72 



VERTEBRATA. 



No. 118. [345] Ichthyodonilite. 



Fossil Dorsal Spine, 

 on slab (cast). From the 

 Lias of Lyme-Regis, Eug- 

 lanii, and now in tlie Ward Collection of the University of Rochester. 



Size, 20 X 5. 



No. 119. [1304] 



Pelecopterus perniciosus, Cope. 



Pectoral Spines (cast). 

 This represents one of a few 

 species of large fishes, known 

 only by their spines and shoul- 

 der girdles, which Cope makes 

 the type of a family, Pelecop- 

 teridiie. This remarkably per- 

 fect specimen shows the pec- 

 toral girdle complete. From 

 the Upper Cretaceous (Colo- 

 rado group), of Trego Co., 

 Kansas. , and now in the Mu- 

 seum of Columbia College. 



Size, 4 ft. 1 in. X 3 ft. 6 in. 



No. 120. [1308, 1310] 



Rhyssodus (Cochliodus) latus, Leidy. 



Two Teeth (cast). These are 

 examples of the broad, crushing 

 "pavement" teeth, which were char- 

 acteristic of the Devonian and Car- 

 boniferous Sharks, and are now 

 found in the Cestracion oi Australia. 

 From Keokuk division of the Sub- 

 carboniferous, Warsaw, Illinois. 



Original in the A. H. Worthen Collection. 



No. 121. [181] Acrod-us Anningiae, Agassiz. 



Lower Jaw (cast). 

 This remarkably fine 

 specimen exhibits an al- 

 most complete series of 

 teeth, retaining the po- 

 sition they occupied dur- 

 ing life. There are eight 

 transverse rows on each 

 side, with a central row 

 at the junction of the two 

 rami. The teeth of the 

 posterior row are marked with the striae characteristic of the genus. The 

 specimen was found in the Lower Lias, Lyme-Regis, England, and belongs to 

 the E. C. H. Day Collection, Charmouth, England. 



