STACEA. 27 



work docs not profess a scrupulous adherence to the particular 

 point of arrangement. It i- r.ither d. -voted to i he discussion of habits, at 

 least it is so in a groat measure, than to minute descriptions of the forma- 

 tion of ports. While the latter has been attended to by other*, the 

 former has been irreatly overlooked and neglected. 



At the same time, a general correspondence in the form of all the 

 animals brought t-iiMher in sect ions, is carefully observed here: then 



none which are thus approximated can be in fact very remote. 



ANCTU-- 1 1. rv i ATI us Plate VI. 



The habits of this animal bear great similarity to those of the li 

 *o common on the rocks and stones of the sea-shore ; but it is an inhabi- 

 tant of the fresh-waters. 



Probably its name, Am-ylns, originates in the presumed resemblance 

 of the shell to a particular kind of .shield known among the ancients. It 

 seems to have been first given by Geoffrey, and afterwards recogniml or 

 adopted by Mn . II -; .;i.i \ ermium, vol. ii. p. 199. 



i!i of the shell three or four lines ; height above two ; form of 

 the circumference a broad oval. The apex, slightly curved, is situate 

 nearer to the posterior than to the anterior extremity. Colour tending 

 to olive ; apex brown. Animal a Limax, or approaching that genus, ;' 

 about the same Im^th as the shell ; body broad, head large and distinct, 

 with the mouth conspicuous below ; tentocula two, with a very black 

 at the internal root of each ; colour slate-grey. 



This creature is endowed with considerable activity. The sole, in 

 wlin^r, extends somewhat beyond the margin of the shell ; and in 

 passing over an angular substance, the body, relieved from the sides of it, 

 then seems attached exdu-ively by that portion of the llesh forming tin- 

 art. 



Tli-.- animal : iheconfervoid aquatic plant- vegetal ii)L r on stony 



MII faces : also on wood. . branches, and on other substance*. 



