49 



ICHTHYOSAURUS TRIG ONUS. 



Owen, Rep. Brit. Assoc, for 1839, p. 124 (1840). 

 a. A series of vertebral centra belonging to this or allied species ; 

 from the Kimeridge Clay of England. 



i. The centrum of a very large caudal vertebra; from the Kimer- 

 idge Clay of Shotover, near Oxford. Presented by D. T. Thisdton 

 Dyer, Esq. 



ICHTHYOSAURUS COMMUNIS. 



Conybeare, Trans. Geol. Soc, ser 2, vol. I, p. 108 (1822). 



a. Slab showing left lateral aspect of greater part of skeleton; 

 from the Lower Lias of Barrow-on-Soar, Leicestershire. Although 

 the pelvic paddles are wanting, the pectoral ones apparently 

 indicate that the specimen belongs to the present, as distinct from 

 the next species. 



b. Slab showing dorsal aspect of the skeleton of a smaller indi- 

 vidual ; from the Lower Lias of Lj'me-Regis, Dorsetshire* 



c. Slab showing the headless skeleton of a very young individual ; 

 from Lyme-Regis. 



d. Slab with the imperfect skeleton of a nearly similar individual ; 

 from Lyme-Regis. 



e. Slab showing the imperfect skeleton of a young individual 

 probably belongmg to this species ; from Barrow. 



f. Slab showing the pectoral paddle of a very large individual ; 

 from Lyme-Regis. 



g. Slab with a smaller imperfect pectoral paddle probably refer- 

 able to this species ; from Lyme-Regis. 



h. Slab with small imperfect pectoral paddle ; from Lyme-Regis. 

 /. Several large teeth ; from Lyme-Regis. 



Of the following specimens some probably belong to the present 

 and others to the next species. 



k. The imperfect skull of a medium-sized individual; from 

 Barrow. The large size of the teeth indicates /. communis. "" 



