and Shells of Massachusetts Bay. 111 
Fusus turriculus, Mont. 
Nassa acuta, Say. 
These last four are common in the stomachs of fishes 
taken abreast of Cape Ann. 
Acteon trifidus, (Jaminia?) Totten. Steamboat 
landing, Chelsea. i 
Polyclinum ? Upon an old shell in our outer 
Botryllus stellàtus, Pallas. Seen covering the bottom 
of a vessel that had lain several months at one of 
the wharves in Boston. 
Ascidia rástica, Lin, abundant in vicinity of Nahant. 
* — microcósmus, Cuv., wharves and bridges near 
Boston. 
* . antestindlis, Lin. Found on old sunken logs, 
&c. in our harbor. à 
* — pedunculdta, Lam.  Nantasket Beach near 
Hull. 
For the very accurate drawings of the shells repre- 
sented in the accompanying plates, I am indebted to 
the kindness and skill of Dr. A. A. Gould; to whom 
I am also under obligation, for the free use of the valua- 
ble notes, made by him upon such of the species as 
have fallen under his observation, while engaged in re- 
searches into this department of Natural History, for the 
| Survey of the State of Massachusetts, now in progress. 
It affords me much pleasure to learn, that others have 
been induced, by the success attending my examinations 
of the stomachs of fishes, to pursue a similar course ; 
and that several more new species have been thereby 
already discovered. I would express the hope, that ere 
long our Bay may be explored by the dredge. The 
richness of the accessions which such researches would 
not fail to bring to light is here sufficiently indicated. 
