378 



PROCEEDINGS OF THE ACADEMY OF 



[Nov., 



L. ruhricinda Migh. 



L. Candida Pse. 



L. (?) marmorea 'Pse' Sowb. 



L. costata Pse. 



Only the first two can be considered well known. 



Leptothyra verruca manti, n. subsp., differs from the typical form 

 by the black (on the beach fading to brown or olive-brown) color 

 of the tesselation, or it may be black with whitish spots, and the 

 smaller size, altitude 4, diameter 3.8 mm. It is from Diamond 

 Head, Oahu, Haena, Kauai and other places, often abundant. 



/^'~T?^!I>s 



X 



Fig. 12. — Leptothyra Candida 

 percostata. 



Fig. 13. — L. viaria. Fig. 14. — L halnearii. 



Leptothyra Candida percostata (fig. 12) is a small, thick, white, 

 narrowly mnbilicate shell, with sculpture of 7 spiral ribs, the first 

 radially plicate, the rest smooth, below them a broad, radially plicate 

 border about the mnbilicus. The aperture is rounded, oblique. 

 Columella arcuate, narrow next to the umbilicus, very broad and 

 fiat at the base. Length 2.3, diameter 2.5 mm. It differs from 

 L. Candida as defined by Pease by the solidity and coarse ribs. 

 Has been taken at Haleiwa and Honolulu (Pilsbry) and Hilo (Thaa- 

 num). 



There are sometimes interstitial threads between the ribs. 



Leptothyra balnearii n. sp. Fig. 14 



The shell is perforate, solid and thick, red tessellated with white 

 (or entirely red), the first whorl white. Sculpture of smooth spiral 

 cords, of which four in the flattened peripheral region are large ; above 

 them there is a small cord and a flattened, radially plicate sub- 

 sutural band; below there are four small cords and a strongly pli- 

 cate band around the umbilicus. Aperture oblique. Columella 



