GEOMALACUS, 79 



GENUS IL— GEOMALACUS,'' ALLMAN. 



Body elongated, lanceolate, not keeled ; mantle shield-like, 

 oval ; respiratory orifice on the right margin of the mantle, to- 

 wards the front ; reproductive orifice behind the base of the 

 right lower tentacle ; caudal slime-gland large. 



Shell solid, suboval. 



This genus forms a connecting link between Arion 

 and Liniax, resembling the former in having a caudal 

 slime-gland, and differing from both in the position of 

 the reproductive orifice. There is only one known 

 species. 



GEOMALACUS MACULO'SUS,t AlLMAN. Pl. VI. 



Body capable of great extension, of a glossy black or brown 

 colour of various shades, elegantly spotted with yellow on the 

 mantle and upper part of the body, back covered with close-set 

 longitudinal tubercles ; ma?itle finely shagreened ; head dusky- 

 grey ; tentacles short, finely granulated, bulbs shining, eyeless ; 

 foot thick, brownish-yellow with transverse stripes, squarish in 

 front, ending in an obtusely rounded point behind ; sole yellow- 

 ish-grey, divided lengthwise by a band of a paler colour ; slime- 

 gland \2iYgt. Length, 2 inches. 



Shell oval, rather solid, with concentric lines of growth. 



This singular and very beautiful mollusc was dis- 

 covered in 1842, by Mr. Wm. Andrews, "on rocks 

 around Lough Carrough, to the south of Castlemain 

 Bay, Co. Kerry, in the west of Ireland," and described 

 by Professor Allman in a paper read by him in 1843 

 before the Dublin Natural History Society. 



It is active in its movements, and possesses the 

 power of elongating its body to a remarkable extent. 

 Dr. Gwyn Jeffreys informed me that some living 



* Earth-mollusc. f Spotted. 



