202 JOURNAL OF CONCHOLOGY, VOL. I4, NO. 7, JULY, I914. 



var. truncata Marsh. — Portstewart, Antrim (Knight)! Mochras 

 Island, North Wales (Cooper) 1 The Marquis di Monterosato writes 

 me that this variety conforms to D. atlantica Hidalgo. 



var. cuneata Marsh. — Besides having the posterior end wedge- 

 shaped and gaping, this variety is smaller, thinner, and much more 

 depressed. 



D. trunculus L. — A dealer was selling this pseudo-British species 

 in 1885-6, ostensibly from South Devon, to various collectors for a 

 small sum ; but some of the specimens being submitted to me by a 

 purchaser, I was able to recognise them as Mediterranean, and not 

 British as represented, although this dealer may possibly have been 

 himself deceived by a more experienced naturalist. His account to 

 me was that in the spring of 1885 several Brixham trawlers from South 

 Devon, on arriving at his port for the usual season's fishing, brought 

 him some trawl refuse from their coast, and that he found in it eight 

 specimens of D. trunculus. However that may be, I subsequently 

 discovered that he was at the same time selling Cardiiim papillosxim 

 and Loripes divarkatus, also for very small sums, and also ostensibly 

 from the South Devon coast, where these very rare species have 

 never been found. 



Mactra solida var. intermedia Jeff. — Scarborough, very fine 

 (Tomlin). 



M. glauca Born. — The Jersey habitat for this fine shell is 

 situated in a dangerous locality in the south-east part of the island 

 known as La Rocque, and should not be negotiated without a local 

 guide or fisherman, easily to be obtained in the neighbourhood. M. 

 glauca is found sparingly in the coarse sandy patches which occur 

 among the rocks, living comparatively near the surface, and easily 

 procurable with a fork or spade ; but the safest and most prolific 

 locality is on the further side of a lofty and prominent quadrangular 

 tower, where the rocks terminate and the large sandy bay of Grouville 

 commences. (I have known 40 specimens taken here in one tide). This 

 picturesque tower, situated among a wilderness of rocks, is readily 

 accessible between tides, and is always kept provided with fuel, so that 

 any one cut off by the tides or shipwrecked may obtain shelter and 

 fire until they are relieved. The tides recede here to an enormous 

 distance, while still beyond the uncovered rocks extend for miles 

 towards the coast of France, which is plainly in view. On reaching 

 these rocks and looking backward on Jersey the stranger is at first 

 appalled at the apparent disappearance of the island and at the utter 

 chaos of rocks which surround him. But it is all safe enough while 

 the tides are receding and tlie key to the position is kept in view ; 

 it is when the tides return that the danger is great, as the incoming 



