728 GASTROPODA. [Pulmonata. 



Hob. North Island : Otaki Gorge, type (H. B. Preston) ; Ormond- 

 ville (Chad wick) ; Forty-mile Bush (H. S.). 



Remarks. Nearly allied to E. corniculum and E. Bianca, but at 

 once distinguished from both by the excessively fine and dense riblets. 



32. Endodorita segregata, Suter, 1894. Plate 28, figs. 18, a, b. 



Charopa segregata, Sut., P.L.S. N.S.W. (2), viii, 496, pi. 23, f. 10, a, b. Endo- 

 donta (Charopa) segregata, Suter, J. de Conch., xli, 271. 



Shell small, discoidal. umbilicated, not shining, rather distantly 

 radially ribbed, thin, semitransparent. Sculpture of the post-nuclear 

 whorls consisting of almost straight subequidistant sharp radial 

 riblets, 4 per millimetre ; all the whorls are microscopically finely 

 spirally striate ; the interstices between the riblets with fine growth- 

 lines, decussated by the spirals. Colour horny, with distant irregular 

 light-brown radiate streaks. Spire but little elevated, flattish. Proto- 

 conch of 1| shining and convex volutions. Whorls 4, slowly and 

 regularly increasing, convex, periphery and base rounded. Suture, 

 deep. Aperture slightly oblique, rotundly lunate. Peristome simple, 

 acute, straight, regularly curved. Columella short, vertical, arcuate. 

 Inner lip very slightly expanded, not callous, extending as a thin 

 shining layer over the parietal wall. Umbilicus moderately wide, 

 conical, about one-third of the diameter. 



Diameter Maj., 2-75 mm. ; min.. 2-5 mm. : height, l'25mm. 



Animal unknown. 



Type in my collection. 



Hob. North Island : Waimarama ; found amongst a lot of other 

 shells from flood-margin of a stream (A. Hamilton). 



5. Group of Endodonta biconcava. 



Shell discoidal, spire concave or infundibular. Protoconch radi 

 ately striate, smooth or spirally lirate. 



KEY TO SPECIES. 



A. Protoconch radiately striate. Riblets 10 per millimetre ; 



interstices without spiral striation ; spire moderately con- 

 cave ; whorls 5 ; dimensions, 5 mm. by 2 mm. . . . . biconcava. 



B. Protoconch spirally lirate. Riblets 19 per millimetre ; inter- 



stices without spiral striae ; spire infundibular, sunk to one- 

 third of height ; whorls 5 ; dimensions, 1-6 mm. by mm. vortex. 



C. Protoconch smooth. 



1. Riblets 7-9 per millimetre ; interstices with indistinct 



spiral lines ; spire concave, sunk to one-quarter of 



height ; whorls 4 ; dimensions, 4 mm. by 2 mm. . . Moussoni. 



2. Riblets 15 per millimetre ; interstices reticulated ; spire 



deeply concave ; whorls 4 ; dimensions, 2-7 mm. by 



H mm. . . . . . . . . . . Huttoni. 



3. Riblets 20 per millimetre ; interstices with very tine dense 



spiral striae ; whorls 5 ; dimensions, 1-9 mm. by 



1-1 mm. .. .. .. .. microrhina. 



4. Riblets 30 per miDimetre ; interstices without spirals ; 



spire infundibular, deep ; whorls 5 ; dimensions, 



1 : , ; mm. by 0-8 mm. . . . . . . . subantialba. 



