Natural History of British Animals. 241 



anal side, from the mouth (which it partly surrounds) towards 

 the opening of the cavity, opposite the position of the anus. It 

 is about one-sixth of an inch in breadth, and has its surface 

 marked with transverse striae only. The mouth is simple. The 

 stomach and two first turns of the intestine are united together, 

 and surrounded by, the liver, which has a spongy structure. 

 Imbedded in its substance are several series of white granular 

 bodies. A large column or rib projects into the cavity of the 

 intestine, on the anal side, along the greater part of its course ; 

 its walls are coated with a dark orange-red matter, easily rubbed 

 oflF. Ovary situated between the middle of the branchial mem- 

 brane and the mass of the intestines. 



The species being rare, I could not procure a sufficient num- 

 ber of specimens to enable me to prosecute farther the examina- 

 tion of its structure ; but the details already given are sufficient 

 to indicate its more striking peculiarities, and to point it out as 

 differing, in several particulars, from the species already de- 

 scribed. 



It occurred in East Loch Tarbet, Argyleshire, adhering to 

 dead branches of some land shrub. 



Lima fragiUs, (Flem. Brit. An. 388). — I mention this rare 

 animal for the purpose of pointing out a locality where it may 

 be found in some abundance. It is near Ardbeg Point, on the 

 west side of Rothesay Bay, Bute. It seems to be an inhabitant 

 of deep water, as I found it thrown ashore only after strong 

 gales from the east. 



On Polishing' Metals. 



JjEFORE proceeding to polish metals, they commence by pre- 

 paring the surfaces they would polish ; that is to say, it is of 

 importance to remove all the marks left by the file, the turning 

 tool, the scraper, &c. in order to render the surfaces uniform. 



This preparation is effected on those metals which are not 

 very hard, by means of pumice-stone, either used in substance, 

 or reduced to powder, and water ; and, when in powder, ap- 

 plied upon felt, or upon slips of soft wood, covered with buffalo 

 or chamois skin, if the surfaces be flat ; or with pieces of soft 



