formation and Locality. — In the calcareous concretions of the 

 Erie shale, at Leroy, Lake Co., Ohio, accomjianying the fossil 

 entomostracan from the same locality (next described). 



CIRRIPEDIA. 

 Plumulites J\'eAVtocrryi, n. sp; 



Pal. O., Vol. Ill, Plate 8, Figs. 6—11. 



The specimens for which the above specific name is proposed, 

 consist of several detached plates, and of one of several plates, 

 irregularly folded together in such a manner as to be difficult 

 of interpretation. The several plates vary considerably in form 

 among themselves, and probably represent those from different 

 parts of the body. 



The general form of the plates is triangular, with the apex, or 

 initial point of growth, a little inclined to one side ; the base, 

 or margin of accretion, is usually the longest side, but not in all 

 cases. One set of plates has the shorter sides diverging at nearly 

 right-angles. On this form, the basal line is convex for more 

 than two-thirds its length, and concave on the remaining por- 



