120 AMERICAN JOURNAL 



quite a different shell from that figured in the Conchological 

 Manual, and by Chenu. 



The forms appear to be as follows : 



T. bicarinata, typical. 



Turbo bicarinatus, Sby., Tank. Cat. p. xii, No. 1401, pi. 9, f. 

 1—2. Thes. pi. 285, f. 8. 



Shell of three whorls ; spire from the intersection of the outer 

 lip with the body whorl to the apex less than two fifths the 

 whole length. Columella very broad, especially at the lower 

 end, where it is truncated. Aperture rounded, hardly pointed 

 below ; umbilical region broadly excavated, wide, and carinated. 

 Width of the shell almost equal to its height. 



Den. 90°. Very solid and thick. 



Habitat. — Newfoundland, Sowerby. Plover Bay, Eastern 

 Siberia, Dall. Three specimens were obtained on the beach. 



T. (bicarinata, var. ?) alta. 



Shell of four whorls, spire from the intersection of the outer 

 lip, one-half the length of the shell. Columella nearly as broad 

 as in the last. Aperture rounded, proportionately narrower and 

 smaller than in the last. Umbilical excavation very much nar- 

 rower and smaller, anteriorly falling behind the elevated outer 

 edge of the columella, while in the last it is more prominent and 

 in advance of the columella, of which the outer edge is but slightly 

 elevated. Width of the shell less than three-fourths of its height. 



Defl. 76°. Solid and strong. 



Habitat. — Plover Bay, E. Siberia, one specimen, Dall. Re- 

 volving strias cover the whorls, absent in the last. 



Trichotropis (bicarinata var. ?) spectabilis, Dall. 



Shell of five whorls, spire, as before, one-half the length of 

 the shell. Columella narrow, waved, not truncate, straight, not 

 arched, as in the two preceding. Aperture proportionately 

 larger than in the last, but smaller than in the typical form, 

 painted within and on the columella with sea-green, sharply 

 pointed below. Outer edge of the columella strongly elevated. 

 Umbilical excavation reduced to a mere groove behind the colu- 

 mella. Whorls much flatter above and below than in the others. 

 Spire acuminated, while the last whorl is wide out of proportion 

 to it. Whorls marked with revolving striae. Second carina ap- 

 parent on all the whorls, while in the others there is only one 

 carina on the upper whorls. Width of the last whorl equal to its 

 height, and to three-fourths the whole height, while in the last 

 the width of the last whorl is considerably less than its height. 



