THE NAUTILUS. 17 



17. Lagochilus ciliferus Mousson. 



The typical form (Javan) is somewhat carinated, but this does 

 not seem to be a persistent character. These bear scarcely a trace 

 of carination. 



18. Leptopoma vitreum Less. 

 Slightly heavier than typical. 



19. Crossopoma enganoense n. s. PI. 2, figs. 1, 2, 3. 



Shell much depressed. Whorls 5, well rounded. Sutures 

 channeled, the channel being partially covered by succeeding whorl 

 below. Aperture oblique, scarcely descending, round. Peristome 

 double, the outer border expanding above into a sutural fold, 

 slightly descending and sinuate, reflected below. Inner peristome 

 deeply notched above, elsewhere continuous and almost exactly 

 round. Umbilicus wide, showing all the whorls. Growth lines 

 prominent. Sometimes a series of heavy cord-like spiral lines on 

 last whorl. Light yellowish-brown above, mottled with irregular 

 patches of dark chestnut; a white band at periphery ; a dark chest- 

 nut band below this of more or less solid color ; base light chestnut 

 with a wide, white (denuded) band within the umbilicus. Operculum 

 horny 4. nearly flat, multispiral, edges slightly raised and bevelled, 

 nucleus central, slightly concave below. 



Alt. 15, greater diam. 30, lesser diam. 24 mm. 



The color pattern is somewhat variable, though following in gen- 

 eral that of the type. In many specimens the sutural canal is en- 

 tirely covered. It bears a strong superficial resemblance to Crosso~ 

 poma planorbulum Lam. (Sumatra), but differs in being higher, 

 more deeply umbilicated, and in the notched inner peristome. It 

 differs also from Pterocyclus sluiteri Btg. (Java), in its higher spire, 

 less oblique aperture, less developed wing on outer peristome and 

 more pronounced notch upon the inner peristome as well as in the 

 general color pattern. The operculum of this shell is rather that of 

 Cyclophorus than of Pterocyclus, but its shell characters are essen- 

 tially of the latter. It is a third species of von Marten's genus 

 Crossopoma, based upon the crenate or toothed edges of the outer 

 lamella of the operculum. 



20. Helicina ? 



I am unable to refer this to any known species. 



21. Truncatella ceylonica Pfr. 



A widely distributed shell. 



