328 Dr. Gwyn JefFrcys on 



Pleurotomidae. 



Ple\irotoma pyramidalis, Strom. 

 Biiccinum pyramidal e, Strom, in Nov. Act. Dan. iii. p. 296, f. 22. 



Body pale yellowish-white, with a faint tinge of purple in 

 front : tentacles rather short but slender, contractile : eyes 

 small, placed on angular projections on the tips of stalks, 

 which are thicker than the tentacles and are united with them 

 for about three fourths of their length : foot long, double-edged 

 and squarish in front, with angular corners ; bluntly pointed, 

 and occasionally cloven, behind : siphon short. Active. 



Godhavn, 5-20 fms. ; Waigat Strait, 15-25 fms. ; Station 4, 

 20 fms.; 5, 57 fms.; Holsteinborg, 10-12 fms.; St. 7, 

 1100 fms. (fragment). 'Lightning' Expedition, north of the 

 Hebrides, 189 fms. West Greenland (Moller). East Green- 

 land, 4-30 fms. (Mobius) . Spitzbergen, Iceland, Faroe Isles, 

 Novaya Zemlya, and Norway. Labrador to Cape Cod, 4-107 

 fms. Fossil: Norwich Crag (S. P. Woodward), and all our 

 post-Tertiary deposits, as well as those of Scandinavia and 

 Canada. 



The longitudinal ribs on the shell are sometimes more or 

 less wanting ; and the colour varies from chocolate to milk- 

 white. Spawn-capsules hemispherical and membranous. 



Fusus rufus of Gould, not Murex rufus {Pleurotoma) of Mon- 

 tagu ; F. jyleurotomariics of Couthouy ; and Defrancia Vahlii 

 of Beck, according to Moller. 



Pleurotoma hicarinata, Couthouy. 



Pleurotoma hicarinata, Couth, in Boston Journ. Nat. Hist. vol. ii. p. 104, 

 pi. i. f. 11 (1889). 



Body Avhite, with a faint tinge of yellow : head small : 

 month bulbous, cloven lengthwise : tentacles rather short but 

 slender, club-shaped at their tips or points : eyes small, black, 

 placed on thick stalks, which are united with the tentacles 

 for three fourths of their length at their outer base : foot thick 

 and broad, double-edged and gently curved in front, with 

 slight angular corners ; bluntly pointed, squarish, or else more 

 or less indented behind : siphon cylindrical, of moderate length, 

 slit throughout, with a wide and folded-back opening. Active 

 and not shy. 



Godhavn, 5-25 fms. ; Waigat Strait, 15-25 fms. ; Station 4, 

 20 fms.; 5,57 fms. {var. pallida) ; Holsteinborg, 10-12 fms. 

 Greenland (Moller and others) ! Wellington Channel (Bel- 

 cher) ! Gulf of St. Lawrence (Whiteaves). North- Atlantic 



