297 





Fig. 331. Gonuitites uniaiiguhd'is, and .suture 

 (after Hall). 



is ineliuled a distinct saddle 

 of semi-elliptical fonn, some- 

 times with a sub-acute 

 apex ; ventral lobe narrow- 

 ly triangular, penetrating' 

 about one- third the depth of 

 the preceding air chand)ei'. 



Found in the I'leurodic- 

 tyum beds of Wanakah Cliff 

 (rare). 



The V a 1' i e t y obe s u m , 

 Clarke, characterized by 

 "much greater thickness and tumidity of the whorls," and 

 the variety conijnvssuin, Clarke, "laterally compressed 

 shells, with a sub-angular periphery," are cited by Clarke 

 from Erie County. (Naples Fauna, p. 116.) 



The former occurs on the Lake Shore, and the latter in the 

 Hamilton shales, at Wende Station. (See C. E. Beecher, Am. 

 Journ. Sci., Vol. XL., pp. 71-75, PI. I., 18V)0.) 



GOXIATITES (TORNOCEKAS) BICOSTATUS. Hall. (Fig. 2H2.) 



(Pal. N. Y., Vol. v., Pt. H., p. 4:7)0, Pis. LXXH., LXXIV. 

 Clarke: Naples Fauna, p. 118. ) 



DmtingiiMiing Characters. — Discoidal form of adult; 

 b r o a d 1 y c o n V e X o r fi a t 

 venter: closed umbilicus 

 (only in last volution): 

 "about the ventral periph- 

 ery runs a pair of low re- 

 volving grooves, one on 

 either side, without which 

 are rather low hyponomic 

 ridges'"; surface ornamen- 

 tation of concentric lines, 

 curving broadly backward over the lateral slopes, sharply 

 forward on the hyponomic grooves, and backward, "in a 

 deep linguiform festoon," on the venter; lateral lobe of 

 suture more prominent and luore isolated than in preceding 



Fig. 233. Goniatites bicostatxis. Ventral 

 and lateral views of immature individuals, 

 Naples shales, Erie County, N. Y. (after 

 Clarke). 



