106 Mr. Montagu's Description of several Marine Animals 



MOLLUSCA. 



Bulla Hydatis. 



Tab. VI. Fig. 1. 



Animal not referable to any class in the Systema Naturce. 

 Test. Brit. p. 217. Vig. 1. Jig. 2. 



In the Testacea Britannica the animal is described from a dead 

 specimen ; and the figure referred to only represents the receded 

 state of the animal previous to dissolution. 



Recent opportunity of examining many of the living animals 

 of an unusually large size affords the means of correcting the 

 mistake in describing it as being destitute of eyes : and I trust a 

 figure taken from one in a lively and extended state will not be 

 unacceptable, more especially as it is of singular appearance and 

 beauty. 



When the animal is in motion, two black eyes on the top of 

 the head are visible without the aid of a glass ; these are sunk in 

 small white depressions, remote from each other, but somewhat 

 central in the shield that covers the whole anterior part: the sus- 

 tentaculum is very large, extending behind, and on the sides, 

 into broad finlike membranes that reflect, and almost conceal 

 the shell ; the two lateral ones turn under the shield at their an- 

 terior edges : the posterior membrane is divided from the others; 

 the right side of this is spread on the place where it is crawl- 

 ing, and the left side takes a turn round the posterior end of the 

 shell, and reflects over it. When the edges of the shield are 

 thrown up, and open to view the space between that and the 

 sustentaculum, on each side is observed a yellow marking in ele- 

 gant ramifications like a feather, but not apparently detached 

 as in the animal of Bulla plumula*. 



* Test. Brit. Fig. 2. Jg. a. 



The 



