1877.] 



181 



[Cope. 



three convex lobes of dense tissue. The lateral of these are divergent 

 and dorsal ; the median is narrower, and is radial to the circumference. 

 This structure does not appear in the alveolar fossae of the three external 

 rows. It is probably a hinge like attachment permitting elevation and 

 depression of the teeth of the inner rows. 



The supposed maxillary bone presents a wide open groove on both sides 

 The superior border is convex in section and not so wide as the tooth 

 bearing face, which is slightly oblique. But for this obliquity the section 

 would be that of a T-rail. The groove of the internal face is contin- 

 ued further forward than that of the external face. There are six 

 rows of teeth arranged as in the dentary bone, but in reversed order. 



The fragment of palatine bone is densely packed with teeth, which are 

 longer than those of the jaws. Their apices are as in the latter, simple. 

 Those of one border are longer than those of the other, and the alveolar 

 fossae of these (the only ones I can see) bear the three adjacent tuberosi 

 ties above described. 



The vertebrae considerably resemble those of Empo. Their centra in 

 both abdominal and caudal regions are elongate and contracted medially. 

 There is a shallow longitudinal groove at the bases of the neural and 

 haemal arches, which are divided vertically by a median rib-like buttress - 

 The median lateral portion is smooth or nearly so. 



Measurements M. 



Length of dentary bone preserved 0550 * 



Depth " " " atmiddle •. 0080 



•' " dentary tooth band at middle 0050 



" ; ' " at symphysis 0045 



Length of maxillary bone preserved ... .0530 



tooth 0045 



Depth " " atmiddle 0060 



Width '■ '• " " 0050 



" palatine bone 0100 



r longitudinal 0160 



Diameter of an abdominal vertebra •< transverse 0115 



(_ vertical 0125 



This species differs from the 8. apiealis in the simple form of the apices 

 of the teeth. The type specimen is much smaller than that of S. apiealis. 



