22 AMERICAN MARINE CONCHOLOGY. 
Subgenus Admete, Kroyer. 
Mdller, Naturhist. Tidskr., iv. 88. 1842. 
Shell ovate, thin, covered with an epidermis; spire acute, last 
whorl ventricose; aperture oval, chanelled anteriorly ; columella 
with a few obsolete rudimentary folds; outer lip thin, simple, 
acute. 
This group appears to represent Cancellaria in the northern 
seas in the same manner that Yrophon represents Murex, and 
Bela certain species of Mangelia. 
2. C. vinipuLA, Fabricius. Fig. 24. 
(Tritonium.) Fauna Greenlandica, 402. 1780. 
Cancellaria buccinoides, Couthouy, Bost. Journ. Nat. Hist., ii. 105, t. 3, f. 3. 
Cancellaria Couthouyt, Jay, Cat. 1839. 
Admete viridula, Stimpson, Check Lists, No. 6. 
Shell oblong, longitudinally obscurely ribbed, spirally lined, 
spire acughindted: whorls rounded, suture strong ; aperture short, 
smooth, Poteet obsoletely pindteelé white, ander a pale green 
epidermis. Ten to forty fathoms. 
Massachusetts to Arctic Ocean. 
Genus TRICHOTROPSIS, Brod. & Sowb. 
Zool. Journ., iv. 373. 1826. 
Shell thin, ventricose, keeled, umbilicated ; aperture longer than 
the spire, compressed into a partial canal in front; epidermis 
horny, rising into hairs at the angles of the shell; operculum 
horny, nucleus at one side. 
There are about a dozen species, principally of arctic distribu- 
tion. 
e 
1..T. BOREALIS, Sowerby. Fig. 25. 
Zool. Journ., iv. 373, t. 9, f. 6, 7. 1826. 
T. costellatus, Couthouy, Bost. Journ. Nat. Hist. ii. 108, t. 3, f. 2 
Shell ovate-rhomboidal; whorls four, the last very broad, and 
encircled by four or five, and the others by two prominent, fringed 
ribs, and crossed by minute and regular elevated lines. Fifteen 
to twenty fathoms. 
From Massachusetts northward, Northern British Coasts. 
