MARYLAND GEOLOGICAL SURVEY 89 



Galeocerdo producitis Agassiz, 1856, Kept. Pac. R. R. ExpL and Surv., voL v, p. 314, 



pL i, tigs. 1-6. 

 Galeocerdo productus Agassiz, 1856, Amer. Jour. Sci., ser. ii, vol. xxi, p. 273. 

 Galeocerdo latidens Emmons (errore) 1858, Rept. N. Car. Geol. Survey, p. 239, fig. 



68 [non fig. 69 ; cuts 68 and 69 interchanged). 



Description. — " A species with the dentition very similar to that of 

 the existing G. ardicus but of smaller size. Anterior coronal margin 

 much arched and finely serrated; the apex above the posterior notch 

 short, broad, and sharply directed backwards; margin below the pos- 

 terior notch relatively short in the principal teeth, with large serra- 

 tions." — A. S. AA^oodward. 



The teeth of this species occur with rather more frequency than those 

 of G. latidens, but are by no means abundant. The specimen shown in 

 Plate XXXII, Fig. 11, is an average-sized specimen of one of the 

 principal teeth. 



Occurrence. — Calvert Formation. Charles county near the Patux- 

 ent river. Plum Point, Fairhaven. 



Collections. — Maryland Geological Survey, Philadelphia Academy of 

 Natural Sciences, Museum of Comparative Zoology. 



Galeocerdo triqueter n. sp. {ex Cope MS.). 

 Plate XXXII, Fig. 13. 



Description. — Teeth very robust, with elevated crowTis, smaller and 

 less twisted than those of G. contortus, and more faintly serrated along 

 the coronal edges. Anterior margin only slightly arched, posterior 

 notch inconspicuous. Root similar to that of G. contortus, and general 

 aspect suggestive of Oxijrhina macrorhiza from the Lower Cretaceous. 

 Height of crown in median line on outer face of the type-specimen 

 9 mm., on the inner face G mm., thickness of crown at its base 3.5 mm., 

 thickness of root 5 mm. 



The somewhat worn specimen upon which this species is founded 

 appears to be unique, nothing like it having been found since the 

 Thomas Collection, of which it forms a part, was first brought to- 

 gether. The trivial title adopted for it is taken from a manuscript label 

 of Cope's attached to the specimen, which bears witness that he regarded 



