468 AEIONIP^. 



SLUGS. 



It has been found convenient to deal with the land slugs 



collectively. For tlieir systematic position reference should be 



made to the systematic index at the commencement of this 

 volume. 



Family ARIONIU^E. 



Subfamily ARIONIN^. 



Genus ANADENUS, He>/nemann. 



Anademis, Hevuemann, Malak. Blatt. x, 1863, p. 138 ; Godwin- 

 Austen, Moll. India, i, 1882, p. 46. 



Original description (in German) : — " Anadenus (without tail 

 gland). Body fused with the sole for the whole length. Mantle 

 covering the anterior part of the body. Eespiratory orifice placed 

 behind the middle of the right side of the mantle. Genital orifice 

 behind the right upper tentacle. Two upper and two lower 

 retractile tentacles. Back flatly convex (without keel, without 

 tail-o-land). Sole tripartite. .Taw with close transverse ribbing. 

 The curve of the transverse ro\\s of the radula practically in a 

 plane. Tooth-plates rectangular with projecting sides. Central 

 tooth unilateral, triangular with lateral spines. Laterals scarcely 

 differing froni central, with a lateral spine on the outer side. 

 Internal shell present, white, calcareous, ^\'ithout epidermis on 

 the margin. Nucleus lateral. 



" The animal superficially resembles our German Arions and 

 Li maces. It is related to Arion, but only resembles Limax. Its 

 relationship with Arion is established by the jaw \\hich has 

 transverse ribs as in Arion emjnricorum. On the other hand 

 it differs in the following particulars : — 



Arion. Anadenus. 



Caudal gland : present. absent. 



Ptespiratory oritice : in front of placed further back. 



middle of the mantle. 



Internal shell : absent. present, with distinct growth- 



(the mantle contains only lines. 



scattered calcareous particles). 



" The principal character in which Anademis differs from Arion 

 is the absence of the caudal gland ; somewhat less weight must 



