12 FOSSIL REPTILIA OF THE PORTLAND STONE. 
The breadth of the cnemion, including the fabella, is 6 inches 9 lines. 
The length of the paddle, from the head of the femur to the tarsus inclusive, is 1 foot 
5 inches 6 lines. 
If these dimensions are of the fin of a full-grown Pliosaur, the Portland species is 
inferior in size to the grand Pliosaurs of the Kimmeridge Clay. Vertebrae* and teeth of 
Pliosaurus portlandicus are still desiderata, and well worth careful looking after by collectors 
of fossils from that interesting formation. 
* Since this was penned fragments of the skeleton of the same individual have been transmitted to the 
British Museum, including an entire caudal vertebra, with the characters described at p. 2; also portions 
of ribs, which have a subcircular transverse section and compact structure, as in Sauropterygia generally. 
Should materials reach me, I hope to be able to show modifications of cervical and other vertebrae of 
specific value, and to refer them to their respective kinds of Pliosaur. 
