622 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [June 22, 
by Gegenbaur,—and conclude with the remark that this additional 
cnemial element, extending, as it does, the basis of support of the 
tarsus and digits, suggests the presence of additional postaxial 
digits above five, the number in the Liassic Plesioswuri. Should 
this prove so, it will add another and a striking resemblance to those 
already known between this subgenus of Plestosawrus and the Plio- 
sauri and Ichthyosauri. I propose to distinguish this new Kimmeridge 
Plesvosaurus by the specific name of Manselu (Plesiosaurus Manselit). 
Dimensions of Centra of Vertebre. 
Distance between 
Antero- | Transverse Ventinal wee ol DOLE a 
posterior | horizontal di en pera OO 
ismctee dines iameter. | cess and level of 
: upper surface of 
centrum. 
Cervical. inches. inches. inches. inch. 
INOS ee eee. 3 1:2 1-2 8 
PAR 8 1:3 1:0 7 
(cyanea adage 1°8 1:7 1:7 13 
ALD be eee ah 2:2 21 2-5 1:8 
Dihd esemene 2:5 40 3-2 1:9 
Transitional ... 2-4 4-4 34 
Dorsal ......... 2-2 42 3:6 
Caudal 
INOS so pent 2:2 4:3 34 
Giseeedeees 1:9 36 30 
1 Deets ate 16 2-7 2:2 
16. 1:0 1-4 1:5 
EXPLANATION OF PLATE XLI. 
Figs. 1 to 6 illustrate the osteology of Plesiosawrus Manselit. 
Fig. 1. Ventral view of left humerus: a, proximal end; 4, distal end; c, pre- 
axial border; d, postaxial border. 
Fig. 2. Proximal end of this humerus: 4, articular caput; 6, trochanter. 
Fig. 3. Ventral view of left femur: a, proximal end; 0, distal end; c¢, pre- 
axial border; d, postaxial border ; e, trochanter; f, preaxial bone of 
leg ; g, first postaxial bone ; 2, second postaxial bone. 
Fig.4. View of proximal end of this femur: a, articular head; 0, trochanter. 
Fig. 5. Dorsal view of conjoined coracoids: a, front border; 6, posterior 
border ; ¢, ¢, glenoid fosse ; d, scapular facet. 
Fig. 6. View of outer end of coracoid: a, glenoid cavity ; 4, scapular facet. 
Figs. 7, 8,9. Vertebree of Plesiosaurus brachistospondylus. 
Fig. 7. Front view. 
Fig. 8. Back view. 
Fig. 9. Oblique view, showing the antero-posterior diameter or length of the 
centrum. 
