LYROPUPA. 239 



in outline. The abrupt termination of the upper palatal fold 

 at the lip, and its slight enlargement there, are special features 

 of the species. The lower palatal fold is shorter and stouter 

 than the upper, and penetrates more deeply. In a few speci- 

 mens the last whorl is distinctly closely and minutely striate 

 spirally, but in most specimens the minute spiral striae are 

 visible only on the ribs and have entirely disappeared from 

 the interstices. 



Specimens from the type locality have from 19 to 21 rather 

 strong slightly oblique ribs on the last whorl. Those from 

 Kaipapau have 23 to 24. 



In a Kaipapau shell opened the lower palatal fold is some- 

 what longer than in the Nuuanu preparation figured, and is 

 curved, the concavity towards the base, the inner end being a 

 little stronger. 



Length 1.96, diam. 1.04, apert. 0.65 mm. ; 6 whorls (type loc., 

 head of Nuuanu Valley). 



Length 1.9, diam. 1.04, apert. 0.64 mm.; 5% whorls 

 (Kaipapau). 



Length 1.92, diam. 1.1, apert. 0.65 mm.; 5% whorls 

 (Pukaloa, Waianae Range). 



This species has never been found abundantly in any local- 

 ity. It is usually taken in loose, damp talus more or less 

 covered with dead leaves. It is probably distributed over the 

 whole length of the Koolau Mts., as it has been found by a 

 number of collectors in rather widely separated colonies. In 

 the Waianae Mts. it has only been taken, on two occasions, 

 from one of the little valleys. 



3. LYROPUPA RHABDOTA C. & P., n. sp. PL 20, fig. 2. 



The shell is sinistral, rirnate-perforate, subcylindrical, with 

 slightly convex and tapering outlines, brussels brown, except 

 for a rather broad lighter zone at the middle of the last 

 whorl, hardly translucent, dull. Sculpture of strong, slightly 

 oblique ribs, 12 to 14 on the last whorl, the interstices and 

 ribs spirally striate with minute, close, raised threads. Spire 

 tapering above to a slightly conical, obtuse summit. The in- 

 dividual whorls very convex and separated by a deep suture. 



