492 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



between tide marks in Port Erin Bay, but has not been 

 found by me during- the past 16 years. 



25mm. 



Fig. 2. 



O'lmm. 



Fig. 3. 



Text-fig. 3 represents an interesting stage of the 

 development of a species other than Synapta, in which 

 the simple, digitiform tentacles are beginning to 

 protrude from the anterior end of the pupa, and the rudi- 

 ments of the circumoesophageal calcareous ring are 

 formed. This larva also was taken in July, 1908. 

 There is also in Port Erin Bay a post-larval stage, still 

 unidentified, which has been seen several times in 

 December during the past few years. 



