History of British animals - University of Guam Marine Laboratory

282 MOLLUSCA. BRANCHIFERA. Doris.Gen. XXXV. DORIS.— Oral, tentacula two ;vent destituteof scales.131. D. Ar go,— Body nearly smooth ; branchial plumesabout twelve in number.Linn. Syst.i. 1083. Penn. Brit. Zool. iv. 43. t. xxii. t.22Among thesea-weeds and crevices of rocks near low water-mark, common.The usual length is about 3 inches, convex above, and rounded at each extremityof a lemon-yellow ;colour, slightly freckled, sometimes tinged withbrown. Spawn white, gelatinous and compressed.132. D. verrucosa.— Cloak closely covered with prominenttubercles ;branchial plumes about 24 in number.Penn. Brit. Zool. iv. 43. t. xxi. f. 23. Cuvier, Ann. Mus. iv. t. lxxiii.f. 4, 5 Common with the preceding; frequently cast ashore bystorms.Length about an inch, of a whitish colour, more or less freckled withbrown. The tubercles are rough, and of different sizes, those at the base ofthe "upper tentacula are compressed they are ; pervious at the summits.Margin entire, waved. Tentacula round and smooth towards the base, compressedand imbricated towards the summit. Branchial plumes arranged ina semicircle, those at each end shortest.133. D. Icevis.— Cloak smootli in the middle, slightly tuberculatedtowards the margin; branchial plumes 8 in number.Mull. Zool. Dan. t. xlvii. f. 3-5—Common among the Zetland Isles.Length about half an inch, rounded in front, narrow behind ;of a milkwhitecolour.134. D. marginata.— Cloak smooth, tinged with pink ; anundulating membranaceous border, usually four pointed, infront.Mont. Linn. Trans, vii. Id. t. vii. f. 7-— Coast of Devonshire.Length about a quarter of an inch, oval, whitish ;tentacula wrinkled ; thebranchial plumes are figured as 7 in number, and the head as slightly emarginate.This species is certainly distinct from the D. loevis of Muller, to whichMontagu refers it ; though it may be no other than the D. electrina of Pennant,whose notices, however, are too imperfect to give much weight to theconjecture.135. D. nodosa.— Cloak with four equidistant papilla? oneach side the medial line.Mont. Linn. Trans, ix. 107- t. vii. f. 2—Coast of Devon.Length about half an inch ; white, with a tinge of pink on the back. Footbroad in front, pointed behind, forming a membranaceous border. Uppertentacula short, perfoliated towards the extremity According to Montagu,this species is rare on the coast of Devon. I have once observed itamongthe rocks at St Andrew's.