LYROPUPA. 223 



LYROPUPA (Vol. XXV, p. 226). 



(By H. A. Pilsbryj and C. Montague Cooke.) 



Renewed search iu the Museum of Comparative Zoology by- 

 one of us (C. M. C.) brought to light Pease's type lots of 

 Vertigo striatula and T r . costata, which at the time we dis- 

 cussed Lyropupa had been reported as lost. 



Lyropupa striatula (Pease). PL 28, figs. 1, 2. 



See Manual, xxv, p. 246, for original description. A co- 

 type from 45234 M.C.Z. here figured is cylindroid-tapering, 

 widest at the last whorl, dull chestnut-brown with a pale 

 peripheral band, strongly ribbed, about 5 ribs in 1 mm. on 

 face of the last whorl. Surface but slightly shining, showing 

 weak, fine raised spiral strise between the ribs; on the last 

 whorl above the sulcus about 14 of these striae may be counted. 

 The whorls are very strongly convex, the last half-whorl 

 tapering downward, having a spiral median impression run- 

 ning to the lip, and on the back a deeper short impression 

 running obliquely downward and forward from it. Angular 

 lamella thin and high. Parietal well developed. Columellar 

 deeply immersed. Upper-palatal fold emerging, entering 

 deeply. A low, wider, lower-palatal somewhat diverging for- 

 ward from the upper, is visible in the throat. Length 2.45, 

 diam. 1.4 mm. ; 5y 2 whorls. 



Hawaii: Kalapana, Puna (Pease). 



This species stands very close to L. clathratula (Anc), dif- 

 fering by the deeper furrows on the back of the last whorl 

 and the more numerous spiral threads. These are also weaker, 

 but since they are largely cuticular in L. clathratula, their 

 weakness in this cotype of L. striatula may be due to wear. 

 For the present we allow both to stand as species. 



Lyropupa costata (Pease). PL 28, figs. 6, 7, 8. 



The original description has been reproduced in Vol. XXV, 

 p. 272. 



The cylindric shell is strongly ribbed after the smooth 1% 

 earliest whorls, the ribs narrow, somewhat flexuous, in the 



