340 MARSHALL : ABDITIONS TO “ BRITISH CONCHOLOGY.” 
with those from Iona and other localities. The former 
usually attain one-third of a line, but the latter are only 
one-fourth the bulk. Gzvyzza does not vary in shape like 
Argiope, but is always uniform. i 
Crania anomala Miull.—Low water to oof. It is difficult to 
procure the undervalve, as it practically becomes part of 
the rock to which it attaches itself. 
Var. alba Jeffi—Oban (Heathcote and Chaster). Adventure 
Bank, Mediterranean, g2 f. 
PELECYPODA 
Anomia ephippium L.—Forbes & Hanley give good figures 
of vars. aculeata and sguamuda in “British Mollusca.” 
A. patelliformis L.—-Low water to 86f. The var. striata 
occurs in the estuarine deposits of N.E. Ireland (Praeger)! 
Pecten pusio L.—Jeffreys quotes “Shetland to Cornwall, 585 
fathoms,” for this species, but it is a well-known Channel 
Islands’ shell, where it lives at low-water mark. It may also 
occasionally be taken at low water in South Devon. 
P. varius var. purpurea Jeff—Bristol Channel. L. 3°0; 
Bae SO: 
P. opercularis var. tumida Jeff.—Aberdeenshire (Simpson)! 
Var. elongata Jeff—Guernsey, 20 f.; Kilbrennan Sound, 
55 f. 
P. incomparabilis Risso.—Isle of Man (Leicester)!; Suther- 
landshire (Baillie) !; Loch Boisdale, 2o—7o f. (Somerville 
and J.T.M.). 
P. striatus Mull.—Eddystone, 30 f. ‘The white form is rare ; 
I have two from Shetland. 
P. vitreus Chem.—Off Unst, N.E. from Haroldswick, 90 f., 
one specimen (A. Brown); S.W. Ireland, 200 f. (Royal 
I.A. cruise, 1886)! British Channel 567 f. (“Porcupine”). 
This has a very wide range. ‘The recorded localities of 
the ‘ Challenger’ Expedition are—West coast of Patagonia, 
140—400 f.; S. Japan, 345 f.; Philippines, 1oo—7o0 f. 
J.C., viii., Jan., 1897. 
