234 LAND AND FRESHWATER 
rest in a depression in the foot, the ridge of the foot runs directly 
away from the mantle-zone to the mucous pore. The right dorsal 
lobe is well developed ; the left dorsal lobe extends in one continuous 
flap round to the left posterior margin, where it ends abruptly. The 
right shell-lobe is very large, broad and triangular, covering and 
playing over a large area of the shell on the right margin of the 
periphery, but not enclosing it in any way. The left shell-lobe 
commences from near the respiratory orifice and overlaps the edge 
of the peristome; it gradually widens, and finally becomes broad 
and tongue-shaped (fig. 1 a), corresponding to the narrow left shell- 
lobe seen in VM. petrosa (vide Plate XIX. fig. 1) and to the still 
more similar reduced shell-lobe of JZ. decussata (fig. 6 of the same 
plate). The posterior portion of the foot is very long and sharply 
keeled. The pedal margin of the foot wide, with the pedal line 
strongly marked and segmented. 
Generative Organs. Are very similar to those of Macrochlamys 
(vide Plate XVII. fig. 6). The amatorial organ is present, and is 
large and swollen at the basal end; the kale-sac is longer than in 
most species. 
Spermatophore. Is long and sac-like (10°5 mm. in length), but 
the chitinous portion at the base has several recurved strong bifid 
spines, those above are straight and minute. 
Odontophore :— 
SU et TEED es Meee eo0 
AG et CAG 
Of usual form, the outermost teeth of moderate size, bicuspid. 
Jaw. Has a strong central projection. 
Description of specimen figured :—Shell depressed, ovately oblong, 
umbilicated ; sculpture quite smooth, covered with a thin epidermis, 
crossed by faint lines of growth ; colour pale olivaceous ochre ; spire 
very flat; apex subpapillate; suture shallow; whorls 43, rapidly 
increasing ; aperture elongately oval; columellar margin vertical, 
becoming suddenly very oblique. 
Size: major diam, 17°5, min. 13:0; alt. axis 5:5, body-whorl 
8:5 mm. 
AusTenta? monticora, Benson, MSS. (in coll. H. Cuming). 
(Plate LIT. fig. 2, 2 a.) 
Vitrina monticola, Pfr. P. Z.S. 1848, p. 107; Bs. MSS., Pfr. Mon. 
Hel. vol. ii. p. 497 ; Reeve, Conch. Icon. fig. 11; Hanley, Conch. Ind. 
p- 61, pl. clii. figs. 1, 4 (is H. stoliczkanus, Nevill). 
Vitrina (sec. Phenacolimagx) monticola, Pfr. Nomen. Helic. Vivent. 
LESis p27. 
Helicarion (sec. B) monticola, Theob. Supp. Cat. p. 23. 
Helicarion monticola, Pfr. Nevill, Hand-list, p. 15. 
Locality. Mussoorie (coll. G.-A.) *. 
* These specimens were shown to Captain Hutton, and named by him as 
above ; and there can be no doubt this is the species known to him and Benson 
under this title. 
