EAST INDIAN NESOPUP/E. 337 



Key to Vertigmiixr of the East Indies. 



Angular and parietal lamella? diverging forward, the for- 

 mer connecting with the outer lip. 



b\ Angular lamella small and low; 5 or 6 teeth. 



N. malayana, no. 39. 



& 2 . Angular lamella strongly developed ; 5 to 10 teeth. 

 c 1 . Shell cylindric-oblong, palatals readily visible. 

 d\ Irregularly striate with largely cutic- 

 ular riblets at intervals, often fuga- 

 cious; frequently minutely pitted. 

 e l . Without interpalatal folds. 



/'. Length 1.8 to 2.15 mm. 



N. mareleti, no. 36. 

 f 2 . Length 1.5 mm. 



N. moellendorffiana, no. 37. 

 e~. With 1 or 2 interpalatal folds, 7 

 to 10 teeth in all; Guam. 



N. quadrasi, no. 32. 



d~. Having fine, close rib-striag without 



cuticular edges; length 1.4 to 1.6 mm.; 



Philippine Islands. N. nannodes, no. 38. 



c 2 . Shell globose-ovate ; palatals, except the upper, 



deeply immersed ; 1.36 x 1.12 to 1.45 x 1.1 mm. 



N. moluccana, no. 35. 



Angular lamella short, remote from the upper termina- 

 tion of the outer lip. 



b l . Diam. less than half the length; 2.25x0.9 mm..; 

 Christmas Island. N. proscripta, no. 41. 



6 2 . Diam. more than half the length ; 2 x 1.2 mm. 



N. selebensis, no. 40. 



No angular lamella; parietal and columellar lamellae pres- 

 ent ( Costigo ) . 



fe 1 . One or two palatal folds; striate, with spaced hair- 

 like riblets; Moluccas. Costigo saparuana, p. 366. 

 &-'. No palatal folds ; no cuticular riblets ; Busuanga. 



Costigo calamamea, p. 367. 



