494 MB, B. T, BnowNB ON [Mar; 17i 



bulbs, without tentacles, one of the bulbs has a short cirrus ; and 

 also four interradial and eight adradial bulbs, without cirri. Eight 

 marginal vesicles, with a single otolith, situated close to the 

 perradial canals, 



This medusa is clearly a very early stage, not long libei-ated 

 from a hydroid. The presence of cirri tends to show tliat it may 

 develop into a medusa like Saplienia, or may bud two more ten- 

 tacles and become like Eutima. As it resembles Saphenia in its 

 present condition, I have placed it here until the hydroid form 

 is identified. 



At the end of May 1895 I found two specimens in Valencia 

 Harbour, The smaller 4 mm. in diameter. As this medusa has 

 been so little described, I give tlie characteristic points of the 

 largest specimen (PI. XVII. fig. 3) : — Umbrella 9 mm. in width and 

 5 mm. in length. Manubrium about 10 mm. long. The two 

 opposite, perradial tentacles about 15 mm. in length, when fully 

 expanded ; twelve to fi.fteen marginal bulbs in each quadrant 

 of the umbrella ; the tentacles and all the bulbs with cirri. 

 Eight marginal vesicles with 3-5 otoliths. The medusa is com- 

 pletely colourless, except for a delicate pinkish tinge on the stomach 

 and lips. 



DiSTUiBUTiON. Scotland — Firth of Forth, Wriyht. 



England — Plymouth, Gunniwjham; Bles ; Oarstang; E.T.B. 

 Isle of Man, Browne. 



Ireland — Valencia Island, E. T. B. 



OoTOECHis GEGENBAUKi, Haeckel. 



OctorcMs (jegenhauri, Haeckel (1864) (1879). 



A single specimen of this medusa was taken, for the first time 

 in British Seas, at Plymouth on 7th September, 1895. Only two 

 species — 0. gegeiibauri and 0, campanulatus — are known and are 

 only recorded from the Mediterranean. The Plymouth OctorcMs 

 does not correspond exactly to the descriptions given by Haeckel 

 of either the above species, but appears to be an intermediate 

 form, a kind of connecting link between the two species. As it is 

 more lilce 0. gegenbauri, I have placed it under that name, 

 , Umbrella bell-shaped, 6 mm. in length and 9 mm, in width. 

 Manubrium when fully expanded 12 mm, long. Peduncle quad- 

 rangular, about five times as long as the stomach ; mouth witii 

 four large, crenate lips. Eight tentacles (4 perradial and 4 inter- 

 radial), about 10 mm, long when expanded, about 2 mm. long when 

 contracted, without cirri at the base. About 60 bulbs, or warts, 

 iBVeuly distributed on the margin of the umbrella, nearly every 

 one with short spiral cirrus. Eight marginal vesicles, adradial, 

 with 6 to 10 otoliths in two rows. On each of the four radial 

 canals, about the middle of the peduncle, there is an oval mass of 

 ova, and also a genital band, probably containing spermatozoa, 

 extending along the radial canals from the base of the peduncle 

 nearly to the margin of the umbrella. Medusa perfectly 

 polovirless, ., ; . , 



