154 SUPPLEMENT. 



P. 128. — A. hortensis. E. Lapland (Nylander, as A.fas- 

 ciatus); U.S. (Binney and others). 



P. 129. — Geomalactjs, Allman. It is not keeled on the 

 back ; I was misled by Forbes and Hanley's description. 



P. 129. — G. mactjlostts. Through the kindness of Dr. 

 Battersby, I have had an opportunity of examining several 

 living specimens of this remarkable slug, which I will now 

 describe. 



Body very extensile, glossy, brown of various shades from 

 dark to olive (occasionally of a whitish colour with black spots), 

 beautifully but irregularly marked on the upper part with 

 numerous spots of pale yellow or sometimes white, the whole 

 surface being covered with extremely minute black and white 

 specks, as if powdered over or of a "pepper-and-salt" mixture ; 

 the back is wrinkled lengthwise by close-set rows of oblong 

 tubercles : shield finely granulated, like seal-skin : head dark 

 grey : tentacles short ; upper pair conical at the base, minutely 

 granular; bulbs lustrous, truncated at the tips; lower pair 

 very small and button- shaped ; both pairs are retractile or 

 reversible and equally sensitive to touch ; but neither of them 

 seems to apprehend the presence of external objects, however 

 closely placed, if not in actual contact : eyes, none that I could 

 detect, although I carefully examined several individuals by 

 the aid of a Coddington as well as an ordinary magnifying- 

 glass ; at first indeed I thought there were eyes, placed on the 

 upper part of the tentacular bulbs ; but this appearance was 

 an optical illusion, caused by the convergence of the solar rays 

 through the lens on that part of the bulb, and the same ap- 

 pearance shifted to other parts (1868, Oct. 4. Reexamined 

 for eyes, but could not find any) : respiratory orifice large, 

 circular, placed on the right-hand side of the animal about 

 halfway between the front of the shield and that part of it 

 where it bends inwards to the rear: foot thick and large, 

 brownish-yellow, and striped across at the sides, which some- 

 what project or shelve outwards ; it is squarish in front, and 

 rounded or bluntly pointed behind ; sole pale yellowish or 

 light grey, and having for its entire length a rather broad and 

 clear band which runs down the middle : caudal gland large : 

 slime gelatinous, whitish. L. 2. B. 0-4. 



Shell resembling that of a Limax, but of a granular struc- 

 ture, oval or shield-shaped, rather solid, slightly convex above 

 and equally concave underneath, showing concentric and irre- 



