1J;92.] 209 [Cope. 



closing a very narrow down-looking groove. Basioccipital and exoccipitals 

 coossified ; condyle small, simple. 



Meckel's canal closed except distally, where it is open on iheundei' side 

 of the ramus. Coronoid developed anteriorly on external face of ramus, 

 the dentary not reaching behind its anterior border. Splenial elongate, 

 partly external ; angular mostly external ; surangular confluent with 

 articular. Angle horizontal incurved with rounded border and concave 

 superior surface. 



Hyoid apparatus displays no second and rather short first ceratobran- 

 cliials. Hypohyal rather long, the ceratohyal extending a little beyond 

 its extremity, and widened at the posterior third. A free epibranchial 

 which has a bifurcate anterior extremity at that of the ceratohyal, and 

 extends posteriorly but little behind the ceratobranchial. 



Five cervical intercentra, and two cervicals besides atlas without ribs. 

 The odontoid is coossified with the axis. Ribs extend to sacrum. Sacral 

 diapophyses distinct from each other. Dorsal vertebroe without zygosphen, 

 prezygapophyseal facets not continued on neural arch. Caudal diapo- 

 physes present ; centra of middle region segmented through them ; 

 chevron bones interceutral. Neural spines low, higher on caudal region. 



Suprascapula much larger than scapula ; no proscapula. One large 

 coracoid notch. Sternum without fontanelle, with three ribs and two 

 attached to xiphoid rod. 



Ilium without prominent angulus crutce ; acetabulum entire; pubes 

 uniting at an acute angle ; pectineal angle medium. Ischia with promi- 

 nent tuber. 



Cnemidophorus Wiegmann. 



For characters of the skeleton I have three individuals of the C. tessel- 

 latus from my own, and one of the G. sexlineatus from the National 

 collection. The alveolar portion of the preinaxillary is prominent, 

 and is marked ofi from that of the maxillary bone by a shallow 

 emargination on each side. The superior spine is long, and the palatal 

 border is deeply emarginate to receive the narrow anterior production 

 of the vomers. The nasals are distinct and rather elongate, although 

 encroached on in front by the enlarged nostrils. The frontal is 

 single and is rather narrow. The parietal is without pineal foramen 

 in the adult. The parietoquadrate arch is well elevated, and is braced 

 below by the small paroccipital. The supraoccipital is in close con- 

 tact with the parietal by its middle portion, and it is distinct from the 

 exoccipital by suture. The prefrontal does not extend above the orbit ; 

 the lachrymal is smaller, but rather large, and forms a suture with the 

 jugal. The postfrontal is wanting, being fused with the postorbital. 

 The latter is produced downwards and has a longer suture with the 

 supratemporal than with the narrow jugal. The quadrate has an external 

 conch only. The vomers are elongate and are in contact throughout, but 

 each is swollen on the middle line so that they are divided by a 



