22 AMERICAN MARINE CONCIIOLOGY. 



Subgenus Admete, Kroyer. 



Moller, Naturhist. Tidskr., if. 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 Gancellaria in the northern 

 seas in the same manner that Trophon represents Murex, and 

 Bela certain species of Mangelia. 



2. C. viridula, Fabricius. Fig. 24. 



{Tritonium.) Fauna Gromlaiidica, 402. 1780. 

 Cancellaria buccinoides, Coutkouy, Bost. Journ. Nat. Hist., ii. 105, t. 3, f. 3. 

 Gancellaria Coutkouy i, Jay, Cat. 1839. 

 Admete viridula, Stimpson, Check Lists, No. 6. 



Shell oblong, longitudinally obscurely ribbed, spirally lined, 



spire acuminated ; whorls rounded, suture strong; aperture short, 



smooth, columella obsoletely plaited; white, under a pale green 



epidermis. Ten to forty fathoms. 



Massachusetts to Arctic Ocean. 



Genus TEICHOTROPSIS, 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 



horn}', nucleus at one side. 



There are about a dozen species, principally of arctic distribu- 

 tion. 



1. T. borealis, Sowerby. Fig. 25. 



Zool. Journ., iv. 373, t. 9, f. G, 7. 1826. 

 T. costellatus, Coutkouy, 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. 



