CLASS GASTROPODA 
39 
Trichotropis bicarinata Sowerby, 1825 
Tankerville, Catalogue, PI. 9. 
T. testa anfractibus, quinque, ultimo ventricoso, Carinas duabus validis. 
Long., iy 20 ; lat., 1 Y 10 poll. 
Shell with four or five volutions, the last of which is much larger than 
the others, and ventricose, smooth on the outside, with two prominent 
keels, which are ornamented with the numerous, strong, sharp-pointed, 
bristle-like processes formed by the epidermis. The aperture is large, and 
rather triangular; being, however, rounded externally, with two obtuse 
angles, and pointed at the base. The shell has a narrow, linear umbilicus, 
which is carinated on the outer edge, and its carina is bristly like those on 
the back; its inner edge is formed by the elevation of the edge of the inner 
lip. The columella is rather flattened. Shell white, translucent, epidermis 
pale horn color. (Sowerby.) 
Near the apex of the shell which was in the Tankerville collection, and 
which is now in the museum of Dr. Goodall, two Terebratulae were at¬ 
tached; on the body-whorl of one of the specimens brought home by Lieu¬ 
tenant Belcher, some small Balani have fixed their abode, and two of them 
are near the lip. Dr. Goodall’s specimen was said to have been brought 
from Newfoundland; those from which our description was taken were 
dredged up in from 10-15 fathoms in the Bay between Icy Cape and Cape 
Lisbon. (Sowerby.) 
Type in Tankerville Collection. Type locality, Arctic Ocean. 
Described as Turbo bicarinatus, Sowerby, in Tankerville Catalogue, 
Appendix, p. 12. 
Trichotropis conica Holier, 1842 
See Part II, Plate 31, fig. 12 
Index Molluscoruni Groenlandiae, 12: 
T. conica nob., testa subconica, subumbilicata, lutea; anfr. 6 angulatis, 
optimum teretiusculis, postremum ventricosioribus, lincis elatis longitudi- 
nalibus cinctis, quarum duae praecipue eminent, et harum inferior basim a 
superiore testae parte acute separat. L. 6"'Rs. (Moller.) 
Shell pyramidal, straw-colored, scarcely umbilicated; spire conical, 
elevated; whorls three-keeled with sloped sides; columella narrow, tor¬ 
tuous; aperture rather square, flattened anteriorly. (Conchologia I conica.) 
Type in British Museum. Type locality, Greenland. 
Range. Forrester Island, Alaska, also Greenland. 
[6411 
