238 LYROPUPA. 



length, than L. lyrata and more cylindrical in outline,* 

 the apical whorls are granulose-wrinkled, the rest of the whorls, 

 strongly sculptured, the last with about 15 hardly flexuous 

 eostffi. Lower palatal fold very short. 



Length 2.8, diam. 1.47, apert. 1.0 mm.; whorls 5*/ (type). 



Length 2.6, diam. 1.55 mm. 



Oahu: Very abundant in pleistocene deposits, Manoa, 

 (Thaanum, Cooke) ; "Waimanalu (single specimen, Cooke). 

 Type 11039 Bishop Museum ; paratypes 45279 Bishop Museum 

 and 119462 A. N. S. P. 



The external features are about as in uncifera, but the 

 lower palatal fold is somewhat more reduced than in any 

 other form. 



2. LYROPUPA MICROTHAUMA Ancey. PL 21, figs. 2, 3. 



" Shell smaller than the preceding [mirabUis] and less 

 cylindrical, hence more conoidal-oblong ; whorls 5, with the 

 upper margin extended less outwardly, angular lamella more 

 elongate and distinct, the upper palatal elongate, almost 

 abruptly truncate near the external margin, the lower more 

 elongate, scarcely drop-shaped, not at all parallel to the pre- 

 ceding, but diverging gradually forward. Length 1.8, diam, 

 1, apert. 0.66 mm." (Ancey). 



Oahu: Nuuanu, type loc. (Thaanum) ; numerous localities 

 in the Koolau range from Keawaawa to Kaipapau (Spalding, 

 Gouveia, Bridwell, Cooke) ; Waianae range, Pukaloa (Spald- 

 ing, Cooke). Holotype 18750 Bishop Museum and paratypes 

 18751 Bishop Museum and Thaanum Coll. 



Lyropupa microthauma ANCEY, Proc. Malac. Soc., London, 

 vi, 1904, p. 126, pi. vii, f. 20. 



L. microthauma is somewhat intermediate between the group 

 of L. lyrata and that of L. mirabilis. The embryonic whorls 

 are minutely spirally striate, a character found in most of the 

 species of the first named group. The angular lamella is 

 shorter than in the other species of this group but higher 

 and more developed than in any species of the second group. 

 The columellar lamella is very deeply, almost axially seated. 

 It is rather strong and viewed from above slightly semilunate- 



