24 TRANSACTIONS OF THE [1888 



surface or a few feet below it, while loose specimens sometimes 

 occur at a depth of twenty feet below the summit of a hill. 

 Those of the upper levels are apt to be embedded in slabs or masses 

 of ferruginous sandstone, especially in such pieces as prove to 

 have been previously indurated green marl. From these we 

 have extracted very distinct casts, fitting into clearly marked 

 moulds, of Turritella mortoni, Fectuneuhos stamineus, Crassatella 

 alta, and Dosiniopsis meekii. Of the first two, besides Glycimeris 

 elongata, we have secured enough of the shell to readily identify 

 the species. Deeper down in the hills the same fossils are 

 em^Dedded in a matrix of more aluminous mixed greensand, and 

 they are often much less firm, or even mere films covering the 

 forms of the original casts ; but occasionally, good specimens of 

 these occur, with most of the shell in firm condition. The 

 greater number of the hills above Annapolis show the Dosinia, 

 Turritella, or Cardita, either as cast or mould, enveloped by or 

 adhering to the pieces of ferruginous sandstone which lie 

 scattered over the surface. 



South of Annapolis, the most conspicuous deposit of the 

 Eocene fossils appears in the vicinity of the South river bridge. 

 North of the bridge, the Ostrea compressirostra lies scattered 

 remotely over the surface of the low eminence or sticks out of 

 the sides of ravines, sometimes accompanied by indurated marl 

 containing specimens of Dosinia, Pectunculus, and Cardita 

 planicosta. Across the river, however, on and in the low hills 

 bordering the drains emptying into Glebe Creek, large beds of 

 the Eocene limestone rest in the marl, and masses two or three 

 feet thick by four or five feet in length project above the surface. 

 These are packed with more or less silicified shells and their 

 casts, among which we have observed large numbers of Ostrea 

 compressirostra, Cardita planicosta, and incalculable numbers 

 of Pectunculus stamineus, and forms which resemble Crassatella 

 and Dosiniopsis. Turritella mortoni and T. humerosa are also 

 found here, besides some exceptionally large specimens of 

 Crassatella alta and C. alaeformis (?). A few blackened sharks' 

 teeth [Lamna elegans) occur in the same deposits, accompanied 

 by fragments of the teeth of Notidanus primigenius. The fossils 

 here are chiefly in the clean gray greenstone, while those of the 



