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 fosse 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 
fosse of these (the only ones I can see) bear the three adjacent tuberosi- 
ties above described. 
The vertebre considerably resemble those of Hmpo. 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 
hemal 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....... Ap doOoeC Sd F080 0550 
Depth “ - seo AG EI Mek Severs aysieysrcicverale cisions .0080 
aif «« dentary tooth band at middle.............. 0050 
ep of ze AL CARN OOo eee oon Odes DUS bOOo 0045 
Length of maxillary bone preserved.............. -.. .0530 
se Hy $ POOGH 02 50 seysialoreven const one otiecaeteeiareis 0045 
Depth <“ WG ri Aan tN GG Ko IKE i Heeooae ea TS are Oe .0060 
Width * gs Saiak Sis of. aic tote steel acs typ ae seats 0050 
ue 30 OMENS LG aon eodno0 coupKGoOL acSile Danis ane .0100 
longitudinal.......... .0160 
Diameter of an abdominal vertebra < transverse..... CUBS OOK -O115 
VCH ULG Di elerete ererstelele eisrete! 0125 
This species differs from the S. apicalis in the simple form of the apices 
of the teeth. The type specimen is much smaller than that of S. apicalis. 
