MARSHALL: ADDITIONS TO “ BRITISH CONCHOLOGY.” 363 
Var. elliptica Brown.—Dr. Norman writes that ‘‘the Scandi- 
navian naturalists seem agreed that this is Linne’s 4. com- 
”1 Tf the Scandinavian 
pressa, and not A. compressa Mont. 
naturalists are infallible, this must be so; but are they? 
Jeffreys says that the “Venus compressa of Linne’s Mantissa 
Plantarum is much too indefinite for identification, and no 
habitat is: given.”” And Mr. Edgar Smith writes: “ The 
Venus compressa of Linne is altogether beyond recognition, 
and may either belong to this genus, as suggested by some 
authors, or it may bea species of Veneride.”® 
Var. minor Jeff.—Much smaller. Sound of Sleat, 2o—4o f.; 
Loch Boisdale, 35 f. (Somerville and J.T.M.). 
Var. trigona Jeff.Sloping from the beaks on each side, 
the lunule on the anterior side being consequently shal- 
lower and less curved; it is not unlike Venus fasctata in 
outline. Milford Haven. 
Var. fusca Polii—Shape almost as variable as the type, 
according to habitat; often obscurely rayed. Dogger- 
bank, 20—4o0 f. 
Var. multicostata Jeff.—Shape variable; ribs 36—4o. 
Off Aberdeen (Simpson)! ; Doggerbank and Aberdeenshire. 
A. compressa Mont.—The very young are striated, but the 
beaks are smooth and polished. In comparison with the 
same stage of A. sudcata, the beaks of the latter are more 
acute, and the lunule deeper. In aged specimens, the 
margins are considerably thickened and the beaks separated. 
The extra-British range of this species is extraordinary— 
3 to 2,000 fathoms. 
Var. globosa Moll.—Clyde, 18 f. 
A. triangularis Mont.—-Locally abundant. They may be 
dredged in thousands off the Eddystone and at Guernsey. 
r. Ann. Mag. Nat. Hist., ser. 6, vol. 12, p. 364, Nov. 1893. 
2. Moll. ‘Lightning’ and ‘ Porcupine,’ Proc. Zool. Soc., 1881, p. 711. 
3. J. of Conch., vol. 3, p. 204, 1887. 
