Plcistoccjic lunma of Sankaty Head. — Cushnian. 171 
List of Species. 
I. 
Lower Bed 
Common 
Common 
Several 
Not common 
Common 
One speci'n 
One speci'n 
RIollusca ( Gastropoda^ 
Solariella obscura Coutli 
Odostomia impressa Say 
" tritida Gould 
Turbonilla interrupta Totten 
Scala groenlandica Perry 
Crepidnla convexa Say 
" fornicata Lamk Abundant 
]ilana Say Common 
Crucibukim striatum Say 
L rosalpinx cinerea Say 
Eupleura caudata Say 
Astyris Umata Say 
Lunata heros Say 
var. triscriata Say 
Xevcrita duplicata Say 
Cingula aculeus Gould 
Skenea planorbis F. iS: H 
Diodora noachina Gray....- 
Caecum pulchellum Stimp 
Cerithiopsis greenii C. B. Adams. 
Buccinum undatum Linn 
Nassa trivittata Say..\ 
(Ilyanassa) obsoieta Say.... 
Chrysodomus curta Jeffreys 
Trophon scalariformis Gould 
Crustacea. 
Balanus crenatus Brug 
" eburneus Gould 
" porcatus 
Eupagurus |)ollicaris Say One speci'n 
Panopeus sp 
2. 
Serpula 
Bed 
Fourspec'ns 
Upper Bed 
(B. S. N. H.) 
Few 
Few 
I speci'n (v) 
(also.Vlerrill) 
One speci'n 
Common 
X 
One speci'n 
Two spec'ns 
4. Frag- 
ment 
Bed 
Frag- 
ments 
Few 
Few 
Common 
Common 
Common 
Common 
Few 
Several 
Range 
S 
S 
S 
N 
S 
s 
S 
N. S. 
N. S. 
S 
N 
N 
N 
S 
S 
N 
S.N. 
^S 
N 
N 
S.N. 
S 
N.(N.) 
S 
S 
There arc, according to his observations, four main fossil- 
iferous beds, marked 1-4 on the section as here given. This 
division in place of the older idea of two beds gives additional 
characters from which certain conclusions may he drawn as 
to the fauna. 
It- is the aim of the writer to present the data in regard to 
the fauna of these four beds in a simple manner. Several new 
species have Ijcen added since the publication of professor 
\'erriirs paper in 1875. These additions for the most part 
substantiate the conclusions drawn by professor \'errill in 
regard to the faunas of the different beds, that is. the original 
* Bxact bed not given, referred provisionally to this bed either by Prof. 
Verrill or bv the writer. 
