46 BULLETIN OF THE LABORATORIES 



of the surface. 'I'he surface is also more convex. There are about 

 28 pliae, four being on the fold and those of the general surface are 

 simple, while those of the fold dichotomize. Tnis species is smaller 

 than S. stnatiformis. Division III, near Newark. W. F. Cooper, 

 collector. 



Spirit ev winchelli. sp. n. 

 (Plate V, Fig. 2-3; Plate II, Fig. 16.) 



Mcst nearly resembling S. mesacostalis. Shell transversely elon- 

 gate, gibbous ; width from two to three times the height. Ventral 

 valve quite convex mesially, strongly and evenly arched from the 

 closely incurved and projecting beaks to the lower margin. The area 

 is very narrow; hinge-line usually strongly produced, lateral angles 

 mucronate; surface marked by about 15 rounded plicas on either side 

 of the deep triangular sinus. (In one case a trace of slight fold in 

 the bottom of the sinus was discovered, but, as all our specimeris are 

 casts, these might not usually be preserved if present. Dorsal valve 

 less gibbous ; area very narrow, beak minute; surface most convex 

 near the middle ; fold high, strongly defined, narrow, marked in the 

 center by a deep groove. Surface ornamented by lamellose concentric 

 lines. The close relationship with S. mesacostalis of the Chemung 

 require no comment. If the strata were adjacent the two would hard- 

 ly be separated. A considerable number of closely agreeing speci- 

 mens were found in conglomerate II, at Granville. Named in honor 

 of the distinguished state geologist of Michigan. 



Spirifer sp (Cf. ^S'. raricosta, Con.) 



f Plate I, Fig. 5.) 



A small species of Spirifer, resembling Spiriferina somewhat, or 

 more nearly the species quoted above, is represented by the single 

 fragment from an unascertained portion of the Waverly. As the spe- 

 cies in question belongs to the corniferous horizon and ours has a 

 greater number of plicae, it is improbable that they should proue iden- 

 tical. 



