Cope.] -^lo [March 18, 



proximal process, and is oblique proximally, but is more nearly vertical 

 distally. In its posterior angle rests the club-shaped head of the robust 

 columella auris. 



The vomer presents as its anterior extremity a process which separates 

 a transverse process from each maxillary, and enters a notch in the poste- 

 rior border of the preraaxillary. The vomers are plane in front but become 

 convex and separated by a fissure posteriorly, ending each in an acumi- 

 nate apex lying on the presphenoid. The palatine is narrow and lies along 

 the inner side of the ectopterygoid, consisting chiefly of its maxillary 

 process ; it is doubtful whether it possesses a vomerine process. Posteri- 

 orly it lies scale-like on the pterygoid, reaching nearly to the line of the 

 quadrate (PI. i, Fig. 5, b pi.). The nareal fissure is nearly closed ante- 

 riorly, except a foramen-like portion at the anterior extremity. The pre- 

 sphenoid, sphenoid and basioccipital are coossified. To these the ptery- 

 goid is closely appressed by the one side, while on the outer side the latter 

 carries the narrow splint-like ectopterygoid as far as the maxillary. No 

 palatine foramen. Occipital condyle simple, transverse, medially con- 

 cave. 



The mandible displays no Meckelian groove, and the splenial is small. 

 The small angular is only visible on the internal side of the ramus. Sur- 

 angular and articular confluent. Coronoid large, triangular, not concave 

 below, and overlaid at base externally by anterior extremity of surangu- 

 lar ; anteriorly not extended over dentary. Angle short, longer than 

 wide, a little inflected, simple ; its plane an angle of 45° to that of the 

 ramus. 



The hyoid apparatus is very simple. It consists of a glossobasihyal car- 

 tilage which is deeply bifurcate posteriorly. At the posterior extremity 

 each posterior limb sends a process forwards, which is about half as long 

 as tlie anterior elements, the hypohyal. No ceratohyal nor second cerato- 

 branchial. A rather short and simple osseous first ceratobranchial on 

 each side. 



The vertebral column consists of many cervico-dorsals and a relatively 

 small number of caudals. The second vertebra has a strong keel-like 

 hypapophysis, which is also strong on the third, but which diminishes 

 from that point so that on the sixth it is no longer perceptible. Tlie first 

 rib is short and is attached to the third vertebra. Diapophyses and neu- 

 ral spines very short. The ribs do not display a vertical process at the 

 head as in Lepidosternum oetosteg urn. Diapophyses very short and simple 

 on caudal vertebrtB. Caudal hypai»opliyses commencing on the antei"ior 

 fourth of the caudal series, at first the halves widely separated. They 

 soon converge downwards, and finally touch, but are never coossified to 

 form a chevron. Position on the middle of the length of the centrum. 

 Rib-bearing vertebrfe without trace of zygosphen. 



Scapular arch absent. Pelvic arch represented by a single curved rod 

 on each side of and anterior to the vent, which is connected with the 

 extremities of two ribs hy ligament only. This is the ileopecliiieal bone 

 of Fiirbringer. No trace of posterior limb. 



