70 



VERTEBRATA. 



unequal rows. The scales are wrinkled, and sometimes hexagonal, sometimes 

 tetragonal. This specimen belongs to the Krantz Collection, and is from the 

 lithographic limestone of Eichstadt, Bavaria. Size, 2 ft. 2 in. x 7 in. 



No. 112. [320] Microdon (Pycnodus) elegans, Agassiz. 



Skeleton, on slab (cast). This 

 beautiful ganoid, with homocer- 

 cal tail, and small, uniform teeth, 

 is a true Pycnodus, according to 

 Wagner. The specimen is from 

 the lithographic limestone (Upper 

 Oolite) of Kelheim, Bavaria, and 

 is now in the Museum of the Uni- 

 versity of Munich. 



Size, 10 X 10. 



No. 113. [324] G-yroduS Circularis, Agassiz. 



Skeleton, on 

 slab (cast). This 

 fish has the exteri- 

 or form of Pycno- 

 dus. The anal and 

 dorsal tins are sus- 

 tained by long 

 rays in front, and 

 diminish rapidly; 

 the caudal is deep- 

 ly notched. The 

 teeth are elliptical, 

 and are character- 

 ized by a groove running around the summit. This fine specimen, from the 

 lithographic slates of Solenhofen, Bavaria, is in the Museum of the University 

 of Munich. Size, 2 ft. 6 in. x 1 ft. 5 in. 



No. 114. [326] G-yrodus umbilicus, Agassiz. 



Palatal Teeth, on slab (cast). This spe- 

 cies is characterized by a depression in the 

 middle of the teeth. This fine series of palatal 

 teeth was found in the Upper Oolite at Durr- 

 heim, Grand Duchy of Baden, and is in the 

 same Museum as the preceding. 



