474 MB. B. T. buowke on [Mar. 17, 



to any known species, as none belonging to the genus have been 

 described with medusa-buds. 



The specimens were very much ahke, but one was twice as 

 large as the other. The umbrella of largest specimen about 1 mm. 

 in diameter, globular, about as long as wide ; at the aboral end 

 there is a slight rounded swelling, formed by a mass of mesogloea. 

 The manubrium reaches nearly down to the velum ; stomach large 

 and situated upon a stout peduncle, nearly as long as the stomach ; 

 mouth round, not divided into lips. Four medusa-buds upon the 

 stomach (one bud nearly fully developed, the four tentacles visible 

 with brownish basal bulbs). On the margin of the umbrella four 

 tentacles, when fully expanded about twice the length of umbrella, 

 with blackish basal bulbs. At the free end of each tentacle a very 

 large brownish bulb containing nematoeysts. Nematocysts are also 

 scattered along the whole length of each tentacle. Cells are present 

 on the peduncle which may be nematocysts. The margin of the 

 umbrella between the tentacles is nearly straight, giving a quad- 

 rangular appearance, with a tentacle at each corner. \''elum broad. 



EuPHTSA AUBATA, Forbes. 



Euphystt aurata, Yorhss (1848) ; Haeckel (1879) ; Holt (1891); 

 Crawford (1891) ; Maas (1893) ; Browne (1895). 



Euphysa mediterranea, Ilaecltel (1879). 



Up to the present time this medusa has not been recorded from 

 many localities. It had only been found in the northern portion 

 of the British area until tliis spring, when I found it at Valencia. 

 In the ' Eeport on the Medusse of the Isle of Man ' I have given 

 a description of several specimens, and have shown that a great 

 variation in colour occurs in some specimens, and that Euphysa 

 mediterranea is only a biilliautly colom-ed form of Euphysa aurata. 



At Valencia this medusa was first taken on April 16th, 1895, 

 and after this date it was often seen in the tow-net, especially 

 towards the end of May, when it became more abundant. Most 

 of the specimens belonged to the early stages, and were much 

 smaller than any taken at Port Erin. 



The smallest specimens were about | mm. in length, and the 

 average-sized ones about 1-1^ mm. in length. 



The shape of the umbrella, of the tentacle-bulbs, and of the 

 large tentacle is similar in all the stages : thus there is no difficulty 

 in identifying the earliest forms. The smallest specimens usually 

 possess very little colour, a few are quite colourless, generally the 

 tentacle- bulbs have a pale yellowish tint, but iu a few specimens a 

 bright yellowish colour existed. 



The specimens 2-3 mm. in length possessed more colour. One 

 specimen 3 mm. in length had yellowish tentacle-bulbs, with a 

 deep orange-coloured centre. 



Many of the early naturalists described the pigmented basal 

 bulbs as ocelli. I prefer to retain the term ' ocellus ' for definite 

 eye-spots, as clearly seen in Sarsia, which also has pigmented 

 basal bulbs. 



