236 JORDAN: ON tHE GENUS PUSCS. 



very few of the shells of the ' Porcupine ' expedition are in the 

 National Collection, the bulk has probably gone,, with the 

 ' Knight Errant ' and ' Triton ' shells, to America, with the late 

 Dr. Gwyn Jeffreys' collection. It is very greatly to be regretted 

 that the trustees of the National Museum could not see their 

 way to buy Dr. Jeffreys' collection when it was offered to them, 

 as it contained so many of the types of our British species. 

 The loss is all the greater because Dr. Jeffreys did not live 

 to complete the Report on the MoUusca of the ' Lightning,' 

 ' Porcupine,' and ' Valorous ' expeditions. 



That Report terminates with the Ceritluopsidce. Had one 

 more part been completed it would have embraced the genus 

 under notice. Dr. Jeffreys, however, says that F. attemiahis is 

 not a variety of Tritojiiiim turritum of M. Sars, the infer- 

 ence from this is that they resemble each other. 



Mention is made in the 'Porcupine ' Report, 1869, of "an 

 undescribed species oi Fusiis allied to F. Sabini" having been 

 taken off Valentia (stations 2 to 9), 85 — 80S fathoms, but I am 

 unable to find any further notice or figure or description of the 

 shell. 



The following seven species were taken in the Faroe channel 

 in the ' Knight Errant' (1880) and 'Triton' (1882) expeditions, 

 which were under the direction of Dr. John Murray. 



Although the very interesting facts recorded by that dis- 

 tinguished Naturalist are well known, it may, nevertheless, be 

 well to mention briefly, that the sea bed lying between the 

 Hebrides and the Faroe Islands — a submarine area now known 

 as the 'Faroe channel' — is traversed by a mountainous submarine 

 ridge 2000 feet (330 fms.) high, named the ' Wyville-Thomson 

 Ridge.' The depths on either side of the ridge are about 600 

 fathoms and on the ridge 200 — 30c fathoms. The area on the 

 north-east side of the ridge has been termed the ' cold area,' 

 the bottom temperature at one station, in 540 fathoms, being as 

 low as 29-2^ P'ahr. On the south-west side of the ridge is the 

 ' warm area,' the bottom temperature, in 570 fathoms, being 



J.C., vi., July, 1890 



