34 REVISION OF THE PELYCOSAURIA. 



of the centrum is excavated by a deep longitudinal pit, which is strong on the anterior 

 of three vertebra, but is absent on the third. The centrum is about as high as long. 

 The transverse processes rise from high up on the side of the neural arch and are 

 directed obliquely downwards ; their length is from 45 to 50 mm. These are the 

 vertebrse in block 1 1 1 of v. Huene's figure. Among the isolated vertebne two show 

 longitudinal ridges on the side of the centrum fv. H. (103) plate v, figs. 7-8) and 

 above the ridges the sides of the centrum are concave. The neurocentral suture is still 

 traceable. Another free vertebra (v. H., plate v, fig. 9) has a slight thickening of the 

 edge of the posterior face of the centrum. Still another (fig. 10) with a complete 

 neural spine has an even stronger thickening of this edge. The spine is strong but 

 thin transversely. The posterior zygapophyses are widely divergent and between 

 them there is a strong hyposphene. A sacral vertebra has ver>' short and strong 

 transverse process with a rough articular face for the attachment of the ribs. Four 

 vertebrse (v. H., plate v, figs. 13-16) regarded by v. Huene as sacrals seem to be 

 anterior caudals. The ends of the ribs are broadly rounded into stumpy processes, 

 and the lower face is marked on either side of the median line by two deep pits, as in 

 the Pelycosauria. 



Measurements. 



mm. mm. 



Length of each of the three lumbars 35 Height of same from bottom of centrum to top 



Length of vertebrse with ridges on side of cen- of spine no 



trum 32 Height of spine of another above prezygapophy- 



Diameter of anterior face of same : ses 60 



Vertical 33 Length of the bottom line of a sacral 20 



Horizontal 30 Diameter of anterior face of centrum of same : 



Length of vertebra with complete neural spine-- 28 Vertical 30 



Diameter of posterior face of same ; Horizontal 30 



Vertical 25 Length of each of three caudals 25 



Horizontal 32 



It is pretty certain that Anomosaurns is no tnie Pelycosatir, because 

 the vertebras are not notocbordal (with the exception of one specimen 

 mentioned by v. Huene) and because the Pelycosaiiria do not have a hypo- 

 sphene. Occurring in the whole thickness of the Muschelkalk it is much 

 later than the Poliosain-idc^^ the only family with which it can be connected. 

 Many characters, as the elongate pit on the side of the centrum, and the 

 thickening of the posterior edge of the centrum marking the position of the 

 insertion of the head of the rib, and the nearly equal length of the vertebrae 

 throughout the column, indicate resemblances to the genus Naosaiirus^ but 

 there can be no true relationship. It is most probable that it is a persist- 

 ent form derived from the early Pelycosaurian stem and having much the 

 same history as Ctenosaurus kosneni. 



Stereorachis domlnans Gaudry. 



Compt. Rendu Ac. Sc. Paris, t. 91, 1880, p. 669. 

 Ann. and Mag. Nat. Hist. (5), vol. vii, 1881, p. 69. 



Type : An incomplete skeleton showing fragments of the skull, vertebral 

 column, shoulder girdle, and humerus; from near Igornay, France. Preserved in 

 the Museum of the Jardin des Plantes, Paris. 



