S8S 
MOLLUSCA. BRANCHIFERA. 
Doris. 
Gen. XXXV. DORIS. — Oral, tentacula two ; vent destitute 
of scales. 
131. D. Argo, — 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. Ixxiii. 
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 Tupper 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. IcBvis. — Cloak smooth 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. 79. 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 papillae 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. 
