152 TEANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



(the 4 camerse of Clark). Lucernaria (as now restricted) 

 and Haliclystus belong to this snb-family. 



Between the pubHcation of Clark's Prodromns (12) in 

 1863, and of Haeckel's ''System der Medusen," 1879 (15) 

 there had been found a number of species closely allied to 

 the already known Lucernarians but having the stalk in a 

 rudimentary condition, and thus forming a link with the 

 ordinary free-swimming medusae. For these Haeckel 

 founded the family Tesseridse, which with the family Lu- 

 cernaridse constitute his order Stauromedusse, the latter 

 family coinciding with Clark's Lucernaridse, except that 

 DejKistrum is removed from it and placed among the 

 Tesseridse on account of its supposed relationship to De- 

 ixtstrella, a species of the Tesseridse discovered by him- 

 self in the Canary Islands, which unlike the rest of the 

 sub-family has a well developed stalk for attachment. 

 Now although Depastrum has some points in common 

 with Depastrella, yet in internal structure it differs very 

 materially, and I prefer to follow Clark in retaining it 

 among the Lucernaridse. 



Sub-family — Cleistocaepid^. 



Depastrum cijatliiforme, (Sars.) 



This species was discovered last year by myself and Mi. 

 Gamble on the S. side of Port Erin Bay. I found it again 

 during the recent vacation in the same locality, and also 

 on the limestone rocks at Poyllvaaish. It is fairly abund- 

 ant in both localities, attached to the under surface of 

 stones, being apparently most plentiful above the Lamin- 

 arian zone, though occurring in that zone also more 

 sparingly, but according to my experience of larger size. 

 It is very firmly attached, and I doubt whether it ever 

 moves from the spot where it first attaches itself; I 

 have never seen a detached specimen re-attach itself, in- 



