on the Coast of Scotland. 801 
distinguish it from the latter, while the absence of the sharp 
dorsal ridge on the middle of the upper mandible, immediately 
above the nostrils, indicate it to be different from the former. 
By means of a grapple, some fuci, with adhering animals, 
were procured from the bottom of the bay. The Millepora 
polymorpha appeared in such abundance, as to warrant the con- 
clusion, that it might be advantageously employed for the pur- 
poses of agriculture and building, especially as limestone in 
Orkney is scarce, and generally of bad quality, some of it con- 
taining 20, and even 30 per cent, of impurities. 
One example of the Asterias nigra of Muller (Zoologia Da- 
11 ica, tab. xciii. f. 1, 2, 3.), was procured, making another addi- 
tion to the British Asteriadae from the Northern Seas. 
The following animals of the Linnean genus Ascidia likewise 
occurred : — 1. Clavelina (Savigny) lepadiformis , (Zool. Dan. 
tab. lxxix., f. 5.). This was first recorded as British, in conse- 
quence of specimens being sent by Dr Leach to M. Savigny, 
and noticed in the 66 Memoires sur les Ascidies” (Paris, 1816), 
p. 237. 2. Ciona intestinalis , the Ascidia corrugata of Muller 
(Zool. Dan. lxxix., f. 3, 4.), which I had observed many years 
before as a common Zetlandic production. 3. Pandocia con- 
chilega , (Zool. Dan. tab. xxxiv., f. 4, 5, 6.). It was, as usual, 
much infested with the Modiolus discors. 
The Botryllus Schlosseri was likewise abundant, covering the 
roots and stems of the larger fuci, and, like the preceding, in- 
closing numerous specimens of the Modiolus discors. 
Not a few examples of the Aplysia depilans were brought up, 
and along with these a solitary specimen of the A. punctata of 
Cuvier. It was a young one, not exceeding an inch in length. 
On the Devonshire coast, as I have been informed by Montagu, 
it is found so large “ as to fill a moderate sized tea-cup.” The 
white spots, by which this kind is characterised (for the condi- 
tion of the branchial lid is the same as in A. depilans), are far 
from sufficient to justify its claim to rank as a distinct species, 
especially as the common kind is subject to considerable variation 
of colour. It is singular, however, that, while numerous ex- 
amples of the latter have occurred to us on different parts of the 
coast, this is the first time we have met with the one having 
white spots. 
