122 HISTORY OF BRITISH ZOOPHYTES. 
it sent to me from the neighbourhood of Kirkcudbright, by 
Mr. E. B. Fleming; and soon after I dredged it in Arran, 
and found it also on our shore at Saltcoats. It is more 
slender and graceful than H. halecinum, and has little of 
the regular herring-bone appearance. ‘The vesicles also are 
different in form, resembling the flower of a calceolaria, or 
rather a woollen slipper without any leather on the sole. 
When young, the colour of the polypidom is white; 
when old, it is brownish. The vesicles contain four em- 
bryos, which, when mature, make their escape through the 
orifice, and traverse the vessel in which they are kept, with 
their swelling head foremost. In this state they are called 
Planaria by Sir J. G. Dalyell. The vigour of their motion 
gradually relaxes till they become quite quiescent, and a 
stem rising from above indicates a nascent Haleciwm. Only 
six days is required to bring them to this degree of maturity, 
computing from the discharge of the planule from the 
vesicle. 
The specific name given to it by Dr. Johnston is in 
honour of the indefatigable Mr. Bean, of Scarborough, by 
whom it was discovered. An excellent figure of it may be 
found in Dr. Johnston’s admirable work, plate xi. 1, 2. 
3. Hazrectum muricatum, David Skene. (PlatelI1.fig. 9.) 
