lS6 JOURNAL OF COIsCHOLOGY, VOL. I4, NO. 6, APRIL, I9I4. 



Loripes lacteus L. — Mr. Robert Dawson has dredged a valve 

 off Cruden, and Professor Macgillivray found some valves on the 

 sands at Belhelvie, but it is essentially a southern species. Sowerby's 

 figure represents the var. desmarestii. 



The shell varies greatly in convexity and obliquity, and also in the 

 angularity of the margins. Specimens from Palermo are unusually 

 large and solid, exceeding an inch in length and breadth. 



L. divaricatus L. — Specimens from the Scilly Islands agree with 

 the Mediterranean form in size, convexity, and texture, and are 

 markedly different from the valves occasionally washed ashore at the 

 Land's End. 



Lucina borealis L. — This shell is usually circular in outline, but 

 occasionally it is broader than long and vice versa. There is also great 

 diversity in the number of riblets, even in specimens living together. 

 Many examples from Scilly are ribbed only on the umbonal area, the 

 lower riblets coalescing and disappearing towards the margins. It is 

 most abundant and attains a large size in the Salcombe Estuary — i^ 

 inches. Gwyn Jeffreys' valve from Tenby (2 inches) must have been 

 quite exceptional, and has not been repeated, but specimens such as 

 the one noticed by him as containing a " pearl " are not uncommon, 

 where living in shallow water, and especially in shifting sands at the 

 mouths of rivers, where they are liable to the intrusion of .sand particles, 

 which are then cemented over. I have a large series containing these 

 internal excrescences or "pearls." 



var. gibba Jeff. — Salcombe, Torbay, Tenby i2f., Gairloch 2 2f. 

 Mr. Marquand's record of Z. borealis being "common at Alderney," 

 and Mr. Tomlin's " common at Herm,"^ should be relegated to this 

 variety, the type being almost unknown in the Channel Islands, 

 though I have one specimen from Herm. 



Axinus J. Sow. — Professor Dall has revived the Thyaslra of Leach 

 for a section of Axinus, and Professors Verrill and Bush that of 

 Leptaxlnus for another section. 



A. croulinensis Jeff. — Off Skate Island loyf. (Scott) ! Loch Ryan 

 2 of.. North Rona ^of 



var. truncatus Marsh, n. var. — Proportionally broader than the 

 type, and inequilateral in consequence of the posterior side being 

 truncated, while the hinge-plate on that side is reflected and leaf-like. 

 Dredged in the Shetlands, in 85f , by Jeffreys, who did not notice the 

 differences between this and the Hebridean and Doggerbank forms, 

 which is obliquely oval and only half the size. The Norwegian and 

 Faroe forms also belong to this variety, as well as those dredged by 

 the ' Porcupine' on the Portugal coast in 1095 fathoms. The figures 



I Marine Shells of Guernsey, etc., Trans. Giiern. Soc. Nat. Sci., 190T, p. 5. 



