290 MOLLUSCA. BRANCHIFERA. Aplysia. 



*** Marginal band striated, and like hair-cloth. 



162. C. Icevis. — Valves smooth, with distinct lines of growth. 

 Mont. Test. Brit. 2. Flem. Edin. Encyc. vii. 102. Lowe, Zool. Journ. ii. 



97 On stones, not common. 



Length rarely half an inch ; breadth about a quarter, reddish, mottled 

 with white. Valves arched, slightly beaked, raised at the sides ; when highly 

 magnified, they appear minutely punctured ; border broad, striped brown and 

 white, the margin with a short fringe — A specimen found by Captain Car- 

 michael at Appin, is 1 inch and T 2 „ths in length. Montagu mentions a va- 

 riety with seven valves, which he has termed Chiton septemvalvis. 



163. C. alius. — Valves minutely punctured, the first very- 

 large. 



Linn. Syst. Nat. i. 1107- Fab. Faun. Gr. 422. Mont. Test. Brit. 4. 

 Flem. Edin. Encyc. viii. 103. — On hills, rare. 



Length fths, breadth ith of an inch, narrow, white. Valves short in pro- 

 portion to their breadth, considerably elevated in the middle, slightly beak- 

 ed ; the lines of growth distinct on the sides. Border narrow, margin near- 

 ly entire. 



**** Marginal band smooth. 



164. C. laevigatas. — Valves regularly shagreened, the lines 

 of growth distinct. 



Flem. Edin. Encyc vii. 103. — C. latus, Lowe, Zool. Journ. ii. 103. t. v. 

 f. G, 7- — Under stones, but not common. 

 Length nearly an inch, breadth about half an inch, colour rufous, mottled 

 with brown and white; the colouring of the front valve frequently disposed 

 in transverse zigzag lines, which is the case, but less distinctly, in the other 

 parts of the surface. Valves high in the middle, slightly beaked ; diagonal 

 fold elevated ; border smooth, with a nearly entire margin. — This species I 

 have found plentiful in Zetland, and on the shores of Lochbroom : Captain 

 Carmichael and Mr Lowe have likewise found it on the coast of Argyle. 



The references of the preceding species to the Tcstacea Britannica, cited 

 above, may be relied on, in consequence of interchange of specimens 

 between the late Mr Montagu and the author. 



Gen. XLI V. APLYSIA. — Tentacula four ; branchia? lateral ; 

 lid corneous. 



165. A. dep'dans. — Body of a purplish colour, with black 

 dots. 



Linn. Syst. Nat. i. 1082. Penn. Brit. Zool. iv. 42. t. xxi. f. 21 — A. hy- 

 bridal Sower. Brit. Muse. t. liii — A. depilans and mustilina, Penn. Brit. 



Zool. ii. ed. iv. 79 Not uncommon among sea-weeds a little beyond 



low water-mark. 

 Length from five to six inches and upwards ; ovate, with a produced neck ; 

 foot narrow ; head slightly emarginate, with a tentaculum on each side ; in front 

 of the superior tentacula on the neck are two black points or eyes ; branchiae 



