on the Coast of* Scotland. '295 
Bell Bock on the following morning, a considerable swell from 
the SE. prevailed. Having landed on the Bell Rock, and spent 
some time in surveying the arrangements of the light-house, a 
minute account of the details of which may shortly be expected 
from the pen of the able engineer by whom they were framed, 
a few minutes only could be spared for the pursuits of natural 
history on the rock itself. This last, in a mineralogical point of 
view, presents nothing of interest. It is a portion of the great 
bed of old red sandstone , of which the rocky promontory called 
the Redhead, on the neighbouring coast of Angus, consists ; the 
characters of which I have given in considerable detail, in the 
second volume of the Memoirs of the Wernerian Natural His- 
tory Society. 
In the numerous pools of water left by the retiring tide, the Ap- 
lysia depilans , an animal celebrated in the annals of superstition, 
occurs in great abundance. The Doris argo 9 Eolida papillosa , 
and Coryna glandulosa , were likewise common. These four 
species, I may add, are plentifully distributed in the Isle of 
May. The Tuhularia penicillus of Muller (Zool. Dan. lxxxix. 
Fig. 1. 2.), was likewise observed. 
The bottom and sides of almost all the pools were densely 
clothed with the Fucus lycopodioides of Turner, Historia Fu- 
corum, p. 24. tab. xii. It was here growing directly upon the 
rocks ; and not, as in many other places, parasitic on the stems 
of the larger fuci. This plant is the favourite residence of the 
smaller marine animals. A few tufts which were pulled up, yielded 
us the Helix margarita , and Turbo striatus of Montagu, in great 
abundance ; together with Oniscus marinus of Pennant (Ido- 
tea entomon var. of Latreille), and Idotea pelagica of Leach, 
(probably the Oniscus marinus of Linnaeus). Besides these, the 
two following species of less frequent occurrence presented them- 
selves. 
i. Cyclops chelifer of Muller’s Entomostraca, p. 114. 
Tab. xix. Fig. 1. 3. This species differs so much from the 
Cyclops quadricornis , the well known type of the genus, as to 
render the institution of a new category necessary for its recep- 
tion, which may be termed Dactylops. It agrees, indeed, with 
the genus Calanus of Dr Leach (Supplement to the Encyclo- 
paedia Britannica, article Annulosa), represented by the Cyclops 
