EMARGINULA. 261 



Mr. M f Andrew noticed that it decreased in size), at 

 various depths between 1 and 80 f. 



Curious old Petiver called this shell the " cracked 

 Barnstaple Limpet/' in consequence of Lister having 

 figured it as found in that place. According to De 

 Gerville it bears the name of " Tentaille " in the north 

 of France. The inside is sometimes greenish or rose- 

 colour, being probably stained by algse or nullipores. 



The first locality given by Linne for Patella fissura 

 is England, on Lister's authority ; his description an- 

 swers to the present species, as well as to E. rosea. It 

 is the E. reticulata of J. Sowerby, who however does 

 not say that it is distinct from E. fissura, but gave 

 it a new name because of the then prevalent opinion 

 that no fossil was the same as any recent species : his 

 reflection on the subject is somewhat hazy, though 

 pious. It is also the E. conica of Sars (but not of 

 Schumacher), E. Miilleri of Forbes, E. leevis and E. 

 fissurata of Recluz, whose E. tenuis appears to be the 

 young. 



2. E. ro'sea*, Bell. 



E. rosea, Bell, in Zool. Journ. i. p. 52, pi. 4. f. 1 ; F. & H. ii. p. 479, 

 pi. lxiii. f. 3. 



Body white : mantle not projecting beyond the shell, and 

 having a scalloped margin ; it is notched in front to form the 

 tubular fold, which is bordered on each side by an angulated 

 prominent lobe : tentacles of moderate length, and stout : eyes 

 rather large, placed on distinct, although short, pedicles or 

 stalks : foot large, strong, and very steep-sided. At its junc- 

 tion with the rest of the body is a circle of about 20 very 

 short papillary cirri (F. & H.). 



Shell smaller and much narrower than E. fissura, and 

 otherwise distinguishable in the following particulars : — it is 

 proportionally broader in front than behind, and pinched up 



* Rosecoloured. 



