708 GASTROPODA. [Pulmonata. 



riblets, strongly flexuous on the periphery, about 5 to 8 per milli- 

 metre ; the interstices with fine microscopic growth-lines ; there is 

 no spiral sculpture. Colour fuscous with a greenish hue, either with 

 distant irregular radiate brown streaks extending in zigzag lines to 

 the umbilicus, or without any markings. Epidermis thin, horny, dull. 

 Spire mostly flat, rarely a little raised. Protoconch of 1 J whorls, quite 

 smooth, flat, horn-colour. Whorls 5, rather flattened, especially the 

 first four, slowly and regularly increasing, periphery subangled ; 

 base convex. Suture impressed. Aperture lunate, subtriangular, ob- 

 lique. Peristome simple, sharp, retracting below. Columella short, 

 oblique, arcuate. Inner lip slightly thickened and expanded, forming 

 a thin whitish and polished layer on the parietal wall. Umbilicus 

 broad, conical, perspective, about two-fifths of the greatest dia- 

 meter. 



Diameter Maj., 5J mm. ; min., 5 mm. : height, 2-5 mm. 



Animal small, yellowish - white. Eye - peduncles rather large, 

 clavate, blackish, a narrow black stripe extending along the neck 

 to the mantle. Tentacles short, rather stout, rounded in front. The 

 neck is transversely grooved. The whole length of the foot is bor- 

 dered by a distinct pedal line, and to it run over the whole length 

 of the body diagonal grooves. Mantle rather posterior ; tail short, 

 rounded, tapering, without mucous pore, and not extending beyond 

 the shell. Sole uniformly whitish, smooth. 



Jaw very thin, membranaceous ; the upper margin arcuate, the 

 cutting-edge indistinct, almost straight. 



Radula tongue-shaped, the transverse straight rows consisting 

 of 16+1+16 teeth, of which 4-5 may be considered as laterals. 

 Central tooth quadrangular, longer than broad, sinuated anteriorly, 

 reflection tricuspid, the median long and reaching with its short 

 cutting-point to the posterior end of the base ; the side reflections 

 are short, rounded, each with a rudimentary cutting-point. Laterals 

 broader, almost quadrate, similar to the central tooth, but the mesial 

 cutting-point is extending beyond the base over the next row of teeth. 

 A few intermediate teeth show a shortening of the median reflection, 

 its cutting-point is becoming stouter and longer, and the entocone is 

 also increasing in size. Marginals short and very wide, first with 

 3 then with 4 teeth, the two inner ones long and stout, the outer ones 

 remaining small. Last marginal minute, quadrate, bidentate. 



Type in my collection. 



Hab. North Island : Poverty Bay (A. Hamilton). South Island : 

 Akaroa (type) ; Little River ; Dyer's Pass ; Riccarton Bush (H. S.). 



Iti'iiiarks. This species is distinguished from E. coma by its smaller 

 size, the darker colour and its greenish hue, the very frequent absence 

 of any colour-markings, and, if present, their zigzag form 011 the 

 base. The ribs are closer and finer, the spire nearly always flat, and 

 the umbilicus wider. It is more constant in form than E. coma. 



