GYLIAUCHEN. 211 



e. Pale-colored; only one infrapari- 

 etal lamella. Ava. 



G. bensonianus, no. 1. 

 e 1 . Dark brown. Tonkin. 



G. crossei, no. 5. 



a 1 . Sculpture of spiral threads or strise; space between the 

 two palatal plicae nearly flat, not excavated. 



6. Last whorl excavated or concave below the periph- 

 ery ; umbilicus wide ; spiral striation rather coarse. 

 c. Very broadly umbilicate. Kalao. 



G. everetti, no. 7. 

 c 1 . Moderately umbilicate. Tenimber I. 



G. dohertyi, no. 8. 



6 1 . Last whorl flattened but not excavated below the 

 periphery; umbilicus narrow; spiral striation fine 

 and close. Java. G. fruhstorferi, no. 6. 



Series of G. crossei. 



Periphery having a rounded keel, a concavity above it; 

 surface minutely granulose; a concavity between the palatal 

 plica3. 



1. GYLIAUCHEN BENSONIANUS (Blanford). PI. 37, figs. 11, 12. 

 Shell moderately umbilicated, turbinate, not distinctly stri- 

 ated, thin, horny. Spire conical, apex papillar and with the 

 axis oblique, suture deep. Whorls 4, the upper ones flattened, 

 the last bulging below the suture, and again at the periphery 

 (where it bears a prominent rounded keel), rounded beneath, 

 and compressed towards the umbilicus. It rises somewhat 

 towards the mouth, which is round, nearly vertical, slightly 

 turned upwards, free from the other whorls, and furnished 

 inside with five lamellar teeth, four of which are equidistant 

 and opposite to each other at the upper and lower corners of 

 the mouth, so as to form a partial St. Andrew's cross, while 

 the fifth, which is smaller, is close to and above that at the 

 upper corner of the parietal margin. Peristome free, simple, 

 broadly expanded and trumpet-shaped. Major diam. 3, minor 

 2.2, alt. 2 mm.; diam. of peristome 1 mm. (Blanford). 



