6i 

 ADDITIONS TO "BRITISH CONCHOLOGY." 



(Continued from vol. 8, p. 395). 



By J. T. MARSHALL. 



(Read before the Society, July 14, 1897). 



SCAPHOPODA. 



Dentalium entalis var. anulata Jeffr. — In deep water off the 

 coasts of Yorkshire, Durham, and Aberdeen ; Sound of Sleat, 60 — 

 90 f. : the Minch, 45 — 70 f. 



Var. infundibulum Jeffr. — Generally distributed in suitable 

 localities. 



The "ring-like marks of growth " which Jeffreys attributes to the 

 var. anulata are individual, and common to all specimens ; gracilis 

 would have been a more suitable name. Examples from some of the 

 above records are much more slender than the Shetland form. It 

 lives in fine sand in deep water, while the var. infundibulum occurs 

 on rough ground ; the latter is really a stunted form, caused by the 

 action of a rough bottom wearing away and successively breaking off 

 the point. Numbers of the ends of D. entalis are sometimes brought 

 up by the dredge, having been cut off by the scraper. This would 

 indicate that the apex of the shell protrudes above the surface of the 

 sea-bed. 



D. vulgare Da Costa. — Bantry Bay specimens are coffee-coloured. 

 Monstrosities are rare, but an example from Guernsey is abnormally 

 curved. 



D. striolatum Stps. — Fierce Channel, 570 f. ('Triton'). D. agile 

 G. O. Sars also occurred at the same locality and depth (!) 



Cadulus jeffreysi Mtros. — Faerce Channel ('Triton'). Var. 

 tumidula G. O. Sars also occurred in the same cruise (!) 



Siphodentalium lofotense G. O. Sars. — Generally distributed 

 throughout the Hebrides on suitable ground — muddy sand in 10 — 95 

 f., with Axinus croulinensis. Without going through the tedious and 

 laborious process of mud-sifting, no one can hope to obtain this 

 species in any number. I will enumerate the localities that I have 

 collated — Off Cumbrae (Robertson) ! Strachur, Loch Fyne, 22 — 56 f., 

 and Shuna Island, 27 f. (Knight)! Rum Island, 33 f. ; Sound of 

 Sleat, 20 — 95; Loch Hourn, 20 f. and 75 f. ; Gairloch, 12 f. and 

 30 f. ; Minch off Barra, 50 f. ; and Loch Boisdale, 10 — 30 f. (Somer- 

 ville and J.T.M.); off Skate Island, 107 f. (Scott)! Rathlin Island, 

 (Chaster); off the western side of Lundy Island, 36 f. ; Tarbert, 

 75 f. ; Oban, 18 — 25 f. ; Loch Inver, 20 — 25 f. ; West Orkneys, 45 f. 

 It varies in the degree of curvature and in slenderness. 



