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 

 Planarite 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 Halecium. Only 

 six days is required to bring them to this degree of maturity, 

 computing from the discharge of the planula? 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 . HALECIUM MURICATUM, David Skene. (Plate III. fig. 9 . ) 



