FOSSILS OF THE NIAGARA GROUP. 433 



SUBULITES VENTRICOSUS, HaLL. 



(Page 398.) 



Subulites brevis, W. & M., may prove a distinct species. Should the 

 want of symmetry be found a constant feature, the specific distinction 

 should be maintained. 



Orthoceras annulatum, Sowerbt. 



(Page 411.) 



Prof WiNCHELL, in referring specimens of the above species to the 0. 

 nodocostum of M'Chesney,* says, " No annular strige can be seen on our 

 specimens. The longitudinal ridges are barely discernible on the shell, 

 and leave no trace upon the cast." The figure of Mr. M' Chesney repre- 

 sents annular sti'ise upon his specimens, and I have never seen the shell 

 without these markings ; and the casts, or partial casts, usually show the 

 longitudinal ridges more distinctly than the shell. 



I have received from Prof. Winchell a gutta-percha cast, under the 

 name 0. nodocostum ; and I have likewise had an opportunity of examin- 

 ing, in Prof. Marcy's collection, the matrix from which this cast was 

 taken. This matrix, although obscured by the crystalline matter which 

 has taken the place of the shell, nevertheless preserves the marks of 

 annular striae, quite as distinctly as it does the longitudinal ridges or 

 nodes. 



Ill^nus armatus. Hall. 



(Page 41S.) 



Specimens communicated by Prof. Winuhell under the name of lllcenus 

 worthenanus, are the glabellae of the above species, and one part of a gla- 

 bella of Ceraurus with hypostoma attached, which is probably the 

 hypostoma described on page 105, vol. i, Mem. Bost. Soc. Nat. Hist. The 

 pygidium accompanying these, under the same name, is apparently 

 the one described on page 105, and belongs to /. armatus. In the collec- 

 tions of Prof Marcy there are several glabellse and imperfect heads of 

 /. armatus, and a very good head of I. insignis ; all of which were com- 

 municated under the name lllcenus worthenanus. 



LiCHAS PUGNAX, WiNCH. AND MaR. 



The representation of the pygidium by Prof. Winchell is very unfor- 

 tunate. The third or posterior annulation of the figure is the anterior 



* 0. nodicostatum, as corrected in Transactions of the Chicago Academy of Sciences. 

 Cab. Nat 55 



