•1-i SYSTEMATIC PALEONTOLOGY 



" The mandible of this species is unknown. The size is not far from 

 that of the Cetotherium pusillum and Siplionocetus expansus of Cope. 

 Should either of these turn out, on the discovery of the skull, to be 

 Cetotheriform, it will become necessary to compare them with the 

 present species. The total length of the animal was about twenty or 

 twenty-five feet." Cope, 1895. 



Occurrence. — St. Mary's Formation. Cove Point. 



Collection. — Johns Hopkins University. 



Cetotherium parvum Trouessart. 

 Plate XXV, Fig. 1. 



Belaenoptera pusilla Cope, 1868, Proc. Acad. Nat. Sci. Pliila., vol. xx, p. 159. 

 Uschrichtius pusillus Cope, 1868, Proc. Acad. Nat. Sci. Phila., vol. xx, p. 191. 

 Eschrichtius pusillns Cope, 1869, Proc. Acad. Nat. Sci. Phila., vol. xxi, p. 11. 

 Cetotherium pimllum Cope, 1890, Amer. Nat., vol. xxiv, p. 616. 

 Cetotherium pwillnm Cope, 189.5, Proc. Amer. Philos. Soc, vol. xxxiv, p. 145, pi. 



yi, fig. 6. 

 Cetotherium parvum Trouessart, 1898, Catalogus Mammalium, p. 1071. 

 Cetotherium parvum Hay, 1902, Bull. 179, U. S. Geol. Survey, p. 599. 



Desci-iption. — In 186'8 Cope said of this form that it was the smallest 

 known fin whale, being about 18 feet long. In 1895 he says : " The 

 fragment of the ramus of this species above referred to is longer than 

 any that have come under my observation, which now number five 

 individuals. Its length is T23 mm., and the diameters at a fracture 

 near the middle are as follows: vertical, 71 mm.; transverse, 47 mm. 

 It is a little larger than those I have seen hitherto, but agrees with 

 them in every respect." 



Occurrence. — St. Mary's ( ?) Formation. Near the mouth of the 

 Patuxent river. 



Collection. — Johns Hopkins University. 



Cetotherium cephalum Cope. 



Plate XXI, Fig. 1; Plate XXII, Figs, la, lb, 2a, 2b; Plate XXIII, 

 Figs. 1, la, lb; Plate XXV, Figs. 8, 13. 



Uschrichtius cephalus Cope, 1867, Proc. Acad. Nat. Sci. Phila., vol. xix, pp. 131, 

 144, 148. 



Eschrichtius cephalus Cope, 1868, Proc. Acad. Nat. Sci. Phila., vol. xx, p. 195 (men- 

 tion only). 



