282 MOLLUSCA. BRANCHIFERA. Doris. 



Gen. XXXV. DORIS. — Oral, tentacula two ; vent destitute 

 of scales. 



131. D. Ar go, — Body nearly smooth ; branchial plumes 



about twelve in number. 



Linn. Syst. i. 1083. Penn. Brit. Zool. iv. 43. t. xxii. t.22 Among the 



sea-weeds and crevices of rocks near low water-mark, common. 



The usual length is about 3 inches, convex above, and rounded at each ex- 

 tremity ; of a lemon-yellow colour, slightly freckled, sometimes tinged with 

 brown. Spawn white, gelatinous and compressed. 



132. D. verrucosa. — Cloak closely covered with prominent 



tubercles ; 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 by 



storms. 



Length about an inch, of a whitish colour, more or less freckled with 

 brown. The tubercles are rough, and of different sizes, those at the base of 

 the "upper tentacula are compressed ; they are pervious at the summits. 

 Margin entire, waved. Tentacula round and smooth towards the base, com- 

 pressed and imbricated towards the summit. Branchial plumes arranged in 

 a semicircle, those at each end shortest. 



133. D. Icevis. — Cloak smootli in the middle, slightly tuber- 

 culated towards 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 milk- 

 white colour. 



134. D. marginata. — Cloak smooth, tinged with pink ; an 

 undulating membranaceous border, usually four pointed, in 

 front. 



Mont. Linn. Trans, vii. Id. t. vii. f. 7-— Coast of Devonshire. 



Length about a quarter of an inch, oval, whitish ; tentacula wrinkled ; the 

 branchial plumes are figured as 7 in number, and the head as slightly emar- 

 ginate. 



This species is certainly distinct from the D. loevis of Muller, to which 

 Montagu refers it ; though it may be no other than the D. electrina of Pen- 

 nant, whose notices, however, are too imperfect to give much weight to the 

 conjecture. 



135. D. nodosa. — Cloak with four equidistant papilla? on 

 each 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. Foot 

 broad in front, pointed behind, forming a membranaceous border. Upper 



tentacula short, perfoliated towards the extremity According to Montagu, 



this species is rare on the coast of Devon. I have once observed it among 

 the rocks at St Andrew's. 



