SUPPLEMENT. 153 



gular lines of growth : boss or nucleus indistinct, placed near 

 the front. 



HABITAT: Rocks along the shores of Lough Caragh near 

 Killarney, confined to an area of about twenty miles by six. 

 Active. Its mode of creeping is peculiar, being effected by a 

 series of movements like those of the paddles of a water-wheel 

 in a mill, which are perceptible in the slug through the trans- 

 parent band of the sole ; these movements or steps exhibited 

 at any one time are about 15 in number. It withdraws its 

 tentacles separately on each being touched. At first rejected, 

 after at least a week's fasting, some fresh turnip -tops ; after- 

 wards a little was eaten. One individual fed on some shreds 

 of raw beef, the others apparently not caring for it. When 

 handled, it rolls itself up like a leech, which it much resembles 

 in appearance. It comes out in the summer and autumn. 

 G. Andrewsi of M. Mabille is scarcely a variety. 



P. 131. LIMAX GAGATES. E. Spain (Graells) ; Malta 

 (Mamo) ; Madeira (R. T. Lowe and others). The front part 

 of the body is very broad and thick. The shield is actually 

 divided into two lobes ; the upper lobe is defined by a narrow 

 dark line, of an oval shape, and appears carved out of the 

 hinder part of the shield. This slug, like many of its conge- 

 ners, is infested by the little mite (Philodromus limacum), 

 which feeds on the exudation of the body. The shell has a 

 more square outline than that of the following species; it 

 varies in solidity according to the age of the individual. 



P. 132. L. MAEGiNATUS, Drap. (not Miiller). If it is con- 

 sidered indispensable to insist on the strict law of priority, 

 this specific name must be replaced by carinatus, and arborum 

 by marginatus. Perussac did not describe his L. Sowerbii. 

 E. Russia ( Jelski) ; Germany (Gysser, v. Strobel, and others) ; 

 Pisa (Issel). 



P. 133. L. FLAVUS. E. Sicily (Calcara) ; Madeira (Baron 

 de Paiva); U.S., in towns, "very probably introduced from 

 Europe" (Tryon); Buenos Ayres (v. Strobel). According to 

 Heynemann, the Limacus Breckwortliianus of New Zealand. 



P. 134. L. AGRESTIS. E. Greenland (Morch); Mauritius 

 (Ferussac); U.S., as L. tunicata of Gould. 



