774 Proceedings of Royal Society of Edinburgh. [sess. 
the mouth has four small lips. The gonads have not yet begun to 
develop. Twenty-four tentacles. As the basal bulbs of the 
perradial tentacles are much larger than the others, it is probable 
that the medusa on leaving its hydroid has four tentacles. The 
basal bulbs of the interradial tentacles are next in size. Eight 
adradial marginal sense-organs (the otoliths are not visible ; 
specimens in formalin), and at the base of each sense-organ, 
adjacent to the circular canal, there is a large, roundish, black 
ocellus. 
Description of the largest specimen, about 1 *5 mm. in length 
and 2*5 mm. in width : — The umbrella is bowl-shaped and has 
moderately thick walls. The stomach is short and flat, and the 
mouth has four small lips. The gonads are just beginning to 
appear along the central part of the four radial canals. The 
tentacles, about seventy, are closely packed together round the 
margin of the umbrella. The basal bulbs of the tentacles are 
spherical in shape, with a thick pad of nematocysts on the inner 
side. The tentacles are small and slender, covered with transverse 
circular bands of nematocysts. Eight adradial marginal sense- 
organs, each with a black ocellus at its base. 
SCYPHGMEDUSiE. 
Lucernaria quadricornis, 0. F. Muller, 1776. 
Lucernaria fasicularis , Johnston, 1847, p. 244, and p. 252, pi. 
xlv. figs. 3-6. 
Found by Joshua Alder at Ardrossan in 1846. (See Johnston, 
1847, p. 252.) 
Depastrum cyathiforme (Sars), 1846. 
Lucernaria cyathiformis, Sars, 1846, p. 26, taf. iii. figs. 8-13. 
Lucernaria cyathiformis , Johnston, 1847, p. 475, fig. 86. 
Carduella cyathiformis , Allman, 1860, p. 125, pi. v. 
Depastrum cyathiforme , Russell, 1904, p. 62, pi. v. 
Depastrum was found by Landsborough in the south of Arran 
(see Johnston, 1847), and by Russell in the same locality in 1903. 
The latter also found it at Little Cumbrae and near Keppel pier. 
