DR JOHNSTO:^ OX THE CEPHALOPODA OF BERTVaCKSHIRE. 197 



clothed witli its first shell and the animal in question, tend very strongly 

 to confirm Mr Thompson's obsei'vations. It seems to me highly pro- 

 bable that, previous to the decisive change, the animal turns half 

 round in its case so as to be nearly at right angles to its former 

 position. 



The organ by -which the young animal fijses itself is the fore-foot > 

 this part, therefore, is liable to be injured in detaching it ; and this 

 may be the reason why I only saw one fore-leg, though Mr Thompson 

 gives two in his figure. 



May and June seem to be the months when the young Balani are 

 most numerous. Those who wish to observe the singular transforma- 

 tion should be on the watch at that time ; and it is certainly very 

 desirable to obtain as many and as complete observations as possible 

 on such an interesting subject of inquiry. 



A Description of the CEPHALOV OB A ivhich inhabit the coast of 

 Berwiclishire. By Dr Johnston^. 



CEPHALOPODA DIBEiVNCHIATA. 



* Head surrounded with eight nearly equal arms. 



1. Octopus. Body enclosed in a sub-globular sac, rounded at the 

 base, unfurnished with fins ; arms connected at their origins by a 

 broad membrane ; suckers sessile, toothless. 



** Head surrounded with eight arms and two long tentacula. 



2. LoLiGO. Body enclosed in an elongated cylindraceous sac, pointed 

 at the base, and winged below, separate behind from the neck ; 

 suckers pedunculate, the rim strengthened with a horny denticulated 

 ring ; dorsal plate thin and horny. 



3. Sepiola. Body enclosed in a short sac, rounded at the base, 

 furnished with rounded fins attached to the sides ; dorsal plate 

 horny, minute and very slender. 



4. Sepia. Body enclosed in an oval sac rounded at the base, furnished 

 on each side throughout its whole length with a narrow fin, and 

 strengthened dorsally with a calcareous lamellated cellular oval 

 plate, lodged in a peculiar cavity ; suckers irregularly scattered, 

 with horny toothless margins. 



1. Octopus. Lamarck. 



1 . 0. ventricosus, scentless ; body ovate, smooth or granular, profusely 

 sprinkled with reddish-brown dots ; arms straight, taper, longer 



