12 TRANSACTIONS OF THE [ocr. 28, 
Below stratum. 11, I was unable to examine the stratification 
on account of the tough grass which had overgrown the bottom 
of the cliff and resisted the means of excavation which I had at 
hand. Underneath the white sand, according to Mr. Scudder, 
there is about 4 ft. of coarse gravel and sand which in turn is 
underlaid by a brown sandy clay extending downward to the 
sea level. The lower shell bed is composed of reddish clayey 
sand like that the Gardiners’ I., and contains chiefly Venus mer- 
cenaria and Ostrea Virginiana, the latter being especially abun- 
dant. Angular pebbles of 14 in. or less diameter are numerous. 
The shells of Mya, Venus and Ostrea lie in all positions, the 
valves being often separated. The following is a list of species 
collected by the writer : 
MOLLUSCA. 
. Ilyanassa obsoleta Stm. 
Crepidula fornicata Lam. 
i plana Say. 
convexa Say. 
Odostomia trifida Gould. 
Turbonilla interrupta Ad. 
Mya arenaria Linn. 
Ensatella Americana Ver. 
Cumingia tellinoides Con. 
Venus mercenaria Linn. 
Scapharea transversa Ad. 
Modiola hamatus Ver. 
B. Ostrea Virginiana Lister. 
bd od bd 
73 
WH 
Nore.—B indicates that the species has also been found in the 
upper bed by Prof. Verrill or the writer. 
Many of the oyster shells were honeycombed by the borings 
of Cliona sulphurea Ver. 
The Serpula bed at the bottom consists of detached masses 
of Serpula dianthus Ver. closely packed together and intermixed 
with yellow sand and some clayey matter, while at the top the 
calcareous tubes are very much comminuted. Much of the 
Serpula is overgrown with the Polyzoan, Hippothoa variabilis 
Ver. According to Mr. Scudder, who superintended the exca- 
vations made in 1875 the bed in question was ‘almost wholly 
devoid of other fossils,” but at the point where I examined it I 
found an abundance of shells of various species, viz.: 
1. Ilyanassa obsoleta Stm. 
2. Fusus searlariformis Stm. 
