A New Species of Lyropupa from Hawaii 



By C. Montague Cooke, Jr. 



I^yropupa truncata, n. sp. 



The shell is rimate, sinistral, cylindrical, dark brown, cla- 

 thratulate, with about 14 well developed lamelliform costae on the 

 last whorl (between the costae 5-8 minute striee) and with 3-4 

 raised spiral striae on each whorl. Spire cylindrical, apex almost 

 flat, giving the shell a truncate appearance. 

 Suture simple, depressed. Whorls 5, the 

 embryonic without transverse costae but 

 with numerous minute close spiral striae, 

 increasing rather rapidl}', the rest convex, 

 clathratulate, increasing slowly, the last 

 slightly narrower than the penultimate, 

 with two distinct longitudinal depressions 

 corresponding to the palatal plicae. Aper- 

 ture perpendicular, quadrate ovate, with 

 7 folds, viz.: three parietal lamellae, — the 

 angle lamella slightly arcuate, extending 

 nearly to the margin of the peristome, the 

 parietal a little deeper situated, strongly 

 developed, and a minute dentiform infraparietal lamella ; a deeply 

 situated but well developed columella lamella ; three nearly 

 parallel palatal plicae, — the lower palatal extending nearly to 

 the peristome, the upper palatal more deeply situated and a 

 very short deeply situated basal plica. Peristome continuous, 

 slightly expanded. Length 2.6, diam. 1.66, length of ap. i.i, 

 diam. of ap. i.o mm. 



Hawaii: Kohala Mts. (Thaanum). 

 Type No. 15,411, Bishop Museum Coll. 



This is one of the most distinct species of Lyropitpa so far re- 

 ported. In fresh specimens this species is distinctly clathratulate, 

 as are, also, L. lyj-ata Old., from West Maui {iiec L. lyraia (Gld.) 



[211] fi5) 



