A New Species of Lyropupa from Hawaii 



By C. Montague Cooke, Jr. 



Lyropupa 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 striae) 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 rapidly, 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. 1.1, 

 diam. of ap. 1.0 mm. 



Hawaii: Kohala Mts. (Thaanum). 

 Type No. 15,411, Bishop Museum Coll. 



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

 ported. In fresh specimens this species is distinctly clathratulate, 

 as are, also, L. lyrata Gld., from West Maui {nee L. lyrata (Gld.) 



[2Il] (15) 



