301 



Goniatites (Manticoceras) rhynchostoma. Clarke. 

 (Figs. 237, 238.) (Clarke: Naples Fauna, 16th Ann. Rep't 

 N. Y. State Geol., 1898, pp. 65, 69, Pis. IV., V.) 



Distinguishing Characters. — Greater size than in preceding 

 species at any corresponding stage in development ; lateral 

 slopes more convex, venter sharper at its periphery. Sutures 

 as in G. intumescens. 



Note.— The following figures (236, 238, 240), reproduced 

 from Professor Clarke's monograph, and representing 



Fig. 236. 



Fig. 238. 



Fig. 240. 



Figs. 236, 238, 240. Vertical sections through shells of M. intumescens, M. rhynchostoma 

 and M. sororium (after Clarke). 



vertical sections through adult shells, will show the char- 

 acteristic differences in outline between this species and that 

 preceding and that following it. 



The remarkable specimen figured by Clarke on Plate V. of 

 his Naples Fauna, and an outline of which is here reproduced, 

 was found with others (depicted on Plate IV.) in the Naples 

 shales of Big Sister Creek, near Angola, N. Y. 



Goniatites (Manticoceras) sororium. Clarke. (Figs. 

 239, 240.) (Clarke: Naples Fauna, 16th Ann. Rep't N. Y. 

 State Geol., 1898, pp. 75, 76, PL IV.) 



