122 LAND AND FRESHWATER 



for the land-8hells of the locality has added largelj' to our know- 

 ledge of the island forms." 



I am much indebted to Dr. Adolf B. Meyer, Director of the Royal 

 Zoological Museum, Dresden, for the specimens now described, as 

 well as for several other interesting forms I hope to publish 

 hereafter. 



Animal with a short foot (Plate XCIX. fig. 1), noticeable in 

 Stoliczka's drawing ; the pallial margin broad, well segmented ; 

 the pallial grooves two, defining a distinct line of tubercles. The 

 foot below is not distinctly divided. The mucous gland is wide and 

 rather open, with no lengthened overhanging lobe (fig. 2), the 

 opening does not extend to the sole of the foot. 



There are no shell-lobes, the mantle-edge is turned back over 

 the periphery of the shell, with an even width throughout. At the 

 inner upper angle of the aperture (fig. 4) there is an indication of 

 a very minute shell-lobe, only to be seen with the lens *. The 

 right dorsal lobe (fig. 3) is as usual ; the left is divided into anterior 

 and posterior parts, the first large and ample, the second long and 

 narrow. 



The sculpture of the shell magnified is peculiar : the irregular, 

 undulating, transverse lines of growth are crossed by regular 

 parallel grooves, with sharply-defined sides, as if engraved with a 

 V-shaped tool. 



In the odontophore the teeth are arranged thus : — 



21 . 2 . 20 . 1 . 20 . 2 . 21 

 43 . 1 . 43 



The median teeth (fig. G) are large and broad, the central tooth 

 having only an indication of the usual side cusps, in this case shown 

 by a slight short shoulder about halfway down. In the median 

 teeth (fig. 6 a) also the outer cusp is very slightly developed, and 

 is better described as a broad sloping shoulder ; the inner margin of 

 these median teeth is straight. At the 22nd tooth the cusp is much 

 nearer to the apex, and at the 23rd the lateral teeth commence and 

 are bicuspid, with the inner point the longest ; the outermost or 

 marginal teeth (fig. 6 h) are small, blunted, and bicuspid. 



The jaw (fig. 7) is deeply concave on the cutting-edge, with no 

 indication whatever of a central projection. 



Oeaerative organs (figs. 5-5 h). In these, in proportion to the size 

 of the shell, the great length of the amatorial organ is remarkable 

 (fig. 5), being 55 mm. long, as compared with that of Hemiplecta 

 humplireijsiana. Lea, which is 40 mm., and Hemiplecta'? foweri, 

 E. Smith (Proc. Malacol. Soc. of London, vol. iii. no. 5, p. 284), of 

 Perak, which is 75 mm. 



The spermatheca is small and rather short, pear-shaped on a 

 stalk. The male organ (figs. 5 a, 5 h) consists of a short sheath 

 encircled by a muscular band, and with this band is tied in a smaU 

 globose s^c, representing the kalk-sac or flagelluip ; indication was 



* Compare this with fig. 1 a, Plate XCVIII. 



