PTYCHAL&A. 225 



Lyropupa ovatlua moomomiensis Pils. & Cooke, n. subsp. 

 PL 28, figs. 3, 4, 5. 



The last two whorls of the oblong shell are about equal in 

 diameter. The last whorl tapers downwards and in its last 

 half has a deep spiral furrow in the position of the upper- 

 palatal fold ; below it a much shorter furrow at the basal fold. 

 The base is narrowly rounded, costate. The angular lamella 

 and upper-palatal fold emerge to the peristome; parietal 

 lamella is low. Columellar deeply immersed but visible as a 

 broad vertical plate in an oblique view in the mouth. The 

 strong lower-palatal fold and a lower basal fold are visible 

 deep within in a somewhat oblique view, fig. 5. Length 2.2, 

 diam. above aperture 1.2 mm.; 5y 2 whorls. 



Molokai: Pleistocene or later, Moomomi. Type 44762 

 ANSP. 



Lyropupa ovatula kona, Moomomi specimen, P. & C, Man. 

 Conch., XXV, p. 267, pi. 26, f. 5. 



The type of this species, formerly referred by us to the 

 Hawaiian subspecies L. ovatula kona, was somewhat obscured 

 by hard material. On removal of this it became evident 

 that our decision was erroneous. The form is most nearly 

 related to L. ovatula of Oahu, differing by the smaller pari- 

 etal lamella and details of the last whorl and base, as shown 

 in the figures now given. 



Genus PTYCHAL^A Boettger. 



Vol. XXV, pp. 157, 220, 273. The type species, P. flexidcns 

 (Reuss), of the Lower Miocene (Burdigalian) of Tuchorschitz 

 is figured (pi. 29, fig. 8) from a specimen supplied by W. 

 Wenz. The species flexidens and capellinii, with their sub- 

 species, from the Lower Miocene to the Upper Pliocene, be- 

 long here. In the recent fauna, the Bonin Island P. dedecora 

 (Vol. XXV, p. 158) is the only known species of exactly this 

 type. It appears to me that though the shell is otherwise 

 wholly Vertigo-like, the strong angular lamella well connected 

 with the peristome differentiates the group sufficiently from 

 Vertigo. It stands between Vertigo and Nesopupa, having the 



