CYCLOSTREMA. 291 



all our coasts, from low-water mark to 25 f. Raised 

 sea-bed at Fort William (J. G. J.); Calabria (Philippi); 

 Vaderoarna, in the south-west of Sweden, 12 f. (Malm); 

 Croisic, Loire- Inferieure (Cailliaud); Gulf of Lyons 

 (Martin); Mediterranean (coll. M f Andrew); Magnisi in 

 Sicily (Philippi); State of Maine, "littoral, found occa- 

 sionally clinging to the under side of wet stones, above 

 low-water mark " (Mighels) . 



Clark says, " it is active, marches with quickness, not 

 at all shy, and gave me good opportunities of observing 

 its peculiarities." In Shetland it deposits its spawn in 

 thick irregular clusters on some of the finer and mem- 

 branous sea-weeds ; each cluster contains a great num- 

 ber of fiy, having their shells completely formed, and 

 enveloped in a glairy matter. 



It is the Skenea divisa of Fleming, and Delphinula 

 lavis of Philippi. The authors of the ' British Mol- 

 lusca' do not appear to have given a sufficient reason 

 for preferring the later name " divisa " to that by which 

 Montagu published this species. Philippics specimens 

 (only three in number, two recent and one fossil) may 

 have been accidentally discoloured, as is sometimes the 

 case. 



C. ? costulatum {Margarita ? costulata, Moller) has 

 been dredged by Mr. Barlee in Loch Fyne, by Mr. 

 Waller on the Turbot Bank near Lame in Antrim, bv 

 Mr. Dawson in the Moray Firth, and by myself in 

 Shetland ; and Mr. Bean found a specimen in sand 

 dredged at Lamlash in the Isle of Arran. I do not, 

 however, consider any of the specimens thus procured 

 recent. It occurs in a fossil state at Fort William 

 (J. G. J.) ; Paisley (Crosskey) ; and at Uddevalla. 

 The most southern point where it has been observed in 

 a living state is Ireland ; it inhabits the Arctic seas of 



o 2 



