Cope.] ^^^ [March 18, 



groove along their common suture. The nareal fissure is long and narrow, 

 and is contracted anteriorly, and then enlarged foramen-like at the anterior 

 extremity. The vomerine branch of the palatines is longer than the 

 maxillary branch ; the pterygoid branch is not very wide, and the pala- 

 tine foramen is of moderate size. The ectopterygoid is rather wide and 

 has an anterior suture with the palatine bone as well as with the maxil- 

 lary ; it is deflected posteriorly. Pterygoid moderately expanded ante- 

 riorly and contracting gradually ; the posterior portion but slightly 

 grooved, and attached to the basipterygoid process by its entire width, 

 and not by the groove only. Presphenoid rudimental ; sphenoid distin- 

 guished from basioccipital by suture; the latter with descending com- 

 pressed lateral processes. Petrosal with a short presemicircular process, 

 and a long subforaminal process ; the latter presenting an open groove 

 downwards. Inferior face of frontal grooved ; postoplic not reaching 

 frontal, triradiate, the two superior limbs shorter than the inferior. 

 Epipterygoid arising opposite ectopterygoid and in contact with a de- 

 scending lateral process of the parietal and not touching petrosal. 



The hyoid apparatus is distinguished, like that of other Tiidcie, by the 

 great prolongation of the hypohyals anterior to the point of attachment 

 of the ceratohyals. No second ceratobranchials or free epibranchials. 



In the mandible the Meckelian groove is closed except at the distal por- 

 tion. The coronoid is produced far anteriorly and not at all posteriorly 

 on the external face, and the dentary does not extend much beyond the 

 tooth line. Surangular distinct; angle horizontal, expanded, and forming 

 an angle inwards. A distinct masseteric fossa, bounded below by the 

 angular. Splenial elongate, extending far anterior to the splenial foramen. 



Teeth with the crowns moderately compressed and unequally bicuspid ; 

 those of premaxillary and adjacent part of maxillary bone and correspond- 

 ing part of mandible, simple. 



Dorsal vertebrae with zygosphen. In both C. iessellaius and C. sexUnea- 

 tus there are five cervical intercentra besides that of the atlas, and 

 the first rib is on the third or fourth vertebra. Two sacral diapophj^- 

 ses, both robust. Neural spines distinct, moderate, highest in the caudal 

 series ; ribs extending to sacrum. Diapophyses very short except in cau- 

 dal region, where they extend for a considerable part of the length, origi- 

 nating posterior to the middle of the centrum. On the distal part of the 

 caudal series there is an additional short spine-like diapophj^sis in front of 

 the normal one, and the centrum is segmented between the two. The 

 segmentation disappears anteriorly with the disappearance of this pre- 

 diapopliysis. Chevrons intercentral. 



The suprascapula is of moderate dimensions and extends to the summit 

 of the neural spine. Scapula elongate, and with a large proscapula. 

 Coracoid with two deep notches. Interclavicle with a very long median 

 limb, which is wide at the base and which covers an elongate oval median 

 lontanelle. Three sternal ribs, and two attached to the xiphoid rod. 



Ilium with a prominent angulus crista. Acetabulum entire ; pubis di- 



