504 RADIATA. ACALEPHA. Pleurobrachia. 



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 Rev. Charles Cordiner of Banff, in his " Remarkable 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, Bast. Op. i. 124, t. xiv. f. 6 — B. pileus, Fab. Fauna Groen. 361. 

 Scoresby, 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 with the same animal, sent me in 

 1819 an outline drawing of its form. I have since been informed by my 

 friend John Graham Dalyell, Esq. advocate, that it occurs in the Frith of 

 Forth. 



