432 BULLID^. 



therium. According to Professor Loven the egg-case 

 of the present mollusk may be compared to a rope 

 twisted in different ways. I have some remarkably 

 large specimens of the shell, which the late Dr. Farran 

 procured in Connemara ; they are upwards of an inch 

 and a half in length, and nearly an inch and a quarter 

 in breadth. The flounder appears to feed on it, Miiller 

 having taken the shells from the stomach of one caught 

 in the Cattegat. 



This is probably the Bulla canaliculata of Linne ; but 

 his diagnosis being too concise, and no habitat given^ 

 there may be some doubt as to the identification. It is 

 the Valuta Jonensis of Pennant, B. voluta parva &c. of 

 Chemnitz, B. akera of Gmelin, B. Norvegica of Bru- 

 guiere, B. resiliens of Donovan, B. fragilis of Lamarck, 

 Eucampe Donovani of Leach, and B. elastica of Danilo 

 and Sandri. 



Genus IV. ACT^^ON^, {Acteo7i) De Montfort. 

 PL VIII. f. 4. 



Body fleshy, containable within the shell : head contractile, 

 squarish, depressed, and cloven in front : tentacles ear-shaped 

 or lobular : eyes placed in the middle of the head, below the 

 tentacles : foot oblong, cloven in front, but not expanding at 

 the sides : [odontopliore, rhachis none ; uncini 11, shaped like 

 long broken hooks, the largest of which form the middle row, 

 inner side resembling a rounded wing, outer side having a 

 notched crest at the bending (Loven).] 



Shell moderately soHd, oval, spirally striated : spire pro- 

 minent and bluntly pointed : luhorls rounded, and connected 

 throughout ; the first is twisted inwards : suture well marked, 

 but not excavated : mouth occuppng about two-thirds of the 

 shell in length : pillar furnished near the base with a ridge- 

 like fold, which is continued within the spire : operculum fitting 

 the irregular shape of the mouth, and altogether horny (not 



* A mythological name. 



