MUSEUM OF COMPARATIVE ZOOLOGY. 77 



Diseoceras spiratissimum Hyatt. 



Amm. arietis Ziet., Verst. Wiirt., p. 3, pi. 2, fig. 3, not figs. 2 and 4* 

 Amm. spiratissimus Quens'dt, Hand. Pet., p. 355, pi. 27, fig. 9. 

 Loc. Filder, Vaihingen, Metzingen, Hohcnheim, and Stuttgart ; ColL 

 De Koninck, Dr. Krantz, Mus. of Stuttgart, and Boucault. 



Diseoceras Conybeari L. Agassiz. 



Amm. Conybeari Sow., Min. Conch., v. 1, p. 70, pi. 131. 

 Amm. obliquecostatus Ziet., Verst. Wiirt., p. 20, pi. 15, fig. 1. 

 Amm. Conybeari Ziet., Verst. Wiirt., p. 35, pi. 2G, fig. 2. 

 Amm. Conybeari D'Orb., Terr. Jurass., I., p. 202, pi. 50. 

 Amm. Conybeari Ilauer, Ceph. d. Lias d. Nordiistlichen Alpen, p. 16, 

 pi. 2, figs. 1-6. 



Loc. Semur, Waltzing, and Balingen ; Coll. Boucault and L. de Koninck. 



Coronicerast Hyatt. 



Keels prominent, constant ; channels well-defined. Pihe tuberculated 

 and bent. Umbilicus open. Sides of the whorls exposed. 



Pila; preceded by a line of tubercles in the young, which gradually elon- 

 gate to form the tuberculated pilae of the adult. Ventral lobe deep and 

 narrow. Lateral lobes unequally divided. Superior lateral cell irregu- 

 larly divided ; abrupt on the siphonal side ; sloping rapidly on the opposite 

 side. Inferior lateral cell exceedingly variable in form, but unequally 

 divided. 

 Coroniceras latum Hyatt. 



Loc. Semur and Tubingen ; Coll. Boucault and Dr. Krantz. 



Abdomen very broad, overhanging. Tubercles prominent. Keel varies 

 from thick to attenuated ; and channels, from well-defined to almost 

 obsolete. Septal lobes broad and shallow, irregularly divided. Superior 

 lateral cell upon the abdomen. Inferior lateral cell broad and short. 



Coroniceras kridion Hyatt. 



Amm. kridion Held. Ziet., Verst. Wiirt., p. 4, pi. 3, fig. 2. 



Amm. kridion Quens'dt, Der Jura, p. 70, pi. 7, fig. 8. 



Loc. Semur and Stuttgart ; Coll. Boucault and Mus. of Stuttgart. 



Coroniceras bisulcatum Hyatt. 



Amm. bisulcatus Brug., Ency. Meth., v. 1, p. 39, pi. 13. 



Amm. bisulcatus D'Orb., Terr. Jurass., p. 187, pi. 43. 



Loc. Semur and Balingen ; Coll. Boucault and De Koninck. 



* Figs. 2 and 4 have already been referred to OpMoceras Johnstoni. 

 t Kopavls, a crown. 



