224 JOURNAL OF CONCHOLOGY, VOL. II, NO. 7, JULY, 1905. 



Thinking it possible that Geoinalacus might turn up in this particular 

 corner of the island, we did not allow a slug to pass unexamined, and 

 ihoush we did not come across it, it is just possible that this Lusitanian 

 relic may still linger in some unexplored ravine of this comparatively 

 unworked coast. 



One of the commonest species in this district, and indeed in all 

 Cornwall and south-west Devon, is ITvgroj/n'a gr^mulata; its distribu- 

 tion extending all over the shale and on a great part of the granite. 

 The shells of this species were often found to be as soft and collapsible 

 as those of Hygromia fiisca and Ilyg. revelata — a perfectly compre- 

 hensible state of things on a formation of granite and shale. 



The Arions reminded one of Irish and South Welsh specimens; 

 A. ater being often strongly banded and A. hoi'tensis very brilliantly 

 coloured. 



The following species were added to the census list : — 



Arion minimus. — One specimen, near Truro. 



Vitrea crystallina. — Two specimens at Nanjizal, one being var. 

 contracta Westl. 



V. nitida. — Falmouth and Penzance. 



Hygrom.ia fusca. — Falmouth and neighbourhood; Truro and 

 district. 



Vallonia COStata. — One specimen, Truro. 



Pisidium gassiesianum = {fnilium). — Small stream near 

 Penzance. 



P. obtusale. — Brackish marsh by Swan Pool, Falmouth. 



Vivipara contecta (Millet) m. sinistrorsum. — Instances of sinistrorsity 

 amongst the ViviparidEe are extremely rare, and as no occurrence of this ' sport ' 

 appears to have been recorded for V. contecta, it is interesting to note that in the 

 Manchester Museum collection there is a glass cube case containing a fine adult 

 shell (normal) and five young ones, apparently taken from it, one of them being 

 sinistral, the remainder dextral. This set of shells was formerly in the collection 

 of the late Dr. Alcock, who, as is well known, collected the species in abundance 

 at Southport, in 1864, or thereabouts, often in company with Mr. R. D. Darbishire, 

 to whom he presented this choice group. It is probable that neither ever thought 

 of recording this aberrant specimen, as I can find no mention of its occurrence in 

 such of the Society's records as I have access to, where one would have expected 

 to see it noted. — R. Si'ANDEN {Read before the Society, May loth, 1905). 



