958 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 Carduwella and with the 
Lucernaria cyathiformis 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 cyathiforme, Gosse, with Lucernaria 
cyathiformis and Carduella as synonyms; but in an appen- 
dix (15, p. 869) 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 allmant 
