486 MB. B. T. BBOWNE ON [Mar. 17, 



Between every bulb and tentacle six to ten cirri, very small and 

 colourless. Scattered on the ex-umbrella, just above tbe margin, 

 are numerous cirri, such as Forbes described. 



Eight adradial marginal vesicles, with about twelve otohths in 

 each. The gonads are ui)on the four radial canals, extending from 

 the stomach nearly to the margin of the umbrella. The basal 

 bulbs of the tentacles and tiie large bulbs without tentacles are 

 ahke in colour ; a yellow centre nearly surrounded by a purplish 

 band. 



I sent to Mr. E. J. Allen, at Plymouth, a description of these 

 medusae taken at Valencia, and asked him to collect specimens for 

 me. He kindly sent me seven specimens, alive, and some more in 

 formaline, on June 28th. They were similar to the specimens 

 taken at Valencia. The marginal vesicles contained a few more 

 otoliths, arranged in some specimens in two rows. The stomach, 

 mouth, and gonads purplish in colour. The tentacle-bulbs were 

 coloured exactly like those of the Valencia specimens. There were 

 cirri upon the ex-umbrella near the margin, and also between the 

 tentacles. Diameter of the umbrella 10 to 15 mm. 



During a visit to Plymouth, in 1893, I saw some specimens 

 of a medusa, labelled Laodice criiciuia, taken by Mr. Garstang. 

 Some of these specimens are now in my collection. They show 

 the cirri on the ex-umbrella near the margin, and agree in other 

 details with the description given by Forbes. The marginal 

 vesicles are not to be seen, as the specimens are in alcohol. I 

 have proved over and over again that the marginal vesicles 

 often shrivel up in spirit-specimens. Therefore, the absence of 

 vesicles in spirit-specimens does not prove their absence in living 

 specimens. 



During a visit to Plymouth in September, 1895, I found in the 

 tow-net a very yoiuig medusa, which I believe, from the coloration 

 of the tenlacle-bulbs, may possibly be the earliest free-swimming ' 

 stage of Euchilota 'pilosella. (i'l. XVI. figs. 7 & 7a.) 



Umbrella bell-shaped, about 1 mm. in length and width. Eight 

 marginal vesicles, with a single otolith in seven of them and two 

 otoliths in the other one (the number of otoliths increases with 

 age). Two opposite perradial tentacles, very short, and two 

 opposite perradial bulbs, without tentacles. The basal bulbs of 

 the tentacles are alike in coloration, a yellowish centre with a 

 purplish band ; the bulbs without tentacles colourless. 



The mouth has four lips, and the stomach extends into the 

 substance of the umbrella, terminating in an apical stalk, which 

 shows that the medusa has not long been liberated either from 

 another medusa or from a hydroid colony, in this case probably 

 from the latter. I placed this medusa in an aquarium ; nine days 

 later the apical stalk had disappeared, but the tentacles remained 

 in same condition. 



I think there should be no difficulty in identifying Euchilota 

 pilosella. The cirri upon the ex-umbrella near the margin and 

 the eight marginal vesicles distinguish it from apy other species, 



