SYSTEMATIC REVISION OF THE SUBORDER. 41 



the foramen is considerably above the middle point. The diapophysis and para- 

 pophysis are not distinct nor elongate, but are represented by a projecting ridge in 

 the superior part of the centrum, which is directed downwards and forwards toward 

 the rim of the articular face. 



"Besides the great contraction of the centrum, its relatively shorter form distin- 

 guishes it from that of C. coUetii. It is also much larger than that species and the 

 C. peduncida/iis, being the largest of the genus." 



jn7n. mm. 



Length of centrum 31 Transverse diameter of centrum 33 



Vertical diameter of centrum 39 Width of neural canal 6 



The single vertebra that can be identified as Cope's type is an anterior 

 dorsal of D. incishnis. 



Clepsydrops pedunculatus Cope. 



Cope, Proc. Am. Phil. Soc, vol. xvii, 1877, p. 62. 

 Case, Jnl. Geol., vol. viii, 1900, p. 713. 



Type : A third cervical and an anterior caudal regarded by Cope as a dorsal. 

 No. 6534 University of Chicago, Gurley, coll.; from Vermilion county, Illinois (plate 

 7, figs. 14 and 15). 



Original description: " Both differ from corresponding vertebrce of C. colletii anA 

 C. lateralis [this is evidently a slip on the part of the describer ; there is no C. late- 

 ralis; C. vinslovii is evidently referred to, as it was the only other species of the genus 

 described at this date] in having elongate diapophyses for the attachnient of the ribs. 

 These are present in the other species, but are either very short, or sessile. The third 

 cervical has a broad reverted anterior lip-like margin of the anterior articular face, 

 which resembles the corresponding part in C. lateralis (vinsloz'ii) in not being pro- 

 duced below. The median line is keeled, and there is a shallow longitudinal groove 

 on the upper part of the sides. The posterior articular face is regularly funnel- 

 shaped. The diapophyses are very stout, and are directed a little downwards and 

 strongly backwards. The articular faces are single, look downwards and outwards, 

 and are wide above, and narrow below. The base of the neural canal is deeply 

 incised, as in the other species. 



Measurements. 



{Antero-posterior 0.015 Length of diapophysis above 0.009 



Transverse 0125 „. . c j- i, • (Vertical 008 



,, . , -■ Diameter of diapophysis -^^ , . , . 



Vertical 012 f f ^ (Antero-postenor... .005 



"There is no recurved rim of the articular extremities, but the surface does not 

 pass regularly into the foramen chordte dorsalis, but by an abrupt descent at its 

 mouth. The sides of the centrum are concave, and the inferior portion forms a prom- 

 inent rounded rib." 



Measurements. 



?n. 



{Antero-posterior 0.016 

 Vertical 016 

 Transverse 015 



In the description of the supposed dorsal attention is called to the long 

 and slender diapophysis ; it is evident that this is not a diapophysis, but 



