UNIVERSITY OF CALIFORNIA PUBLICATIONS 

 Bulletin of the Department of Geology 



Vol. 3, No. 4, pp. 63=108. Pis. 5.16. ANDREW C. LAWSON, Editor 



TRIASSIC ICHTHYOPTERYGIA 



FROM 



CALIFORNIA AND NEVADA. 



BY 



John C. Merriam. 



CONTENTS. 



Introduction 63 



Forms from Upper Triassie of Northern California, Shastasaurus group ... 65 



Occurrence 65 



Characteristics of Shastasaurus 69 



Vertebras and Eibs 69 



Arches 76 



Extremities 79 



Skull 84 



Dentition 85 



Affinities and Classification 85 



Distribution and Synonymy 87 



Description of Species 89 



Shastasaurus perrini n. sp 89 



" osmonti n. sp. 93 



" alexandrse n. sp 96 



careyi n. sp 98 



altispinus n. sp. 99 



pacificus Merriam 102 



Forms from Middle Triassie of Nevada, Cymbospondylus group 103 



Cymbospondylus Leidy 103 



Cymbospondylus piscosus Leidy 104 



petrinus Leidy 105 



grandis Leidy 106 



Affinities of Cymbospondylus 107 



Bibliography 1 08 



INTRODUCTION. 



In the spring of 1895, the writer received from Professor 

 James Perrin Smith of Stanford University a number of 

 vertebra? and limb bones collected by him in the Triassie of 

 Shasta County, California. In the same year, these remains were 

 described and figured under the name of Shastasaurus pacificus 



