66 LEPTACHATINA, GROUP N. 



Molokai: Kamalo (Thaanum), near Waikolu (Cooke). 



L. lanceolata is most nearly related to L. baldwini, from 

 West Maui. It differs in its more attenuate form, narrower 

 aperture, etc. 



86. L. IMPRESSA Sykes. PI. 6, fig. 18. 



"The shell is imperforate, dextral, oblong, pellucid, shin- 

 ing, pale corneous, striate; spire elongate, apex obtuse; 

 suture impressed; whorls 7 1 /2, slightly convex, the last equal 

 to one-half the length of the shell; aperture sinuately pyri- 

 form; lip simple, thin, dextral margin erect, arcuate, colu- 

 mellar margin narrow, adnate, parietal margin lacking. 

 Length 7.0, diam. 2.5 mm." (Sykes.) 



Lanai (Thaanum): mountains behind Koele (Perkins). 



Leptachatina impressa SYKES, Proc. Malac. Soc. London, 

 ii, 1896, p. 127 ; Fauna Haw., ii, p. 364, pi. xi, fig. 8. 



A small elongate species related to L. lanceolata from 

 Molokai and to L. baldwini from Maui, but slightly more 

 costate than either of these two species. 



The species is well represented in Mr. Thaanum 's collec- 

 tion. In fresh specimens, the shells are a unicolorous light 

 brown to rather dark shade of brown ; a few specimens have 

 a broad dark brown band' just above the periphery. PI. 6, 

 fig. 18 is a copy of the original figure. 



87. L. SUPRACOSTATA Sykes. PI. 6, fig. 19. 



"Shell elongate, turrited, imperforate, dextral, thin, corn- 

 eous, polished ; whorls 8, the last equal to % the length of the 

 shell, the first subcostulate- near the sutures, the rest almost 

 smooth; suture impressed, marginate, marked with a spiral 

 line; aperture lunate, columella subarcuate; dextral margin 

 slightly thickened, columellar margin subreflexed, furnished 

 with a very small, obliquely twisted fold. Length 6.3, diam. 

 2.0 mm." (Sykes.) 



Lanai: mountains behind Koele (Perkins). 



Leptachatina supracostata SYKES, Fauna Hawaiiensis, ii, 

 p. 370, pi. xi, fig. 22. 



"Only two specimens. It belongs to the group of L. exilis 



