1898-1902. No. 20.] BRACHIOPODS AND MOLLUSCS. 29 



east of Iceland. It has subsequently been described by HAGG under 

 the name of trichotropis tennis from 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 

 BRODERIP & SOWERBY (fig. 5) and trichotropis tennis E. A. SMITH (fig. 6). 

 From this form again POSSELT'S specimen, the Belgica specimen (fig. 7) 

 and HAGG'S two specimens lead us over to trichotropis hjorti, FRIELE 

 (fig. 8), which is either without spiral carina or has merely a faint indica- 

 tion of such 1 . Of the specimens mentioned here I have been able 

 personally to compare those found by the "Fram", "Belgica", and 

 "Michael Sars". 



Both trichotropis tennis 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. (POSSELT), 

 the east coast of Greenland 150300 m. (HAGG), 275 m. (GRIEG) and 

 east of Iceland, 600 m. (FRIELE). The typical form trichotropis bicari- 

 nata is known from Ice Cape (SOWERBY), Bering Sea (KRAUSE) and the 

 Sea of Okhotsk (MIDDENDORFF). 



Neptunea, siphonorbis, turrita, M. SARS. 



Locality: 



July 29. 1899. The winter harbour, Havnefjord, 12 m. One specimen. 

 Sept. 19. 1900. Off Forvisningsdalen, Gaasefjord, 440 m. Clay with small stones. 

 3 specimens. 



The specimeus have the following measurements: 



Height 24.5 mm. 35 mm. 35 mm. 41.5 mm. 



Largest Diameter 11 15 15.5 18 



Length of Aperture and Basal Canal 15 19 19 25 



Apex is smooth and depressed as in neptnna (siphonorbis} turrita 

 M. SARS s. tortuosa G. 0. SARS. The three larger specimens which have 

 a twisted basal must be referred to forma typica (G. 0. SARS, tab. 15, 



1 It has been impossible for me to ascertain in what relation the variety alta, DALL 

 stands to these forms, as I have not had access to the work in which this 

 variety is described. 



