328 Dr. Crwyn Jeffreys on 



Pleurotomidae. 



Plenrotoma jii/ramidalis, Strom. 

 Bi(ccinum j)>/ranndak, Strom, in Nov. Act. Dan. iii. p. 296, f. 22. 



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

 front : teiUndes 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 : siplion 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-Tei'tiary deposits, as Avell 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. 'pleurotomarius of Couthouy ; and Defrancia Vahlii 

 of Beck, according to Moller. 



Pleurotoma hicarinata^ Couthouy. 



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

 pi. i. f. 11 (1839). 



Body white, 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, Avhich 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. [\ ax. pallida) ; Holsteinborg, 10-12 fms. 

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

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



