1398—1902. No. 20] BRACHIOPODS AND MOLLUSCS. 99 
east of Iceland. It has subsequently been described by HAgG under 
the name of trichotropis tenuis trom the east coast of Greenland where 
it also was found by the “Belgica” in 1905. To this form too belongs 
probably the specimen from Baffin Bay which PosseLt mentions, and 
in which, out of three carinae, only the central spiral carina was visible. 
For it is a peculiarity of trichotropis hjorti that the whorls are without 
spiral carinae or else that the carinae are only very slightly developed. 
We have thus the following series of developments: the Fram speci- 
men (fig. 4) forms the intermedian stage between trichotropis bicarinata 
Broverip & Sowersy (fig. 5) and trichotropis tenuis E. A. Situ (fig. 6). 
From this form again Possett’s specimen, the Belgica specimen (fig. 7) 
and Hica’s two specimens lead us over to trichotropis hjorli, FRIELE 
(fig. 8), which is either without spiral carina or has merely a faint indica- 
tion of such?. Of the specimens mentioned here I have been able 
personally to compare those found by the ‘Fram’, “Belgica”, and 
“Michael Sars’. 
Both trichotropis tenuis and trichotropis hjorti are associated with 
the cold area; but whereas the former is only found in quite shallow 
water — Kane Bassin, 46 m. (SmiTH) and Jones Sound, 60 m. — the 
latter is meth with at considerable depths — Baffin Bay, 476 m. (PossEtt), 
the east coast of Greenland 150—300 m. (Hage), 275 m. (Grige) and 
east of Iceland, 600 m. (Fritz). The typical form trichotropis bicari- 
nata is known from Ice Cape (Sowzrsy), Bering Sea (Krause) and the 
Sea of Okhotsk (MmppENDORFF). 
Neptunea, siphonorbis, turrita, M. Sars. 
Locality: 
July 29, 1899. The winter harbour, Havnefjord, 12 m. One specimen. 
Sept. 19. 1900. Off Forvisningsdalen, Gaasefjord, 4—40 m. Clay with small stones. 
3 specimens. 
The specimeus have the following measurements: 
Height . . . . ... . . . 245mm, 35mm. 35 mm. 41.5 mm. 
Largest Diameter. . . . . .- 11 , 15, 155, 18 , 
Length of Aperture and Basal Canal 15, 19, 19 , 2 , 
Apex is smooth and depressed as in neptuna (siphonorbis) turrita 
M. Sars s. tortuosa G. O. Sars. The three larger specimens which have 
a twisted basal must be referred to forma typica (G. O. Sars, tab. 15, 
1 It has been impossible for me to ascertain in what relation the variety alta, Dat 
stands to these forms, as I have not had access to the work in which this 
variety is described. 
