ACM^EA. 439 



Young specimens from deep water are very tender, and 

 have their red markings so disposed as to form monili- 

 form rays on a bluish ground, which, when the creature 

 is alive, appears even of a vivid blue colour. This is 

 the condition to which the name Lottia pulchella was 

 given. 



The animal of this pretty Limpet has attracted the 

 attention of many observers, from whose notes, published 

 and unpublished, and our personal observations, we are 

 enabled to describe it at length. It is of a yellowish 

 white colour, with the exception of the margin of the 

 mantle, which is spotted with pink at intervals, correspond- 

 ing to the rays of colour upon the shell. The mantle is 

 bordered by tentacular filaments ; these, Dr. Johnston has 

 remarked, are placed about half a line within the margin, 

 and are all directed inwards and towards the body : hence 

 the discrepancies between the figures and descriptions of 

 the animal, which has been represented and described as 

 having the margin entire. On the sides of the head are 

 the tentacula, long and subulate, swollen at their bases, 

 on the outsides of which are placed the eyes. The tongue, 

 according to Loven, differs from that of testudinalis, in 

 having the anterior margins of the square transverse 

 divisions entire and the three teeth on each square of 

 more nearly equal dimensions, and placed regularly ob- 

 liquely. The branchial plume, which has been carefully 

 examined by Mr. Alder, is coarsely pectinated, and is 

 often conspicuously exserted. The foot is oval and fleshy: 

 Mr. Clark observes that there is a slight groove on the 

 under part of its posterior extremity, and states that 

 " when the ovarium discharges the membranous bag which 

 contains the embryones, the posterior part of the foot serves 

 as its nidus until such time as the young come forth from 



