44 CALIFOKNIA ACADEMY OF SCIENCES 



EXPLANATION OF PLATK IV. 



Fig. 1. Anterior jaw tooth associated with type specimen of T. nlcm)idr<ic. X 14. 



Fig. 2«. ThalaUnnanrus shastensis. Inner side of right half of cranium and mandilile. Type 

 specimen. X |. 



Fig. 2h. Tootli associated witli skull of T. sliastcnds shown in fig. 2a. X 2. 



Fig. 2c. Tooth associated with skull of T. ffhastfinsis shown in fig. 2a. X 2. 



Fig. 3. Thalattosaurua perrini. Inner side of right half of cranium and mandihle. Type 

 specimen. x |. 



Fig. 4a. Nectosaunis haliiis. Superior aspect of fragment of cranium. Type specimen. X f. 



Fig. 4Ji. N. haliv.<i. Inner side of right ramus of inandil)le. Type specimen. X ^ 



Fig. 4c. N. haliii.s. Outer side of middle portion of k'ft ramus of mandilile. Tyiie specimen. X |. 



Fig. 5. N. halivs. (Xiter side of right ramus of mandihle. X |. The anterior end of the supra- 

 angular has l.)een weathered through. 



Legend. 



/), dentary Sc, sclerotic plate 



C, coronoid /, jugal 



An, angular Pr, parietal 



Sa, supra-angvriar Sq, squamosal 



Ar, articular Q, quadrate 



Sp, splenial jl/, maxillary 



/•', frontal PI, jialatine 



I'f. prefrontal ", iirefrontal (?) 



/'/(). post-fronto-orhital /', frontal (?) 



