390 PLEUllOTOMID^. 



corded it as Norwegian (Bergen to Finmark) ; and it 

 has also been taken on the sariie coast by M^4ndrew 

 and Barrett^ Danielssen^ Sars^ and Lilljeborg^, at depths 

 of from 30 to 150 f. 



My largest specimen of this graceful and remarkable 

 species exceeds an inch in length. 



As LoA-en well observed, it is allied to P. torquatum 

 of Philippic a Calabrian fossil; but the dimensions 

 and figure given in the latter^s work represent a much 

 less slender shell. The lines of growth vary in strength_, 

 and are not so conspicuous in living as in dead speci- 

 mens. 



9. P. septangula'ris"^, Montagu. 



Murex septangidm'is, Mont. Test. Br. (i.) p. liBO, t. 9. f. 5. Mangel ia 

 {Belli) se2)fangukiris, F. & H. iii. p. 458, pi. cxii. f. 6, 7, and (animal) 

 pi. TT. f. 3. 



Body white, powdered with minute flake-white points : 

 mantle rather thick at the edges : palUal tube fleshy, extending 

 beyond the canal of the shell : Jiead compressed, narroAv, with 

 a vertical fissure below it, from which the retractile proboscis 

 issues : tentacles short, " setose " [?], coalescing at their bases: 

 eges on the external points of thick stalks annexed to the ten- 

 tacles, at about two-thirds of their length : foot rather narrow, 

 truncated in front, and slightly auricled, moderately long, with 

 the termination nearly as broad behind as in front, without a 

 trace of a distinct point, although the tail is often more or less 

 notched. (Clark.) 



Shell forming an elongated cone with a produced base, re- 

 markably thick, opaque, somewhat glossy : sculpture, strong, 

 angular, and rather prominent longitudinal ribs, which extend 

 to the suture but not to the base ; they are flexuous on the 

 body-whorl, and nearly straight on the upper whorls, where 

 they usually form a continuous series along the spire ; their 

 interstices are concave ; the labial rib is very large, and aged 

 specimens frequently have a similar rib or varix on the middle 

 of the body-whorl ; there are from 7 to 9 ribs (usually 7 only) 

 on the body-whorl, and one less on the next whorl, the number 



* Heptagonal, or having seven angles. 



