1905.] NATURAL SCIENCES OF PHILADELPHIA, 575 



tingiiishes them from E. thaanumi; otherwise they are very similar. 

 E. paucicostata (Pse.) is smaller and of a different shape. 



Melanistic and albino specimens occur with the types at Kaiwiki. 

 Mr. Thaanum has collected this species also at Olaa, Hawaii, and Hono- 

 kowai Gulch, West Maui. Under a lens in a good light some faint 

 scratches may be seen in some places, but they do not amount to spiral 

 lines. 

 Endodonta (Thaumatodon) luctifera n. sp. PI. XXXIX, figs. 4, 5, 6. 



Shell discoidal, light yellow marked wdth brown flames, whorls 5^, 

 suture moderate, s])ire rather flat, the entire last whorl a little descend- 

 ing. Apex smooth, the rest of the shell evenly costate. There are 

 about 59 costse on the last whorl with about 10 to 12 vertical intersti- 

 tial striae, but no spiral lines. The periphery is well rounded, umbilicus 

 perspective and about ^ the diameter of the shell. Ajierture lunate, 

 with 2 strong spirally entering parietal lamellae and a very short basal 

 plica or tooth. A smaller specimen has another very weak palatal 

 plica at the periphery. 



Alt. 2h, diam. 6 mm. 



vSandwich Islands. Types are in the collection of the Academy of 

 Natural Sciences, No. 58,137. 



This species differs from E. elisa; Ancey in having two parietal 

 lamellae, and it has fewer palatal folds than E. hystricella pmtcilamellata 

 Ancey. 



Explanation of Plates XXXVUI and XXXIX. 



Plate XXXVUI, Figs. 1-3. — Amastra discus n. sp. 

 Figs. 4-6. — Amastra alula (Pfr.) P. and V. 

 Figs. 7, 8. — Pterodiscus -petasus Anc. 



Plate XXXIX, Figs. 1-3. — Endodonia thaanumi n. sp. 

 Figs. 4-G. — Endodonta luctifera n. sp. 

 Figs. 7-9. — Pterodiscus loesleyi. Type specimen. 



