NOTES ON THE FAUNA OF FALMOUTH. 263 



information relating to this mollusk in any of the Fauna lists in 

 my possession, I wrote to Mr. Gr. T. Tregelles of Barnstaple, 

 who kindly furnished me with the following information : — 

 "Akera buUata (Miiller) has been found at Falmouth (Journal 

 Eoyal Institution of Cornwall, 1866), at Scilly by Lord Vernon, 

 and by my late friend, Clifford Burkill. I did not find it in 

 Mount's Bay." 



Montague*'' records the capture of this mollusk at Poole. 

 Clarke'*' writes concerning this mollusk as follows : — "Twenty 

 years ago I observed hundreds of these creatures swimming 

 and creeping on the fine mud in the lakes of the Mount 

 Pleasant Warren near Exmouth ; they, however, suddenly 

 disappeared from the locality, and not one has been seen for 

 many years." I placed the adult specimen, as soon as it 

 came into my possession, in a large glass jar filled with fresh 

 sea-water, but the mollusk must have been damaged in some 

 way, for it remained fully contracted till the evening, when I 

 preserved it for further examination. The two young specimens 

 which came from the sub-genital pits of Aurelia also remained 

 motionless. The shell of the single adult specimen measured 

 11 m.m. in length, while the shells belonging to the two 

 immature specimens measured 3 m.m. and 5 m.m, in length 

 respectively. Acera bullata is unquestionably rare at present in 

 this district. I have made a special point of hunting for 

 examples of this species since May, 1895, and up to the present 

 time have not succeeded in finding one. 



Early in September some numbers of Antiopa cristata 

 suddenly appeared on some large balks of creasoted timber 

 which had been placed under the Eastern breakwater during the 

 previous February with a view to strengthen that structure. 

 They were exceptionally large, the average length of six 

 expanded specimens being o-l cm. Two weeks later the beams, 

 which are always left dry for at least an hour during every tide, 

 were fairly sprinkled with the mollusks ; most of whom soon 

 began to deposit their delicate coils of ova. By the 20th of this 

 month they had considerably decreased in numbers, and by the 

 4th of October only one could be seen, and this was found not 

 to have deposited its ova. 



