Prof. Bailey on Fossil a7id Recent Infusoria. 339 



YII. Fossil Infusoria of Nova Scotia. — Specimens of fossil 

 fluviatile infusoria have been sent to me for examination from 

 two localities in Nova Scotia. The first was sent by J. W. Daw- 

 son, Esq. from Earlton, Colchester County, Nova Scotia; and the 

 second was received from Owen Mason, Esq. of Providence, R. I., 

 but the precise locality in Nova Scotia from which the latter was 

 obtained, was not mentioned. Both these specimens present all 

 the characters of the purely siliceous infusorial deposits so com- 

 mon in our peat bogs. They are both very white, light, and 

 free from sand. The species most abundant in the specimen 

 from Earlton, are Pinnularia viridis^ C'occonema cymbiforme, 

 Gomphonema acuminatum, Eimotia Moriodon, E. Pentodon, 

 E. serra, Gallionella distans, Ilimantidium arcus, Surirella 

 sple?idida, Siauroneis Baileyi, Spongiolites lacicstris, S. erina- 

 ceus, &c. 



In the specimen sent by Mr. Mason, the chief forms noticed 

 by me were the following : Pinnularia viridis, P. incequalis, 

 Cocconema cymhiforme, Gallionella distans very abundant, Hi- 

 mantidium arcus, Tahellaria trinodis, Eunotia Monodon, E. 

 Diodon, Synedrai valens, &c. No Spongiolites were seen. This 

 specimen is remarkably pure, and free from any mixture of sand 

 or organic coloring matters. 



VIII. Fossil Infusoria with the Bones of the Mastodon. — I 

 have been furnished by Mr. Connors with specimens of the marl 

 and clay in which was imbedded the admirably preserved head 

 of the Mastodon giganteus, discovered in 1843, in Scotchtown, 

 Orange County, New York. The clay and marl were collected 

 at the time the bones were exhumed, and I was assured by Mr. 

 Connors that the marl of which he gave me specimens was a 

 portion collected by himself, of that in which the bones were 

 imbedded. This marl is of a light ash-gray color, and contains 

 numerous well preserved fresh-water shells of recent species, 

 among which were several common species of Planorbis, Cyclas, 

 and Lymnasa, some of which still retained their epidermis. 



In order to ascertain if this marl contained any siliceous infu- 

 soria, I treated it with diluted hydrochloric acid to dissolve out 

 all calcareous matter, and to concentrate in a small mass such in- 

 soluble bodies as might be present. The insoluble portion thus 

 obtained v/as then washed, diffused on glass in Canada balsam, 

 and examined by the microscope. Among the bodies detected, 



