320 Marine Shells of. Massachusetts. 
Station. This species lives in mud below low- 
water mark. ! 
Habitat. Harbour of New Bedford. 
Remarks. During the summer. of 1839, two 
dredging-machines -were. worked in the harbour of 
New Bedford. This species was found in the mud - 
thrown up , with several others rarely or never found 
above low-water mark. Mr. Shiverick has found it 
at Clark’s Cove, in Dartmouth. It resembles F'usus 
harpularius, but the presence of a very distinct sinus, 
as well as the coarseness of the revolving striae, read- 
ily distinguishes it. 
CERITHIUM TEREBRALE. 
Plate HI. Fig. 7. 
està parva, elongata, fuscá, sepe ioca, abs. duo- 
"hs planulatis, cum quatuor elevatis lineis; spirà tevsi, conicå ; 
suturå subimpresså ; aperturà ovata, aws 
Syn. C. Emersonii, var. Pe 
Shell small, elongated, brown, nena with a 
white band, with rather slight incremental striae ; 
whorls eleven or twelve, flattened; spire seven- 
eighths of the length of the shell, bradi of its 
bulk, its opposite sides: containing an angle of about 
20°, conie, with four elevated, obtuse, revolving lines 
. on each whorl, of which the first and second, and 
third and fourth are equidistant ; the space between 
the second and third is obviously less on the upper 
whorls, but approaches to an equality with the other 
Spaces, in the growth of the shell: the first three 
ridges are equal, and the fourth small and depressed, 
