342 GINGLYMACONCHA. PECTINIDZ. 
I have never seen a British specimen of Pecten Jacobeus : 
Montagu’s specimen is marked Mediterranean, I have there- 
fore omitted it in this work. 
Shells longer than high; sculptured with thick divaricating 
ribs ; the left valve flattish ; the right valve convex, with a 
slender simple notch ; the auricles equal. 
1. PECTEN MAXIMUS. 
Shells with concentric, elevated striolee, with divaricating 
ribs longitudinally striated; the epidermis of the right valve 
yellowish-white, red beneath the umbones ; the left valve white. 
Length six and a half inches ; height five and a half inches. 
Ostrea maxima, Bonann. Reer.t.u. f.8; Lister, dnim. Angl. 
t.v. f.29; Conch. t. clxin. f. 1; Petiv. Mus. t. lxxxvi. no. 
829; Linn. Faun. Suec. 2148; Syst. Nat. 1144. no. 185; 
Regenf. Conch. 1. t. u. f. 19; t. vii. f. 3; Chem. Conch. vii. 
t. lx. f. 585; Gmel. Syst. Nat. 3315; Brug. Encycl. Méth. 
t. ecix. f. 1. a, 6.; Donov. Brit. Shells, t.xlix. ; ewe. 
Trans. Linn. Soc. vii. 96; Dill. Desc. Cat. 247; Turt. 
Conch. Dict. 128. 
Pecten maximus, Penn. Brit. Zool. iv. 99. t. lix. f. 61; Mont. 
Test. Brit. 143; Flem. Edinb. Encyel. vi. 97 ; Lam. Hist. 
Nat. des Anim. sans Vert. vi. part. 1. 163. 
Var. 3. The left valve yellowish-white, pamted with pale 
fuscous, or pale saffron-fuscous concentric bands. 
Inhabits the European ocean in deep water ; and occurs very 
frequently in estuaries or the mouths of rivers. 
The general colour of this species is white or brick-red, 
simple or variegated; sometimes mottled with brown or pur- 
ple; inside white, generally margined with chocolate or purplish- 
brown. 
The animal is dirty-white, the region of the liver bluish- 
black ; the branchiee testaceous-saffron. 
The variety is common in the Friths of Forth and Clyde; 
the Provost of Eton and General Bingham inform me that it 
is common at Weymouth. 
