662 



MOLLUSCA 



PHYLUM VI 



Goeloceras {Deroceras Hyatt) (Fig. 1279), Dadylioceras (Fig. 1280) trndPeronoceras 



Hyatt ; Pimelites and Diafhorites Fuciiii ; 

 (?) Praesphaeroceras Levi ; (?) Gollina Buckm. 

 Middle and Upper Lias. 



Subfamily B. Stephanoceratinae 

 Steinmann. 



Primitive radicals, liiglily coronate, dis- 



coidal, giving rise apparently to involute and 



partially compressed forms that in Macro- 



cephalites and some others are without tubercles. 



Venter always rounded, costae bifurcating on 



the sides and continuous across the venter. 



Fi<;. 1280. Only one line of nodes or tubercles at the 



Dactylioccnui commune (Sov/h.). Upper Lias ; umbilical shoulders, and the division of costae 

 England. ' 



Pig. 12S1. 



Sphaeroceinshronfjniarti (Sowb.). Inferior 

 Oolite ; Bayeux, Calvados. 



Fu;. liiiS'J. 



Normannitcs bniikenrklgci (Sowb.). In- 

 ferior Oolite ; Bayeux, Calvados, i/i- 



takes place along these lines in most forms. Sutures of the same type as in Dacty- 



Fifi. 12S3. 



Macrorephnlltcs mcwroccphdus (Scliloth.). Upper Do,CK'er (CalloviaTi) ; EliniiiKen, Wiirtcniberg. 



lioidinae, but iiuRh more complex, witli usually more inflections, and lobes and saddles 



