574 PROCEEDINGS OF THE ACADEMY OF [AugUSt, 



convex, obtusely angular around the tubular umbilicus. Apertiu'e 

 oblique, much wider than high, the lip thin and simple, the cohnnellar 

 margin dilated. Alt. 3, diam. S mm. 



Kalaikoa, Oahu. Type No. 58,159, A. N. S. P., from Mr. D. D. 

 Baldwin. 



Quite vmlike the other known species in its larger aperture and 

 smaller umbilicus. It has not l)een descril)ed l)efore, Mr. Sykes's 

 name l)eing based solely upon the figure publisheil in the Manual of 

 CoiicJiolofpj. It seems rather an imecpial division of labor that we 

 should have to both figure and describe Mr. Sykes's species. 



This shell agrees well with PfeifTer's description of Helix alata; but 

 as the British Museum specimens under the name alata and those 

 in the Newcomb collection have the columella lamellate, it has been 

 held by INIr. Sykes that Pfeiffer overlooked the lamella. 

 Pterodiscus petasus Ancey. PI. XXXVIII, figs. 7, 8. 



Mr. Ancey 's figures were evidently drawn from a specimen not wholly 

 mature. Wlicn full-grown, the peristome is distinctly expanded, and 

 its margins approac-h nuich more than his figure shows. 



Waianae, Oahu. (D. I). Baldwin.) 



ENDODONTID^. 

 Endodonta (Nesophila) thaanumi n. sp. PI. XXXIX, figs, l, 2, 3. 



Shell discoidal, yellowish-white radially marked with tlark brown 

 lightning-shaped streaks. Spire composed of 5 rounded whorls, sep- 

 aratetl by a well-impressed suture. The first 4 whorls are about at the 

 same level, but the last 2 gradually descend to the aperture. The last 

 whorl is well rounded at the periphery and sculptured with 57 slightly 

 curved regularly spaced sharp ribs, the interstices of which are covered 

 with microscopical slraigJit vertical striic, about S or 10 l)etween two 

 larger ribs. The apex is smooth, but all the other whorls are costate. 

 The umbilicus is perspective, circular and about ^ the diameter of the 

 shell. The aperture is lunate, i^arietal callus thin, bluish-white, and 

 provided with two strong spirally entering lamella;. Palatal teeth or 

 plicae are absent. 



Alt. 2, diam. 5 mm. 



Kaiwiki, near Hilo, Hawaii. 



The types are in the collection of the Academy of Natural Sciences, 

 No. 89,245. They were collected by Mr. D. Thaaniim, in whose honor 

 the species is named. 



Specimens of E. hystrix (" Migh. " Pfr.) received by the Academy from 

 Dr. A. Gould have the vertical striic undulating, which at once dis- 



