FOSSILS OF THE COAL MEASURES. 593 



their identity. The specimen from which our drawing was made has 

 the callous of the inner lip a little thicker above, and the columella 

 rather more sinuous below, than the typical specimen of N. Prim, but 

 these are variable characters in different individuals of the same spe- 

 cies in this genus. 



The most perplexing question in regard to this shell is respecting its 

 relations to 3". rentrica, of Xorwood and Pratteu. On comparison with 

 their figure and description, the shell we have figured will be seen to 

 differ widely in nearly all its characters. Yet we are assured by Prof. 

 E. Cox that this particular specimen is the original type of N. ventrim, 

 and that it was loaned by him to XORWOOD and PRATTEX for descrip- 

 tion and illustration. It seems scarcely possible, however, that the 

 figure and description of N. rentriea could have been made from this 

 individual specimen, and hence we think Prof. Cox may possibly be 

 mistaken on this point, notwithstanding the fact that he loaned this 

 specimen to Messrs. X. and P. 



It is worthy of note, however, that Dr. SHUMARD describes the N~. 

 Pried as being ventricose in young examples, and differing materially 

 in form from the adult. Hence we suspect that NORWOOD and PRAT- 

 TEN'S type was a well grown young individual of the same species as 

 that we have figured, and hence not distinct, specifically, from the sub- 

 sequently named JV. Prk-ei. At any rate we are assured by Prof. Cox 

 that the form we have figured is the only one known to him from any 

 locality near Xew Harmony, while we have before us two other good 

 specimens from the locality one mile south of Xew Harmony, cited by 

 XORWOOD and PRATTEN, and these agree exactly with that we have 

 figured. 



Position and locality One mile south of New Harnioiry, Indiana; 

 from the upper part of the Coal ."Measures. 



Genus MACROCHEILUS, Phillips. 

 MACROCHEILUS ALTO^EXSIS, Worthen Ms. 



PI. 28, Fig. 8. 



SHELL about the medium size, elongate-subovate, spire 

 conical, forming about two-fifths the entire length of the 

 shell, pointed at the extremity ; volutions five or six, in- 

 creasing moderately in si/e, last one not ventricose, widest 

 just above the middle; columella provided with a thick 

 rounded callosity, contracted at the upper extremity, and 



