﻿Medusce and Ctenophores from Firth of Forth. 303 



specimens measured, the width ranges from 10 mm. to 19 

 mm. The largest has 268 tentacles, which seems to be 

 about the average number. In other cases we make out 256, 

 260, 268, 272, and 272. Among the series of tentacles there 

 are 8 sense-organs — two in each quadrant at points rather 

 nearer the adjacent canals than to each other. 



Tiaropsis miilticirrata has been recorded from Plymouth,^ 

 and Falmouth in the south, and by Mr E. T. Browne from 

 the Isle of Man, Valencia Harbour, and the Firth of Clyde - ; 

 but we have not seen any record from the east coast of 

 Britain. Sars described it from Norwegian specimens, and 

 Hartlaub, who has obtained it at Heligoland,^ quotes Metsch- 

 nikoff that its hydroid is allied to Cuspidella. 



Mitrocomella polydiademata (Romanes). 



Several examples of this medusa were obtained in Dunbar 

 Harbour on 27th June ; but, not being readily distinguished 

 in the water from small examples of the next species, we 

 cannot say whether it was present in any abundance. Width 

 of umbrella in largest specimen 8*5 mm. 



M. 'polydiademata was described by Eomanes in 1876, in 

 the Journal of the Linnean Society from specimens taken 

 in the Cromarty Firth ; and it has since been recorded by 

 Mr Browne from the Isle of Man, Bergen, and the Clyde,^ 

 but we have seen no further record from the east of Scotland. 



Eutonina socialis, Hartlaub. 



A Thaumantias-like medusa, which Mr Browne has iden- 

 tified for us as the Eutonina socialis of Hartlaub, was present 

 in abundance in Dunbar Harbour on 27th June ; and again, 

 but in less numbers, on 2nd and 11th July. On 8th August 

 all trace of them was gone. The diameter of the specimens 



1 Journ. Mar. Biol. Assoc., n.s., vol. vii,, No. 2 (1904), p. 199. 

 ^ Proc. Roy. Soc. Edin., vol. xxv. pt. ix. (1905), p. 773. 

 ^ Wissensch. Meeresuntersuchungen . . . cleutsch. Meere, etc., N. F., Bd. 1 

 1894), p. 193. 



Vol, xii. (Zool.), p. 525 ; fig. in vol. xiii., pi. xv. 

 ^ Proc. Poij. Soc. Ed., vol. xxv. pp. 767-769, 1905. 



