SUPPLEMENT. 275 



one later dorsal (d). The anterior dorsals are of the 

 eloDgated type of No. 41238 a x (supra, ii. p. 228), while 

 the later cervicals are short like 45904 (I. c). The an- 

 terior dorsals have elliptical terminal faces, while the faces 

 of the later dorsal are subcylindrical. 



R. 1676. Slab showing the dorsal aspect of the left coracoid, imper- 

 fect anteriorly. This specimen agrees in size with the 

 scapula and coracoid, No. 41217 (supra, i. p. 230) ; it is, 

 however, much less imperfect than the latter. 



R. 1677. A bone which is probably an ischium of an immature in- 

 dividual. 



R. 1606. The slightly imperfect centrum of an anterior or middle 

 cervical vertebra; from the Portland Oolite of tbe Isle of 

 Portland. No history, 



R. 1607. The slightly imperfect centra of two posterior cervical 

 (Fig.) vertebrae ; from the ' ash-bed ' of the Purbeck of the 

 Isle of Portland. Described, and one of the specimens 

 figured by the donor in the ' Quart. Journ. Geol. Soc.' 

 vol. xlvi. p. 48, fig. 5. The dimensions are— length 0,048 

 (1-9 inch), height 0,048 (1-9 inch), width 0,061 (2-4 

 inches). These are somewhat larger than those of the type 

 cervical of Plesiosaurus carinatus figured by Phillips, and 

 considerably larger than those of Nos. 41238 and 45904 

 (supra, ii. p. 227). It was considered in Part II. that No. 

 41238 would agree in relative size with the type pelvic 

 limb ; but a subsequent comparison with the skeleton of 

 C. richardsoni has shown that the present specimen pre- 

 sents nearer proportionate dimensions. The present spe- 

 cimen differs from Nos. 41238 and 45904 by the more 

 prominent haemal carina and the deeper depressions on 

 either side ; this being probably due to the waterworn 

 condition and immaturity of the two former specimens. 

 In this respect the present specimens agree with the one 

 figured by Phillips. The undetermined propodial, No. 

 21974, mentioned in Part II. p. 227, may belong to this 

 form, although indicating a small individual. 



Presented by E. Lydekher, Esq., 1889. 



1 In Part II. pp. 228, 229, the number 41238 occurs three times; the second 

 and third repetitions should respectively have the suffix a and b. 



