730 ' EDWARD T. BROWNE. 



Willia furcata, Haeckel (1879, p. 158). There is no figure published of this species, but 

 the description shows that, if it is not identical with Willia stellata, it comes very close to it. 

 Distribution. North Atlantic ; France (Haeckel). 



Order LEPTOMEDUSAE. 



Family Eucopidae, Gegenbaur, 1856. 



Genus Phialidiuni, Leuckart, 1856. 



Generic Character. Eucopidae with many marginal sensory vesicles ; one or more between 

 every two tentacles, each having a single otolith. Many tentacles. No marginal cirri. A gonad 

 on each of the four radial canals. Stomach not on a peduncle. 



Phiulidmm tenue, species nova. (PI. LIV. fig. 4, PI. LVII. fig. 16.) 



Description. Umbrella watch-glass-shaped and thin. Stomach small, quadrangular in 

 shape, and situated on a semi-globular thickening of the umbrella. Mouth with four lips 

 and a sinuous margin. Four gonads extending over the outer half of each radial canal. 

 Tentacles 25 in number. One or two minute marginal bulbs between every two tentacles. 

 Sense organs numerous, one or two (rarely three) between every two tentacles, with a single 

 otolith. 



Size. Diameter of the umbrella 15 mm. 



Distribution. Indian Ocean; Maldive Islands, Miladumadulu (Gardiner). 



There is only one specimen in the collection. The semi-globular thickening of the umbrella 

 upon which the stomach is situated cannot be regarded as a true peduncle ; it is simply 

 a thickening of the wall of the umbrella. The tentacles are thin and slender with transverse 

 rows of nematocysts. Their basal bulbs are a little broader than long; one measured 

 045 mm. in width, 033 mm. in length. The specimen closely resembles Phialidiuni tempo- 

 rarium, Browne, one of the commonest medusae in the British seas. It differs in the shape 

 and size of the basal bulbs of the tentacles, being broader and about twice the size. The 

 umbrella is a little thicker and the semi-glubular mass of jelly at the top of the sub-umbrella 

 cavity is verj' much larger. In Phialidium temporarium this thickening is often absent and 

 never very conspicuous. 



Genus Pseudoclytia, Mayer, 1900. 



Generic Character. Eucopidae with manj' marginal sensory vesicles ; one or more 

 between every two tentacles, each having a single otolith. No marginal cirri. Five radial 

 canals, each with a single gonad. Stomach not on a peduncle. 



Mayer established the genus Pseudoclytia for a new species (P. pentata), which he found 

 in great abundance at the Tortugas, off Florida, U.S.A. This species is pentamerous, possessing 

 five radial canals, five gonads, and a mouth with five lips. Among 1000 individuals Mayer 

 found 70"3 p.c. to be pentamerous with radial canals at equal distances apart. Hitherto among 

 the Eucopidae four radial canals wei-e always regarded as the normal number and any 



