Affinities.—In the basis being sometimes permeated towards the circumference by pores, and by the colouring (the other species in this and the next section being dirty white), [B. patellaris] has almost as strong a claim to be ranked in the last as in the present section: in the rounded summits of the radii, and in the state of the basis, it, perhaps, shows more affinity to [B. improvisus] than to any other species; it is, however, almost equally allied to [B. glandula].
27. [BALANUS] CRENATUS. Pl. [6], fig. [6 a]-[6 g].
B. CRENATUS. Bruguière. Encyclop. Method. (des Vers) 1789.
LEPAS FOLIACEA, var. a. Spengler. Skrifter af Naturhist. Selskabet, b. i, 1790.
---- BOREALIS. Donovan. British Shells, Pl. 160 (1802-1804).
B. RUGOSUS. Pulteney (?) Catalogue of Shells of Dorsetshire, 1799.
— ------ Montagu (?) Test. Brit. 1803.
— ------ Gould (!). Report on Invertebrata of Massachussetts (1841), fig. 10.
B. GLACIALIS (?) J. E. Gray. Suppl. Parry’s Voyage, 1819.