3 5 2: Van Winkle on Mollusc a 



DimeJisions of type. — Height 14 mm. ; width of body whorl 

 7 mm. 



This specimen has an original label which reads ' ' Drawn by 

 Sowerby for theSI." 

 Boreotrophon tenuisculpta (Carpenter) i865. PI. i. Figs. 6-9. 



Tropho7i tenuiscidptus Carpenter, Rep. Brit. Ass. Ad. Sci. for 

 1863, 1864, p. 25 ; Ann. Mag. Nat. Hist., 3rd ser., vol. XVII, 

 p. 277, 1866 ; Reprint Smith. Misc. Coll. 252, 1882, p. 324. 



Not Ti'ophon temiisculptiis Try on Man. Conch. 1880. vol. 11, 

 pi. 33, fig. 359 (after Kobelt, Klister, Conch. Cab. t. 76, f. 9.) 



Tropho7i {Boreotrophon) tenuisculpta Arnold Mem. Cal. 

 Acad. Sci. 1903, vol. Ill, p. 253. 



Boreotrophon tenuiscidptus Dall, Proc. U. S. Nat. Mus. 1902, 

 vol. 24, p. 541. 



Original Description. — "7". testa T. Barvice^isi simili, sed 

 sculptura minus extante ; vertice nucleoso minimo ; anfractibus 

 uno et dimidio laevibus, apice acuto ; normalibus v., tumidis. 

 postice subangulatis, suturis impressis ; costis radiantibus x.- 

 xiv., plerumque xii., hand varicosis, angustis, obtusis ; liris 

 spiralibus majoribus, distantibus, quarum ii.-iii. in spira mon- 

 strantur, aliis intercalantibus, supra costas radiantes undatim 

 transeuntibus ; tota superficie lirulis incrementi, supra liras spir- 

 ales squamosis, eleganter ornata ; canali longiore, subrecta, vix 

 clausa ; labro acutiore, postice et intus incrassato, dentibus circ. 

 V. munito ; labio conspicuo, Isevi ; columella torsa. 



Hab. Sta. Barbara, Pleistocene formation {Jewett). 



This very elegant shell is like the least-sculptured forms of 

 T. Barvicensis, from which it appears to differ in its extremely 

 small nucleus. It is ver}^ closely related to T. finibriatidus , A. 

 Ad., from Japan, but differs in texture, and is regarded by Mr^ 

 Adams as distinct. It stands on the confines of the genus, 

 there being a slight columellar twist, as in Peristernia.'" 



Dimensions of specimeyis. — Height 16 mm ; max. width body 

 whorl 8 mm.; height 13 mm.; max. width body whorl 7 mm. 



There are two specimens of this species, on the original card, 

 labelled "type." , 



