432 bullidjE. 



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, M tiller 

 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 Voluta 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. ACTION*, (Acteon) 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 : [odontophore, 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 solid, oval, spirally striated : spire pro- 

 minent and bluntly pointed : whorls rounded, and connected 

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

 but not excavated : mouth occupying 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. 



