PEOM THE TBIAS OF LOMBAEDY. 7 



nearly as long as the neck and body, thus proportionately quite as long as in Meso- 

 saurus or Macromerosaurus. So far as I am able to make out from the photogi-aph, 

 the tail of N. pusillus comprises at least 40 vertebrae. The notch in the pubis, to 

 which Prof. Seeley alludes, is not distinctly shown on the lithographed figure published 

 in 1882, but is well marked both on the woodcut, p. 364 of the description, and on 

 the specimen No. E. 53 in the British Museum, and agrees in every respect with the 

 figure of the Reptile referred by Deecke (i6) to Lariosaurus. Dames (22) has already 

 pointed out that Deecke's Lariosaurus could hardly be the same as the Lariosaurus of 

 Crivelli and Curioni, from which it differs in the shape of the clavicle, the feebly curved 

 and distally expanded humerus, the longer propodials, and the notched pubis. Apart 

 from the supposed absence of an ectepicondylar foramen in the humerus, which may 

 after all be due to its having been overlooked, I can see no ground for regarding 

 Deecke's specimen as generically distinct from Neusticosaurus pusillus. Of course, so 

 long as the skull remains unknown, no certain conclusion can be arrived at, but I am 

 much struck by the agreement of Deecke's and Fraas's specimens in the following 

 points : — 



1. The cervical vertebrae are less massive than in Lariosaurus. 



2. The dorsal ribs are much thicker in their proximal than in their distal portion ; 



the head is expanded and slightly notched. 



3. The number of dorsal vertebrae, 23 to 25, which is higher than in Lariosaurus. 



4. The distally flattened and strongly expanded humerus. 



5. The slender, proximally expanded radius, which exceeds half the length of the 



humerus. 



6. The shape of the coracoid. 



7. The shape of the pubis. 



With regard to Neusticosaurus pusillus I must observe that there are certainly 21, 

 and perhaps 22 cervical vertebrae; and that therefore the generic identity of this 

 Eeptile with Pachypleura, suggested by Lydekker (21) and accepted by Zittel (20), is 

 out of question, as well as its identification with Lariosaurus proposed by Bassani (i8)^ 



Pachypleura edwardsii, as known from the descriptions and figures of Cornalia (9) 

 and Curioni (12), agrees in many respects with Lariosaurus and Neusticosaurus ; but 

 the neck contains only 16 vertebrae, and the humerus is longer than the femur ; the 

 radius and ulna are slender, and two thirds the length of the humerus ; the exact 

 number of phalanges is still unknown. 



Bactylosaurus, Giirich (15), from the Muschelkalk of Silesia, agrees in the number 

 of cervical vertebrae and the shape and proportion of the radius and ulna with Pachy- 

 pleura ; the phalanges number 2, 3, 8, 4, 3, and the fourth finger is longer than the third. 



" The specimen from Viggiu, figured on plate ii. of Comalia's memoir, muat be taken as the type of Pachy- 

 jyleura edwardsii. The specimen from Besano, figured on plate i., is possibly a Neusticosaurus. 



