470 CCELENTERATA. 
2. Panceri, P. Gli organi luminosi e la luce del Beroidei. 
Rendic. Acc. Nap. viii. 1872 j abstracted in Ann. Sc. Nat. 
(5) xvi. 8, pp. 59-67. 
The seat of the luminosity is a yellowish substance contained in micro- 
scopical vesicles surrounding the eight vascular trunks of the costm, some- 
times also continued along their ramifications {B. rufescens) or prolongations 
{Cesium). In most of its qualities it resembles the luminous substance dis- 
covered by the same observer in Phyllii'hoej Pennatula, and Pyrosama. All- 
man’s observations on the influence of solar light upon the luminosity of 
Beroids are conflrmed and extended. 
On the substance {Noctihicim) to which all luminosity in dead and living 
organisms appears to be due, cf. 0. R. Ixxv. p. 647. 
On the Ctcnophora of the Canaries, cf. GreeflTs ^ Madeira/ p. 32, 
