312 HAWAIIAN NESOPUPAE. 



ally. It is more deeply seated than the outward termination 

 of the lower palatal fold, and has a low lamella-like form. 

 The lower palatal fold is always present; it is deeply seated 

 and generally much stronger than the upper palatal. The 

 interpalatal fold is usually low, lamelliform, and more deeply 

 seated than either the upper or lower palatals. Like the 

 lower, the upper palatal fold was present in every specimen 

 examined. The suprapalatal fold, when present, is nodular 

 in form and is ordinarily seated about half way between 

 the termination of the upper palatal fold and the inner margin 

 of the peristome. 



The outline of the shell varies from narrowly conic-ovate 

 to broadly ovate. There are from 4 to 4% whorls in adult 

 specimens. 



The number of costag on the last whorl varies from about 

 15 to nearly 30. In each of the different colonies the number 

 of costas is nearly uniform. 



Typical specimens of newcombi from Oahu are slightly 

 larger than those examined from Hawaii. Otherwise they 

 agree fairly closely. A specimen from Palolo has about 17 

 costas on the last whorl. It measures: length 1.75, diam. 1.1 

 apert. (diag.) 0.73 mm., 4i/ 2 whorls. Another specimen from 

 Tantalus measures: length 1.83, diam. 1.2, apert. (diag.) 0.70 

 mm., 4% whorls. In all the specimens from the latter locality 

 there are from 25 to 28 costae on the last whorl. Lanai speci- 

 mens are somewhat smaller than those from Hawaii. They 

 have about 20 costae on the last whorl. The outline of the 

 shell is globosely-ovate. An adult specimen with 4% whorls 

 measures: length 1.53, diam. 1.1, apert. (diag.) 0.67 mm. 

 Molokai specimens are very similar to those from Oahu. An 

 adult shell with 414 whorls measures: length 1.72 diam. 1.05 

 apert. (diag.) 0.73 mm. 



When typically developed the minor races can be deter- 

 mined by the following key. 



a 1 . Columellar lamella straight or slightly upturned within. 

 fe 1 . Angular lamella a short lamella or tubercle only. 

 c 1 . Form rather broadly ovate-conic. 



