172 



THE EXTINCT BATRACHIA, REPTILIA 



site extremity it bears a projecting obtusely truncate hypapophysis, whose outline is separated by an entrant angle, 

 from a similar process directed forwards and somewhat downwards. A strong lateral longitudinal ridge marks the 

 place of the surspectant or anterior zygapophysis; but If this interpretation be correct, then there is not on the 

 opposite, in that ease posterior extremity of the last (No. 1), a despectant zygapophysis. The explanation of 

 these apophyses of No. 1 must be left for the present. Below the lateral ridge, one-third the length behind the 

 cotylus of No. 2, appears to he a foramen, resembling that described by Prof. Owen in Pterodactyles.* A second 

 vertebra (No. 5), and a third (No. 10a), closely resemble No. 2. 



Length of centrum No. 2, 



" neural arch, 



Total depth at hypapophysis, 

 Depth at middle of vertebra, 

 " of centrum near condyle, 



.Linen. 

 5.8 

 4.5 

 4. 

 2. 

 1.5 



Dorsal line slightly concave. 



Two vertebrae (No. 10 and 17) exhibit characters intermediate between this type and thai lirst described, as No. 8. 

 They have more depressed neural arch than the latter, and less inferior concavity than No. 2. The condyle is pro- 

 longed beyond the neural arch, and much depressed. They may be dorsals which immediately follow the cervicals. 



A. fourth depressed vertebra resembles in miniature those lirst described as cervicals. Its proportions are rather 

 those of a phalange, as described for both caudals and cervicals of some Pterodactyles, and are obviously procoelian; 

 the inferior face eoneave, and the condyle-lieai iug centrum prolonged beyond the neural arch and slightly decurved. 



Total length (No. 47), 



Length neural arch, 

 Depth anteriorly, 

 " at middle, 



Lines. 

 5. 

 3.5 

 1.5 



.75 



No hypapophysis. 



Views of eleven vertebrae from above are more or less complete, while many others are broken or not charao 

 teristie. Where the neural arch has not been destroyed a bifurcation appears at the extremity opposite the condyloid, 

 which is probably the two extremities of the surspectant, or anterior zygapophyses, which are separated by a deep 

 notch. As they offer no trace of cent nun above them, they are not probably Hie lateral inferior processes described 

 by Owen. The great length of the diapophyses is especially Characteristic of a, Pterosaurian. These are either narrow, 

 of nearly equal breadth (Nos. 2:), 25, 20, 27); shorter and more dilated at the extremity (Nos. 81, 41) or still shorter, 

 and with obliquely truncate extremities (20, 41). The la,st are similar to those figured by Von Meyer as the lumbars of 

 Pt. longipelvis, and nearthem occur two bones, which can most probably be pubes. From a portion of matrix exhibiting 

 the extremity of a, slender diapophysis, with two ribs issuing below it;, it might bo supposed thai they were rib- 

 bearing, while one of the shorter and more spatuliform (dearly bears the end of a rib. 



Total expanse of No. 27, 

 Length centrum, 

 Width diapophysis at end, 

 Expanse No. 25, 

 Width diapophysis base, 



" extremity, 



Expanse No. 20, 

 Diameter neural canal, 



Lines. 



L4.S5 

 8.5 

 1.1 



14.5 

 1.75 

 1.5 

 0.0 

 1. 



;; Philosophical Transaction*, 1*50. 



