46 CALIFORNIA Af'Al^EMA' OF SCIENCES 



EXPLANATION OF PLATE V. 



Fig. 1(7. ThahtUmtauruit nlexandrne. Pterygoid, lateral view. Type specimen. Natural size. 



Fig. 1/*. Upper side of specimen shown in fig. la. Natural size. 



Fig. Ic. Lower side of specimen shown in tig. hi. Natural size. 



Fig. 2(7. Thalattosaitrus alexandrae. Lower side of prevomer. X -|. 



Fig. 2b. Lateral view of specimen shown in fig. 2n. x |. 



Fig. 3. Thalattosaurus perrini. Lateral view of prevomer. Median pair of teeth partly 



restored. Type specimen, x |. 



Fig. 4. Nectosaurus halius ('?) Pterygoid or jialatine, superior view. X H. 



Fig. 5. Thalattosaurus, sp. Vomerine tooth. X H. 



Fig. 6. Nectosniirvs haJivs (?) Maxillary. Natural size. 



