ICHTHY0SATJRIDJ3. 71 



a. Amtirostrine Subgroup. 



Teeth comparatively small, with cylindrical and fluted crowns 

 and roots. Mandible with superior border of articular bone con- 

 siderably above the level of the alveolar border of the dentary. 

 Centra of cervical vertebrae subcordiform and pentangular, and 

 those of posterior dorsals and anterior caudals narrowed superiorly ; 

 upper costal tubercles of cervicals partly supported on the arch. 

 Coracoid without posterior notch. Humerus with the proximal 

 extremity obloug, and the longer axis of the same directed antero- 

 posteriorly. Pectoral limb larger than pelvic. 



In the characters of the vertebrae and coracoid, this subgroup 

 appears allied to the Campjdodont subgroup : and in some forms the 

 scapula is of the type of the latter. 



Ichthyosaurus integer, Bronn 1 . 



The notch in the radius wanting, and that in the radiale either 

 very slight or absent ; transverse diameter of the radius consider- 

 ably longer than the vertical ; component bones not large ; and 

 first row of ulnar phalangeals oblong. Anterior notch of coracoid 

 very small, or absent. 



This species, of which the type specimen was obtained from the 

 Upper Lias of AYurtemberg, was referred by Wagner, and subse- 

 quently by Kiprijanoff, to the Latipinnate group ; but the structure 

 of the pectoral paddle clearly shows that it belongs to the present 

 group, which it connects with the former. The type specimens 

 indicate a comparatively small form, which was probably closely 

 allied to the next species. 



Hub. Europe (Wiirtemberg and [?] England). 



47409. A considerable portion of the skeleton of a small Ichthyo- 

 saur belonging either to this or a closely allied form ; 

 from the Upper Lias of Kingsthorpe, Yorkshire. The 

 portions remaining comprise fragments of the skull, a large 

 number of vertebral centra, one coracoid, portions of the 

 pectoral limbs, and a femur. Of the right pectoral limb 

 there remains the entire humerus, with the radius, ulna, 

 radiale, intermedium, ulnare, and the two middle bones of 

 the next row in apposition, together with a por-tion of the 

 phalangeals. This specimen accords so closely with the 

 right pectoral limb figured by Wagner in ' Abh. k.-bay. Ak. 

 Wiss.' vol. vi. pt. 2, pi. xvi. fig. 1, as to leave little doubt 

 as to the specific identity of the two. In both the radius 

 1 Neues Jain b. 1844, p. 67 ( J. 



