MARSHALL: ADDITIONS TO "BRITISH CONCHOLOGY." 67 



Jeffreys' remark " not uncommon " would imply a common shell, 

 but this is not so, it is everywhere scarce. The Loch Boisdale speci- 

 mens belong to a depressed variety. 



Puncturella noachina L. — 14 — 9° fathoms. Liverpool Bay 

 (Tomlin) ; Loch Boisdale 30 f. ; and Barra 30 — 53 f. (Somerville and 

 J. T. M.) ; Oban, 14 — 25 f. ; Lamlash, 15 f. ; Doggerbank, 30 f. 

 Varies greatly in the height of the spire. A form almost as numerous 

 as the type has the spire less elevated and the base more expanded. 

 Jeffreys' figure represents the one, and Sowerby's the other. Another 

 form from the Clyde is compressed at the sides like var. priticeps, but 

 lias a depressed spire. 



Emarginula fissura var. subdepressa Jeffr. — Sutherlandshire 

 (Baillie) ! Scilly (Burkill and J. T. M.) ; Herm, low water ; Guernsey, 

 18 f. ; Loch Fyne, 25 f. ; Loch Boisdale and other parts of the 

 Hebrides. 



Var. elata Jeffr. — Sutherlandshire (Baillie)! Herm, low water ; 

 Guernsey, 18 f. ; Clyde, 18 f. ; Glenelg, ^o f. ; Loch Boisdale and 

 other parts of the Hebrides. 



Var. incurva Jeffr.— Lamlash, 18 f. ; Clyde, 18 f.; Loch Boisdale 

 and other parts of the Hebrides. 



Two monstrous specimens from Guernsey have a second growth 

 proceeding out of the original one, and look like two shells fitted one 

 in the other. Jeffreys' figure represents the type, and Sowerby's the 

 var. elata. 



E. rosea Bell. — Twenty-five per cent, of Guernsey specimens are 

 more conical than the type, the spire is less raised and does not over- 

 hang the margin, and the sides are more expanded ; they form a 

 passage to E. fissura through the var. incurva. No attention has 

 hitherto been given to the variation of the Channel Islands' mollusca 

 from the types of the British coast proper. It is full of curious 

 interest. 



E. crassa J. Sow. — The MacAndrew Collection contains two 

 small specimens said to have been found by Miss Roberts at Anglesea, 

 but the locality is doubtful. Specimens obtained underneath stones 

 at low water are usually badly stained and encrusted, but dredged 

 examples are snowy white, and show the microscopic sculpture well. 



Fissurella graeca var. gibba Jeffr.— Loch Creran near Oban 

 (A. Brown). 



Calyptraea chinensis L. — The Crag form of this species far sur- 

 passes the recent one in point of size ; it is if inch in diameter, and 

 was for that reason at first described as a distinct species. 



