Or SOME COMMON MARINE ANIMALS. 



251 



Balanus, and there are 230-4 square quarter inches in a square foot, 

 one square toot of -rock at Fleshwick Bay, near Port Erin, 2940 

 were counted (fig. 2). 



jjf .-■■ S 



■ ' • ■'■. ^, - . -'■ 



- ' ' ~-'" ft \. ;&,4 



X--& 7" ■ ^ "■* 



,- / '■ -' ' ™ ; *■>' ^ 



T*- '•■ ' ■ ■ ■ • 



But on 



barnacles 









' 



use .'W?iR'!V ; 



Fig. 2. — Balanus balanoides on rocks at Port Erin, uat. size. 



Fig. 3; — Part of a mussel bed at Morecambe Bay. 



Balanus must be of value as a food-matter, not only directly if crunched 

 up or sucked out of its calcareous covering, but also indirectly through its 

 free-swimming larvae. In early spring it sets these free in the Nauplius 

 stage in such abundance that the water close to the barnacle zone, or in any 

 shore-pools of the neighbourhood, looks muddy, and when dipped out in a 

 glass jar, is seen to be crowded with dense swarms of the minute lame. 



