MARYLAND GEOLOGICAL SURVEY 45 



Eschrichtius cephalus Cope, 1869, Proc. Acad. Nat. Sci. Pliila., vol. xxi, i^p. 10, 11 



(mention only). 

 Eschrichtius cephalus Leidy, 1869, Jour. Acad. Nat. Sci., Phila., 2nd ser. vol. vii, 



p. 442. 

 Cetothermm cephalus Cope, 1890, Amer. Nat., vol. xxiv, pp. 612-615, tigs. 7, 8; pi. 



xxii. 

 Cetotheriwn cephalus Cope,_ 1896, Proc. Amer. Pliilos. Soc, vol. xxxv, p. 146, pi. 



xii, figs. S, 3. 



Description. — The description given for this form by Cope in 1867 

 is as follows : " The mandibular rami measure 9 feet 4 inches and 

 were referred to an individual 31 feet long. They were compressed, 

 and with a narrow superior ridge, without nutritive foramina. The 

 hitherto known Miocene Whales — Balaena prisca and B. palae- 

 atlantica of Leid}^ — founded on portions of the mandibular rami, were 

 much less compressed, were furnished with numerous marginal nutritive 

 foramina, and the B. prisca was without superior ridge." 



In 1890 he added; "The ear bulla is noticeably compressed, some- 

 what incurved, and with a nearly parallelogrammic outline from the 

 side." 



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

 ent river, shore of Chesapeake Bay. 



Collections. — Philadelphia Academy of Natural Sciences. Johns 

 Hopkins University. 



Genus SIPHONOCETUS Cope. 

 SiPHONOCETUS EXPANSUS CopC. 



Plate XXV, Fig. 3. 



Megaptera expanm Cope, 1868, Proc. Acad. Nat. Sci. Phila., vol. xx, p. 193. 

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

 Eschrichtius expansus Leidy, 1869, Jour. Acad. Nat. Sci. Phila., 2nd ser., vol. vii, 



p. 422. 

 Cetotherium expansum Cope, 1890, Amer. Nat., vol. xxiv, p. 614. 

 Siphonocetus expansus Cope, 1895, Proc. Amer. Philos. Soc, vol. xxxiv, p. 140, pi. 



vi, lig. 5. 



Description. — The specimen was originally referred (1868) to Mega- 

 ptera because of a supposed difference between the cervicals and those 

 of Eschrichtius. In 1869 the jaw was discovered to have the typical 

 form of Eschrichtius. The following is the description given of the 



