272 SATTROPTEKYGIA. 



on the centrum ; neural spines with anterior border curving back- 

 wards to form a pointed summit, and the height from above the 

 postzygapophysis less than that of the latter above the centrum. 

 Posterior cervicals and anterior dorsals with very short centra, in 

 which the terminal faces are extremely elliptical. Humerus and 

 femur nearly equal in length. Radius and ulna comparatively long 

 and narrow ; 6 carpal and tarsal bones. 



The number of cervical vertebrae is given by Owen as 24, but 

 since there are 33 in the closely allied P. longirostris, this is prima 

 facie improbable. That some are missing in the type is shown by 

 plate xi. fig. 2 of Owen's memoir, where there must obviously have 

 been a gap between the narrow centra described as the 16th and 17th, 

 and the broad one regarded as the 18th, which is evidently much 

 later in the series. The existence of a larger number of vertebras is 

 also shown by No. E. 1337. In the figures of the 1 5th vertebra 

 given by Owen on pi. x. it appears that the contour of the terminal 

 faces has been drawn from one of the later cervical or early dorsal 

 vertebrae. 



Hob. Europe (England). 



38525. Slab showing the dorsal and part of the right lateral aspect 

 (Fig.) of the nearly entire skeleton ; from the Lower Lias of 

 Charmouth, Dorsetshire. Described and figured by Owen 

 in his ' Liassic lleptilia,' Sauropterygia, p. 20, pis. ix.-xii. 

 The cranium is much crushed, and is dislocated from the 

 neck ; the mandible, which is laterally flattened, and can 

 be removed from the matrix, exhibits the teeth in very 

 perfect preservation. There are several dislocations in the 

 cervical region, and, as already mentioned, some vertebrae 

 are missing after the 17th ; reference has also been made 

 to the incorrect contour of the terminal faces of the middle 

 cervicals in Owen's memoir. The terminal face of an 

 early dorsal is exposed. The whole of the limbs are com- 

 plete, but only the borders of the pectoral and pelvic 

 girdles are visible. Purchased, 1863. 



E. 37. The broken muzzle of a skull much obscured by matrix, 

 probably referable to the present species ; from the Lower 

 Lias of Lyme-Eegis, Dorsetshire. Many of the teeth are 

 well shown. Purchased, 1880. 



R. 1337. Slab showing the left lateral aspect of an imperfect 

 skeleton ; from the Lower Lias, probably of Lymo-Regis. 

 This specimen, which has evidently been much waterworn, 

 exhibits a part of the skull in a greatly damaged condition, 



