XXI. 



AT several parts of the Scottish coast, and especially 

 at North Berwick, may be found specimens of that 

 curious gasteropod named the Aplysia, or Sea-Hare, 

 the Lepus marinus of the ancients. 



On visiting North Berwick during summer, I have 

 been astonished to discover, in almost every pool, 

 from two to twenty of these creatures. 



At rest, the Aplysia is not by any means inviting, 

 but when in motion, elevating and depressing the 

 fleshy mantle that covers over the fringed and lobed 

 branchiae, its appearance is exceedingly graceful. 



Striding across a pool on the look-out for some 

 Gobies, whose forms darting beneath a large stone 

 had not escaped my glance, I perceived the water in 

 the rocky basin gradually lose its crystal brightness, 

 and become changed to crimson. The Gobies were 

 therefore allowed to rest in peace, while I proceeded 

 to investigate a phenomenon that, at the moment, 

 seemed somewhat singular. 



A kind friend and brother zoologist, who happened 



