474 ARIONID^. 



of the pulmonary sac being shown in the figure. The retractor 

 muscles of the eye-tentacles, odontophore, and penis are all 

 situated in a line close together at the posterior margin of the 

 mantle ; and in this they are thus somewhat more like Avion, only 

 that the muscle of the buccal mass has a more posterior position 

 for its attachment." (Godwin-Austen.) 



Hah. India : Tandiaui (TJieohald) ; Changligali, near Murree, 

 Kashmir {Stoliczlca) ; Simla {Godivin-Atisten) ; Nepal {Nevill). 



Lieut.- Col. Godwin Austen originally considered Anaclemts 

 (/iganteiis, Heynemann, the same as Theobald's altivagus, the 

 description as regards texture of the epidermis of the mantle 

 and foot agreeing well, although he admitted that specimens of 

 the former (contracted in spirit) measured from 80 to 100 mm. 

 in length, while the shell was 20 mm. long and 12 mm. broad. 

 Theobald also inclined to this view, but Nevill was of opinion that 

 wliat he considered r/if/anteits, of which he had seen specimens from 

 Nepal, was a larger and distinct species*. 



Grodwin- Austen, however, subsequently appears to have modified 

 his opinion, for in the copy of his ' Land and Preshwater Mollusca 

 of India,' at the Natural History Museum, is a note in pencil, from 

 his hand, on page 48 as follows: — pi. vi, fig. 1 " Simla. This sp. 

 is not r/iganteus. A sp. of true cjigantens has been received from 

 Ivadmandu." 



The Nepal specimens referred to by Nevill as gir/anteus, 

 on the other hand, Godwin-Austen named iasignis as recorded 

 under A. jerdoni. 



4G4. Anademis giganteus, Hegnemnnn. 



Anadenus yiyanieus, Heynemann, Malak. Blatt. x, 1863, p. 140, 

 pi. 1, figs. 1 a-\ f (dentition), fig. 1 // (interior shell), fig. 1 h 

 (part of bacli) ; Godwin-Austen, MoU. India, i, 1882, p. 48; 

 Tryou, Man. Conch, ser. 2, i, 188-5, pi. 59, fig. (5.3 (shell). 



Anademes {Altiva(/u.^) yigantcus, Cockerel], The Conchologist. ii, 

 1893, p. 192. 



Original description (in German) : — " Length of contracted 

 animal 80 to 100 mm. Length of the mantle iiO to 40 mm. 



" Colour isabelline, brownish. 



" Internal shell 20 mm. long, 12 mm. wide, flat, very thick. 



" Jaw w ith about fourteen ribs, more or less distinct from each 

 other in front. The terminal ribs are fused. 



" Eadula : 110 transverse rows. Central tooth slender, long- 

 necked, with a long point and indication of side cusps. Laterals 

 scarcely different, inclining towards the middle, with still longer 

 points and similar indications of side cusps. Tlie less developed 

 teeth towards the margin have much longer points but no side 

 cusps. 



" The upright position of the points, especially noticeable in the 

 laterals, is also characteristic of Avion. 



* Sci. Res. Secund Yiirkaud Mission. Mollusca, 1S78, p. 21. 



