90 BULLETIN OF THE 



Loc. England, Tours, Weimar, Bantz, Uhrweiler, and Bas-I!liin ; Coll. 

 Sir C. Lyell, M. Boucault, Bronn, Ur. Krantz, and L. Agassiz. 



Sub-Genus No. 2. 

 Sides of whorls partially covered and flatter, especially in the young. 



Pleuroceras pseudo-costatum Hyatt. 



Amm. costatus nudus Quens'dt, Die Ceph., p. 95. 



Amm. costatus nudus Quens'dt, Der Jura, p. 171, pi. 21, fig. 3. 



Loc. Yeovil, Duinbleton near Cheltenham, Itogueport, Canal du Danube, 

 Plateau de Larzac, Goslar, Gundershofen, Baiern ; Coll. Bronn, L. de Ko- 

 ninck, and Dr. Krantz. 



Pleuroceras pseudo-spinatum Hyatt. 



Amm. costatus spinatus Quens'dt, Der Jura, p. 1 71, pi. 21, fig. 1-3. 

 Amm. costalus spinatus Quens'dt, Die Ceph., p. 95, pi. 5, fig. 10. 

 Loc. Yassy (De'p. Yonne), Milhaud (Dep. de l'Aveyron), and Courcy ; 

 Coll. Boucault and L. de Koninck. 



Pleuroceras vittatum Hyatt. 



Amm. viltatus Phil. Geol. York., .p. 101, pi. 13, fig. 1. 

 Loc. Whitby; Coll. Dr. Krantz. 



Amaltheus De Montfort. 

 Ablomen acute, keeled, and channelled ; whorls compressed laterally. 

 Keel crenulated, well defined. Tubercles, when present, are in a single 

 row along the line of envelopment. Umbilicus open, with the sides of the 

 whorls exposed or only partially covered. 



Amaltheus gloriosus Hyatt. 



Amm. amaltheus coronatus Quens'dt, Der Jura, p. 169, pi. 20, figs. 9-12. 

 Loc. Milhaud, Balingen, Pliensbach, Boll, and Ofterdingen ; Coll. L. de 

 Koninck, Bronn, and Dr. Krantz. 



Amaltheus salebrosus Hyatt. 



Amm. amaltheus spinosus Quens'dt, Die Ceph., p. 95, pi. 5, fig. 4. 



Amm. amaltheus spinosus Quens'dt, Der Jura, p. 108, pi. 20, fig. 8. 



Loc. Whitby, Semur, Strasburg, Miihlhausen (Bas-Rhin), Pliensbach, 

 Boll, Geyslingen, Balingen, and Gundershofen ; Coll. Dr. Krantz, Boucault, 

 Bronn, L. Agassiz, and L. de Koninck. 



Amaltheus turgidus Hyatt. 



.1//;??). Amaltheus gibbosus Schlot., Pet. p. 10. 



Amm. Amaltheus gibbosus Ziet., Yerst. Wiirt., p. 4, pi. 4, fig. 2. 



