156 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



the number and arrangement of the tentacles ; indeed of 

 the many specimens examined at Port Erin very few had 

 quite the typical arrangement. Sars also notices this and 

 mentions one specimen with 7 pairs of gonads instead of 

 the typical 4 ; the gonads seem more regular than the 

 tentacles, but I have seen several individuals with 6 pairs, 

 one of which had 13 groups of tentacles. 



There can be, I think, little doubt that the Weymouth 

 species is identical after all with Carduella and with the 

 Lucernaria cyatJiiformis of Sars. And I may mention ^ 

 that a specimen recently found at Plymouth which has 

 been kindly lent to me for comparison, differs in no way 

 (externally) from the Port Erin form. That the latter 

 is the Lucernaria cyathiformis there can hardly be a 

 doubt, not only does it agree in external features with the 

 figures of Sars and the description of Clark, but also as to 

 its internal structure it is quite in accord with the account 

 given by the latter (with one not very important exception). 



This conclusion was at first accepted by Haeckel who 

 inserts this species in his " System der Medusen " (15, p. 

 379) as Depastrum cyathifonne, Gosse, with Lucernaria 

 cyathiformis and Carduella as synonyms ; but in an appen- 

 dix (15, p. 369) he departs from this view in consequence 

 of having himself found on the Sutherland coast a form, 

 agreeing with Allman's Carduella in having the tentacles 

 in one row only^ but which cannot be merely a young 

 Depastrum since it is sexually mature, reproducing itself 

 in that form with one row of tentacles. This, agreeing in 

 its main structural features with the species Depastrella 

 carduella discovered by himself in the Canary Islands (but 

 at first called by him Carduella depastrella), Haeckel now 

 names Depastrella allmani, giving Carduella cyathiformis 

 Allman, as a synonym, and the Orkney Islands as one of 

 its localities. Now whatever the Depastrella allmaiii 



