io6 



NORTH AMERICAN INDEX FOSSILS. 



whorls; suture with ventral and lateral lobe, and dorsal V-shaped 

 lobe, ventrolateral and dorsolateral saddles. Missippic-Carbonic. 



134. R. clarkense Miller and Gurley. (Fig. 1334.) Mississippic. 



Fig. 1334. Remeleoceras clarkense, M. & G., X Yii lateral, dorsal and ventral 

 views. (After Miller and Gurley, Bull. 12, 111. State Mus.) 



Whorls regularly and rather rapidly enlarged; venter and sides 

 flattened, non-ornate. 

 Knobstone of Indiana. 



L. DiODOCERAS Hyatt. 



Nautilicones with young (neanic) as in the adult of arcuate Trip- 

 teroceras, with ventral saddles, faint lateral lobes, and minute shal- 

 low, dorsal lobe. Dorsal contact furrow begins in the neanic; 

 siphuncle small, changing from subventran in young to ventro- 

 centren in adult; whorls markedly digonal; surface smooth. 

 Carbonic. 



135. D. avonense Dawson. Carbonic. 



Whorls much flattened dorso-ventrally, slightly angulated at 

 inner edge ; siphuncle near ventral margin ; septa convex, about 

 ys inch apart. 



Common in Windsor limestone of Nova Scotia, also at Joggins. 

 Nova Scotia. 



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