108 Couthouy's New Species of Mollusca 
My own collection. 
Cabinets of Bost. Soc. Nat. Hist., A. A. Gould, M. D., 
Boston, and John C. Jay, M. D., New York. 
Description. Shell fusiform, elongated, tapering to 
an acute point, of an uniform dark fawn-color, sutures 
distinct, whorls seven to nine, covered with rounded 
undulating ribs or plaits, to the number of eighteen upon 
the lowest, alternating with each other at the sutures, 
and most prominent on the superior whorls; in some 
instances these folds become obsolete about midway on 
the body-whorl, which is nearly half the length of the 
shell, with delicate, transverse strie near its middle; in 
some individuals these stri& are apparent on all the 
whorls ; outer lip tranchant, smooth internally, the edge 
forming a regular outward curve; a slight compression 
is perceptible about its middle portion; columella arcu- 
ated superiorly, its inferior third inclining, rather abruptly, 
to the left ; aperture an elongated oval, terminating in a 
brief sub-ascending canal. 
OssEenvATIONs. This elegantly formed little shell was 
taken from the stomach of a cod, caught near Lynn. 
It appears to be rather uncommon, as only two perfect, 
and as many broken specimens, were found, in examining 
more than three hundred fishes. 
It closely resembles F. pyramidàtus, Brown's MSS., 
found at St. Abbs Head, England, differing from it prin- 
cipally in the form of its aperture and number of its ribs. 
TRICHOTROPIS COSTELLATUS. 
Plate III. fig. 2. 
T. testA ovata, turrito-acutà, fuscescente, epidermide foliaceà luteo- 
albidà tectà ; cdm canaliculata ; anfractibus costis 5 rotundatis in- 
structis; apertura ovali, lutescente ; labro costis indentato; columella 
, albescente. 
