302 JOURNAL OF CONCHOLOGY, VOL. I3, NO. ID, APRIL, I912. 



whose collection of ' Porcupine' shells is said to " contain at least four 

 species grouped under the name of formosa ; " and this has been 

 further complicated by Boog Watson (or his artist) in his description 

 and figures, which also do not tally.' I have previously endeavoured 

 to clear this up so far as I could with tlie material at hand,^ but the 

 position of this species has been left in an eminently unsatisfactory 

 state. 



Dr. Kobelt in his recent work cites C. forfiiosa Jeff, as a variety of 

 Pleurotoniella packardi Verrill,^ as to which I cannot express any 

 opinion, not having seen Professor Verrill's shell. 



Pleurotoma nana Lov. — Aberdeenshire, West Orkneys 45!'., 

 E. Shetlands 2o-4of., between the Orkneys and Shetlands 5i-85f., 

 and Flugga, North Shetlands (Simpson) ! Shetland specimens are 

 spindled, smaller, and narrower than those further north. Jeffreys 

 figures the Shetland form, but gives the dimensions of the Norwegian 

 one. The latter is well figured by Sars. 



P. Striolata Phil. — Freshwater West (Cooper) ! Jersey, Babba- 

 combe Bay, Achil Island, Killala Bay. The Mediterranean form 

 differs from the British one in being only half the size, with coarser 

 spiral striae. 



P. attenuata Mont. — Alderney (Marquand); Scilly Islands, one 

 specimen (Smart); Aberdovey, Harlech, and Tenby. L. o'sin., b. 

 0T50. The interior is occasionally coloured brown. Although Gwyn 

 Jeffreys says this " differs from P. striolata in being more slender," he 

 gives it the same dimensions, which are incorrect. There is a great 

 similarity between the two species, and the extreme forms of each 

 closely resemble one another, but when fresh the interstitial striae of 

 P. striolata will always distinguish it. P. teniiicosta Brugnone is a 

 variety of this having visible spiral sculpture ; but Brugnone's shell is 

 a Ficarizzi fossil, and has not been recorded as recent. 



P. COStata Don. — Whorls 7-8, the four lowermost having the 

 specific sculpture, and the uppermost being similar to those of P. 

 striolata. L. o'25in., b. o"i. 



Var. coarctata Forb. {/oiirii. of Conch., 1893, vol. vii., p. 262). — 

 Whorls 8-9 ; 1. o"4in., b. o"i5. In tiiis variety the whorls are not only 

 individually longer, but there is an additional one, and the colouring 

 is of a linear character, somewhat similar to that of/*, attenuata. It is 

 supposed to be northern and the type southern, but there are a few 

 exceptions in each case ; I have dredged this at Guernsey and Scilly, 

 and there is an intermediate form occasionally met with, in which 

 the characters of both are combined. 



1 Challenger Gastropoda, p. 350. 



2 Sykes : Moll. ' Porcupine ' Exp., Proc. Malac. Soc, 19&6, vol. vii., pp. 179-180. 



3 Icon. Europ. Meeresconch., vol. iii., p. 282. 



