272 LYROPUPA. 



In L. thaumasm the diameter of the shell is about 58 to 

 65 per cent of the length ; in L. cubana it is about 70 per cent. 



The specimens from Bkaula (4) and Olokele (1) are slightly 

 larger than the typical form, more globose in outline, with 

 considerably weaker palatal plicae and with shallower and less 

 distinct sulci on the last whorl. Fossil specimens from Lima- 

 huli agree very closely with the typical form. 



Pease distributed this species as his Vertigo costata -, but 

 the description of that shell does not apply well to this. 



Undetermined species. 



"VERTIGO COSTATA Pse. Shell cylindrical, oblong, some- 

 what solid, dextral, rimate-perforate, longitudinally flexuously 

 strongly cost ate, reddish; whorls 4, rotundate-convex, the last 

 strongly concentrically bisulcate, compressed at the base, apex 

 obtuse ; suture strongly impressed ; aperture bell-shaped, 

 rotund at the base, furnished with 4 lamellae, 2 on the parietal 

 wall, the first united with the lip, the second median, entering, 

 1 on the basal margin, 1 on the lip posteriorly; inner lip 

 flexuous ; peristome thin, with the margins not joined. Length 

 2.0, diam. 1.0 mm. Hawaii." (Pease.) 



Vertigo costata PEASE, Proc. Zool. Soc. London, 1871, p. 461. 

 Pupa costata PPR., Monographia Hel. Viv., viii, p. 399. 

 BOETTGER, in von Martens, Conchologische Mittheilungen, i, 

 1880, p. 59. ANCEY, Mem. Soc. Zool. France, 1892, v, p. 710. 



This species could not be found in the Pease collection at 

 Cambridge, and the junior author, in the course of many years' 

 collecting has never seen a specimen meeting all the require- 

 ments of the description, which gives characters both of 

 Nesopupa and Lyropupa ; the 4 whorls and disjoined margins 

 of the aperture would place it in Nesopupa, but the deep 

 suture, strong, flexuous costse and the position of the upper 

 palatal fold on the outer lip show that costata has certain 

 claims to be ranked as a Lyropupa. 



Specimens sent by Pease as costata to the Academy of 

 Natural Sciences and others sent to A. D. Brown (now in the 

 museum of the Academy) are Lyropupa ihaumasia; but this 

 species is far broader than Pease's measurements indicate, the 



