504 RADIATA. ACALEPHA. Pleuiiobrachia, 
by Professor Mitchill as arteries, in a luminous Beroe, which I suspect was no 
other than the species I am now giving an account of. When the Beroe fulgens 
swam gently near the surface of the water, its whole body became occasionally 
illuminated in a slight degree ; during its contraction, a stronger light issued 
from the ribs ; and when a sudden shock was communicated to the water, in 
which several of these animals were placed, a vivid flash was thrown out. 
If the body were broken, the fragments continued luminous for some se- 
conds, and, being rubbed on the hand, left a light like that of phosphorus. 
This, however, as well as every other mode of emitting light, ceased after 
the death of the animal.” Mr Macartney observed this species in Hearne 
Bay, on the northern coast of Kent, in October 1804. None were to be; 
found in the same place in the month of September in the following year, al- 
though some Medusae occurred which had been the companions of the Beroe 
in the preceding season. 
There is a third animal, nearly related to the genus Beroe^ which is figured 
by the late Bev. Charles Cordiner of Banff, in his “ llemarkable Ruins,” 
No. xi. Patella, fig. g G. The magnified representation which he has given, 
appears to intimate a subcylindrical animal, open at both ends, with a raised disc 
near one of the extremities, surrounded with diverging spines, and exhibiting 
two spots, whence probably issue tentacula. The author has failed in this, 
as in many other instances, to give descriptions in illustration of the designs 
of his pencil. 
Gen. XXVI. PLEUROBRACHIA.— Body suborbicular, 
with eight ciliated ribs and two ciliated arms, one on each 
side. 
67. P. pileus , — The lateral arms equal. 
Beroe, Bctst. Op. i. 124, t. xiv. f. 6. — B. pileus. Fab. Fauna Groen. 361. 
Scoresbg, Arctic Reg. i. 549, t. xvi. f. 4. — In the British seas, rare. 
The late George Montagu, Esq. in a letter to me, dated 22d November 
1812, says, “ I have lately added Beroe pileus to the British Fauna.” My 
friend Dr Leach, who subsequently met Avith the same animal, sent me in 
1819 an outline drawing of its form. I have since been informed by my 
friend John Graham Daly ell. Esq. advocate, that it occurs in the Frith of 
Forth. 
