16 
Genus BALANUS. 
Conical or elongated-conical, composed of six unequal 
preces or valves, closed at the sides upon a more or 
less firm testaceous flat base : shell open at the top, 
operculum of four moveable valves. 
B. Communis. Pultney.— Mont. p. 6.—Dor. Cat. 
t 2. f. 12.—Lepas Batanus, Lin. 1107.—D. p. 14. 
—Pen. 4. p. 72. t. 37. f. 4.—Don. t. 30. f. 1.— 
Turt. D. p. 77.—Ch. f. $20.—Born. t.1. f. 4.— 
B. Suucatus. Lam. 2.—Brug. p.1. 63.—Strong, rug- 
ged, cinereous-brown, compartments unequal and 
frequently indistinct, composed of irregular and lon- 
gitudinal striee or ridges ; conical, detached shells often 
perfectly round at the base and sloping upwards; 
aperture not large in proportion: operculum of four 
valves, transversely striated, with a longitudinal furrow 
3 
on the two longest. Diam. at base, 1.—%. Not 
uncommon but local. 
B. Vuucaris. Da. Cos. p. 248. ¢. 17. fi. 7.— 
List. t. 444, f. 87.—Inst. Ang. 5. f. 41.—LeEpas 
Bauanorwes. Lin ?—D. p. 16.—Turt. D. p. 77.— 
Wood G.C. p. 44. t. 7.’ f.3.—Pen. 4.'t. 37. Ff. 5. 
—Don.t. 36. f. 2.—Mont. p. 7.— Inst. t. 444. f. 287. 
—Ch. f. 826.—B. Batanores. Brug. p. 166.— 
An B. Ovuraris ? var. Lam. 8?—Subconical, some- 
times much depressed, valves divided by a deep longi- 
