297 



noch eine Differenz, dass Cope angiebt: „The flat surfaee is only 

 finely rugose"-', denn bei c|em mir voiliegenden Rostrum ist die 

 Sciilptur ringsum gleichmässig stark entwickelt, und es ist wohl 

 nicht anzunehmen, dass die ganze distale Plälfte fehlt. 



Ueber die zweite Species (E. penetrans) sagt (Jope (1. c., 

 p. 822) Folgendes: „The second species. which J call E. pe- 

 netrans, has a snout of uniformly oval section at all points. 

 The long diameter of the section is transverse. The axis is 

 straight and the form acuminate, the contraction being uniform 

 and gradual to acute apex. Thus it follows that a beak of 

 greater diameter at the base than one of the E. nitida has a 

 more slender shaft. The teeth of the inferior basal pair are, 

 in the specimen described. of large size, and, as in other species, 

 smooth, compressed. and with opposite fore and aft cutting edges. 

 The surfaee of the beak is thrown into numerous sharply defined 

 longitudinal ridges, which more or less inosculate with each. 

 There is no difference between the superior and inferior surfaces 

 in this respect. Length of beak from basal teeth 0,150 m; 

 transverse diameter at base 0,035 m; vertical diameter at the 

 same point 0.020 m; width at middle of the fossae for the 

 premaxillary bone 0,060 m.'' 



Der Hauptunterschied scheint in der Sculptur des Rostrum 

 zu liegen: Bei E. penetrans zahlreiche, dicht gedrängte, scharfe, 

 kurze, ziemlich gerade verlaufende Leisten; bei E. nitida die 

 Leisten weniger gedrängt, weniger hoch, oft gekräuselt verlaufend 

 und zahlreiche kurze Seitenzweige entsendend (vergl. Taf. XIV, 

 Fig. 1 und 5). Vielleicht wäre als ein weiterer Unterschied noch 

 die Erscheinung hinzuzufügen, dass sich auf dem Ethmoidale über 

 der Alveole des (fehlenden) Vomerzahnes eine geschwulstartige 

 Erhöhung bildet (vergl. oben pag. 281). 



Zu der dritten Species (E. ziphioules) bemerkt Cope (1. c, 

 p. 822): „The third species of Erisichthe is represented by a 

 muzzle of an old individual, which has lost a good deal of its 

 apex by attrition. Its surfaee lacks the sculpture of the other 

 species; but whether this smoothness is due to attrition or not is 

 uncertain. The alveolae for the basilar teeth are empty and 

 alraost filled up with bone. The form of the muzzle is quite 

 peculiar. Its shaft is depressed, with a strongly convex inferior 

 surfaee, the two separated by an obtuse angular border. Behind 

 the alveolae, the inferior surfaee is narrowed by a strong lateral 

 contraction. in which the superior surfaee shares in a slight de- 

 gree. The latter is continued in a prominent border. The in- 

 ferior surfaee is divided by an angular depression. the apex of 

 which is directed forward. It is perhaps the articular face for 



