10 TRANSACTIONS, NATURAL HISTORY SOCIETY OF GLASGOW. 



M. subtruncata (Da C). — Frequent ; more coarse in appearance 

 than those found so abundantly on our Ayrshire shores. 



*M. stultorum, L. — " Portrush, and abundant on the 

 Derry coast " (Praeger). It is, indeed, abundant — finely 

 marked living, or perfect, though dead, specimens being 

 everywhere obtainable. The distribution of this handsome 

 shell is somewhat peculiar. It is the typical mollusc of the 

 north-east coast of Scotland, being very plentiful on the 

 sandy beach near Aberdeen. Down the west coast there is 

 a solitary record of its discovery at Oban by Mr. Alex. 

 Somerville, who states also that, in 1888, a valve was shown 

 him which had been picked up by Miss Kallenberg in 

 Islay. Smith and Landsborough both record it from the 

 Clyde, the former naming Ayr and the latter Lamlash Bay 

 as their respective localities ; but Mr. Alfred Brown, who 

 refuses to admit the shell as a genuine Clyde mollusc, sug- 

 gests that possibly they may have intended by the name not 

 the stidtorum of Linnaeus, but the stultorum of Pennant, 

 which is our M. subtruncata, Da C. This, however, can 

 hardly be the case, as J. Smith records it as " frequent " 

 on the Irvine and Ardeer beaches, and Coulson has taken 

 it on the Ardrossan shore. 



*M. stultorum, var. cinerea, Mont. — Rather scarce, with the type. 

 " Magilligan " (Thompson). 



*Lutraria elliptica, Lmk. — " On the Derry coast it is very 

 abundant " (Praeger). I obtained some large valves. 

 Scrobicularia prismatica (Mont.). — "Magilligan" (Thompson). 

 The valves of this rare and beautiful shell were tolerably 

 abundant, and, as a rule, longer than those obtained in 

 Clyde waters. It is generally distributed throughout the 

 West of Scotland, but nowhere in great abundance, except 

 (according to Alfred Brown) off Ardrishaig Pier, in 6 fathoms. 

 S. alba ( Wood). — Not so plentiful as the foregoing species, and 

 all the valves obtained were very small, and more thin and 

 glossy than those got in, for example, Loch Goil or the 

 Gareloch. 

 Sofon ensis, L. — Very scarce at Port-Stewart. 



*S. siliqua, L. — Very common all along the sands, but none very 

 large. 



