PACHYCORMIDiE. 
403 
Fig. 41. 
Outlines of Rostra of Protosphyrcenci in lateral aspect and transverse section, 
one-half natural size. 
No. 1. Protosphyrcenci tenuirostris, A. S. Woodward.—Cambridge Greensand. 
[Woodwardian Museum, Cambridge.] 
No. 2. Protosphyrcenci corepressirostris, A. S. Woodward.—Kentish Chalk. 
[No. P. 5631.] 
No. 3. Pi'otospkyrcenci ferox, Leidy.—Kentish Chalk. [No. P. 5630.] 
No. 4. Protosphyrcena keepingi, A. S. Woodward.—Cambridge Greensand. 
[Woodwardian Museum, Cambridge.] 
2 D 2 
