54 



ICHTHTOPTEEYGIA. 



latimanus is based on a description of the present speci- 

 men mixed up with that of the specimen of /. communis, 

 No. 1064 (p. 43). The present specimen having no 

 pectoral limb cannot have afforded the diagnosis based on 

 that part of the skeleton, while most of the dimen- 

 sions given by Owen, as well as the number of the teeth, 

 do not agree with those of this specimen. The descrip- 

 tion of impressions of the skin seems, however, to refer 

 to this specimen ; and the total length and general preser- 

 vation of the vertebral column also tally with Owen's 



Fig. 22. 



Ichthyosaurus conybeari. — The ventral aspect of the left pectoral limb of 

 No. 38523. f . h, humerus ; r, radius ; u, ulna ; i, intermedium. The 

 vertical lines show the relative lengths of the limb and the skull; the 

 longer one being that of the skull drawn of the same absolute size as 

 in fig. 20. The notches in the anterior border of the first row of 

 phalangeals are omitted. 



description. On the other hand, the condition of the 

 vertebral column, and the dimensions of the pectoral limb 

 of the above-mentioned skeleton of /. communis indicate the 

 impossibility of that specimen alone having been the type of 

 1. latimanus. On these grounds the latter name must be 

 abolished. Presented by the Council of the Bristol 



Philosophical Institute, 1839. 



