346 MARSHALL: ADDITIONS TO “‘ BRITISH CONCHOLOGY.” 
Lepton squamosum Mont.—Low water mark at Salcombe 
(Norman) to 20 f. Glengariff, dredged alive just off the 
harbour (Span). 
L. nitidum var. convexa Ald.—Found everywhere with the 
type, but scarcer ; 10 per cent. is about the average. It is 
not more convex than the type, and the pit-marks vary from 
fine to coarse. 
Var. pisidialis Jeff—-Guernsey, 18 f.; Scilly, 40 f.; Torbay; 
Connemara, 12 f.; Iona, 20 f. This variety depends on its 
shape ; the sculpture is as variable as in the type. 
“ Differs in the degree and even in the absence of 
sculpture. The variety /evzs is perfectly smooth; and I must 
correct or qualify my remark in the ‘British Conchology’ 
that this species is invariably sculptured” (Jeffreys, Moll. 
‘Lightning’ and ‘ Porcupine’ Exp.).* The variety evzs is 
occasionally found on our coasts ; but the difference is so 
slight from the type, which is always apparently smooth, 
that I consider the distinction too slight to warrant a 
varietal name. 
The young of Ke//ia suborbicularis var. lactea may be 
mistaken outwardly for Z. zz¢t¢dum; but the umbones of the 
former are more prominent and obtuse. 
Jeffreys’ plate has a section showing concentric strize, as 
in Z. sudcatulum; but this is incorrect—it has only irregular 
though very noticeable lines ot growth, as in Sowerby’s 
figure. 
L. sykesii Chast.—(See J. of Mal, June 1895, vol. 4, 
pp. 36-7). Mount’s Bay (Tregelles and Chaster) ; Dogs 
Bay, Connemara (Standen); Killala Bay (Chaster and 
J.1.M.); off St. Martin’s Point, Guernsey, 18 f. (J.T.M.); 
from sand dredged at Guernsey (Chaster). 
L. sulcatulum Jeff.—Isle of Man (L.M.B.C.); Scilly (Burkill 
and J.T.M.); Jersey, Guernsey, and Herm, in sea-weeds at 
* Proc. Zool. Soc., June 7, 1881, p. 604. 
J.C., viii., Jan., 1897. 
