1S78.] 511 [Cope. 



from the recent species of the order in the absence of quaclrato-jugal arch, 

 and the remarkably developed ischia. On this account I refer to Clepsy- 

 drops and its allies as a distinct suborder under the name of Pelycosauria. 

 Char. Specif. The muzzle of this species is compressed and descends ob- 

 tusely at the end as in Bolosaurus striatus. The nostril and orbit are quite 

 large. The first premaxillary tooth is the largest and has a silky striation 

 of the enamel ; its crown is much less than that of the canine. The canine 

 originates below a point a short distance posterior to the nostril. 



Measurements. M. 



Length of skull to posterior base of quadrate' 0.124 



Diameter of nostril 019 



Depth of zygoma at orbit .012 - 



Length of crown of canine tooth .016 



Antero-posterior diameter of canine tooth 005 



The centra of the lumbar vertebrae are compressed, but not deeper than 

 long, nor acute on the median line below. The diapophyses are wide, and 

 descend towards the anterior articular border. The neural spines are com- 

 pressed, and are very long. Their apices are slender and curved back- 

 wards. The faces of the zygapophyses are oblique upwards and outwards. 

 The caudal vertebrae have subrouud articular extremities anteriorly, and 

 become more compressed posteriorly. The diapophyses are median on the 

 former, and gradually become smaller to extinction. The zygapophyses 

 are strong, and the neural spines continue long for a considerable part of 

 the length of the entire series. The centrum is concave below the diapo- 

 physes, and has a median inferior rib. 



Measurements. M. 



Length of centrum of fourth from last lumbar vertebrae. .018 

 Vertical diameter of " " " .017 



Transverse diameter of " " " .018 



Elevation of neural arch and spine of last lumbar 087 



Antero-posterior extent of ilium c 059 



" pubis 060 



" " " ischium 143 



Depth of pelvis 080 



Length of femur 120 



Long diameter of proximal end 041 



Length of tibia . 085 



Transverse width of tibia 029 



Length of eleven caudal vertebrae 172 



" " fourth caudal " 016 



" " eleventh caudal " 014 



Transverse diameter of caudal 012 



This species differs from the G. vinslovii in the more robust caudal ver- 

 tebrae. It is also considei-ably larger, agreeing in this respect with the G. 

 pedunculatus. In the latter the long transverse processes are decurved 



