90 LAND AND FRESHWATER 



3 cZ), and presents well-marked differences. In external character 

 there is much diversity in the shell- and dorsal lobes. 



Subgenus Eurychlamts, nov. 



The two species which will now be described in full possess so 

 many striking characters not found hitherto in other Indian species 

 that I have felt it necessary to create a new subgenus under the 

 above title (indicated in Presidential Address, Proc. Malacol. Soc. of 

 London, vol. iii. no. 5, p. 250, read 10th February, 1899). 



Descrijitioii of the Sub(jenus. 



The shell-lobes are elongate and broad, more or less papillate, 

 enveloping the shell. The left dorsal is divided into two lobes, 

 the posterior one nari'ow. Lobe above mucous gland overhanging. 

 Foot long and narrow behind, the sole with central and marginal 

 areas. In the genitalia the male organ is a simple straight sheath, 

 the retractor muscle attached at the end, and above a small bulbous 

 enlargement where the vas deferens joins. The amatorial organ is 

 absent. The jaw has a central projection. The central tooth is 

 tricuspid, the median teeth bicuspid, the laterals evenly bicuspid 

 .(from 70 to 60 on each side). 



In a species, planoxpira, inhabiting Sikkim are found all the 

 above characters, with the exception of possessing the amatorial 

 organ ; and it is thus apparently nearer to this subgenus than to 

 Austenia, in which it was first placed by me, principally on shell- 

 characters and the ample shell-lobes. 



EuRTCHLAMys PLATroHLAMYs, W. T. Blanford. (Plate LXXXIV. 

 figs, 1-1 e.) 



Macrochlamys? platychlamys, W. T. Blanford, Journ. A. S. B. 

 vol. xlix. pt. 2, 1880, p. 195, pi. ii. fig. 9. 



Nanina (sec. Macrochlamys) platychlamys, Tryon, Man. Conch. 

 2nd ser. vol. ii. p. 91, figs. 70, 71. 



Original description [Plate LXXXIV. fig. 1 /;] :— " Testa perfo- 

 raf/i, conoideo-depressa, pertenuis, nitida, leevigata, sub lente obsolete 

 striatida, fulvo-cornea. S2nra parum elevata, apice obtuso, suturd 

 levi aliquando marginatd. Anfr. 5, vta.' convexiuscidi, regulariter 

 accrescentes ; idtimus non descendens, perijiherid rotundatus, siditus 

 convexus. Apertura obliqua, lunaris, latior qnavi alta. Peristoma 

 temie, simplex, leviter sinnatum, marginibus remotis, callo tenuissimo 

 jimctis, columellari brevissime verticali, peranguste rejlexo. 



" Diam. maj. 11, min. 9^, axis 5^ mill. 



" Animal pallio maximo indutum, duos lobos latos lingucformes 

 emittente, qui spiram testae omnino circumtegunt. 



" 11 ab. Bombay. 



" Shell perforate, conoidly depressed, very thin, smooth, and 

 polished, obsoletely striated beneath the lens, fulvous-horny in 



