50 CALIFOKNIA ACADEMY OF SCIENCES 



EXPLANATION OF PLATE VII. 



All f(iures three ftnirtha natural size. 



Fig. 1. Thahittosaiirns alexandrae. Anterior dorsal vertebra, side view. 



Fig. 2. T. alexandrae. Dorsal vertebra, anterior side. 



Fig. 3. T. alexandrae. Anterior caudal vertebra, side view and sagittal section. Tbe neural 



spine appears to be somewhat too erect in the figure. Type specimen. 



Fig. 4. T. shaMensis. Neural arch of a cervical or anterior dorsal vertebra. Type specimen. 



Fig. 5. Neetosaurii.'! halivs. Weathered cross-section of vertelira. Type specimen. 



Fig. 6. Thalattosaunis ])errini. Anterior dorsal rili. Type specimen. 



Fig. 7. T. shastensis. Head of dorsal rib. Type specimen. 



Fig. 8. T. alexandrae. Pubis (?) 



Fig. 9. T. alexandrae. Ischium (?) Type specimen. 



Fig. 10. T. alexandrae. Pubis (?) 



