.IAMKS A. GRIEG. [SEC. ARCT. EXP. FRAM 



BRODERIP & SOWERI;Y. 

 (Figs. 4-8). 



Locality: 



.Inly --. 1DOO. Th<- winter hai'luiur. I laviiel'jnnl. ahoul (111 in. Small stones. A 

 ratlin clama.u'eil specimen measuring: total height 30 mm., largest 

 diameter ^4 mm., length of aperture 17 nun., breadth of aperture 

 13 HUM. 



Tin- shell (fig. 4, h) is quite thin, translucent, white and covered 

 by a >kin-hke wrinkled dirty yellowish-white epidermis. Sculpture con- 

 n-Is of close, fine, oblique, longitudinal lines. Fine spiral striae are 

 al-o vi>ible under the microscope. Number of whorls 6, of which the 

 last is decidedly ventricose. The apical whorls are white, smooth and 

 convex. The last whorl is furnished with two sharp spinal carinae, 

 which are densely covered with large well-develoved setae. The penul- 

 timate whorl has a setiferous spiral carina. The two remaining whorls 

 seem also to be furnished with spiral carinae, but it was impossible to 

 examine them closely owing to their being covered by a sponge. Aper- 

 ture i> nib-circular and somewhat more than half the length of the shell. 

 Umbilicus deep and partly covered by the columella, which is excurved 

 and has a slight indication of a canal at its base. On the outer side 

 the umbilicus is bounded by a sharp carinae, which like the spiral 

 carinae is thickly covered with setae. Operculum (fig. 4 cl is triangular 

 i.'i ) (\.~t mm.) and of the same form and structure as in triclwtropis 

 li/orfi, FRIELE. Radula also resembles that of this species. 



The specimen belongs apparently to the variety tricliotropis teniiix 

 from (Irinnell Land described by SMITH: though SMITHS specimen, which 

 was of about the same size (33 mm.), appears to differ from it in having 

 a more slender and more tapering spire, and further does not seem to 

 have Mich well-developed setiferous filaments on the spiral carinae or 

 on the umbilical carina. This latter carina moreover in the Fram speci- 

 men i> placed in a position more resembling that of trichotropis biccu'i- 

 iwitfi I3ROi>. A: Sow. ((If. Tryon: Manual of Conchology, vol. ( J, tab. 7. 

 lig. 4^1. The whole appearance of the specimen too reminds one iml 

 only of t>-irli(tlr<>i>ix k'Hiiis but also of tt'icliotr<>/>/x hi<-<trin<it(t. and 

 I am accordin-ly most inclined to accept the view of .Ji:rn:i:Ys that 

 h-irl/oli-n/,is (I-HHIK i> a ..... nstroiis variety of the last-named. 



\Ve inii-t aUo inclinle l,richotroi>ix lijorti, FRIELE as a varielv of 

 trirltfilni/iix tiiitiix. a fact I have already alluded to in the report on 

 the "liel-ira" expedition of 100.".. This form was first discovered in 

 P.MKI by the Noise Fishery Steamer "Michael Sars" in the cold area 



