Flammulinn.] UASTROPODA. 679 



Outer lip sharply angled ; basal lip convex. Columella oblique, arcu- 

 ate. Perforation narrow. 



Diameter Maj., 5 mm. ; min., 3 mm. : height, 1-5 mm. 



Animal unable to withdraw completely into its shell ; the mantle 

 rather broadly reflected over the margin of the shell ; eye-peduncles 

 short and stout, separated at their bases ; orange-yellow, the upper 

 sides thickly marbled with black ; the oculiferous and lower ten- 

 tacles black. 



Jaw nearly straight, thin, striated in the centre, and slightly folded 

 towards the ends. 



Radula having the formula 28+1 + 28; laterals about 9. Central 

 and inner laterals tricuspid, the outer laterals with the entocone 

 small, the ectocone disappearing ; marginals first bicuspid, then with 

 about 5 cutting-points, of which the two inner are much larger. 



Type in the Canterbury Museum. Christchurch. 



Hob. -Greymouth (R. Helms). 



9. Flammulina olivacea, Suter, 1892. Plate 26, fig. 17, a, b. 



Amphidoxa (Calymna) olivacea, Sut., T.N.Z.I., xxiv, 290, pi. 21, f. 13-15. 

 Gerontia '(Calymna) olivacea, Sut. : Pilsbry, Man. Conch. (2), viii, 75, 

 pi. 22, f. 61-63. Flammulina (Calymna) olivacea, Sut. : Hedley and 

 Suter, P.L.S. N.S.W. (2), vii, 645 ; Suter, J. de Conch., xli, 242. 



Shell small, globosely depressed, perforated, shining, thin and 

 fragile, costate, pellucid. Sculpture consisting of very close - set 

 arcuate radial riblets, about 10 per millimetre, interrupted on the 

 upper surface by several distant but distinct spiral grooves. Colour 

 pale yellow-olive, without any colour-markings. Epidermis very thin, 

 shining. Spire slightly elevated, obtuse, its height about three-quarters 

 that of the aperture. Protoconch of 1J smooth whorls. Whorls 3. 

 rapidly increasing, convex, the last slightly flattened above ; bas< 

 rounded and with a deep infundibuliform depression round the per 

 foration. Suture deep. Aperture oblique, rotundly ovate, slightl) 

 excavated by the parietal wall. Peristome very thin, straight, regu- 

 larly arched, the upper part of the outer lip advancing ; margins 

 approximating. Columella subvertical, slightly arcuate. Inner lip 

 thin, sharp, not reflexed. Perforation very narrow and not deep. 



Diameter Maj., 5 mm. ; min., 4 mm. : height, 3-5 mm. Aper- 

 ture Height, 2 mm. ; breadth, 2-5 mm. 



Jaw arcuate, with numeroiis vertical plaits, indenting the upper 

 margin. 



Radula with the formula 100 x 17 + 8+1 + 8+17. Central tooth 

 tricuspid ; laterals very similar to the central, but with longer cutting- 

 points ; marginals first bicuspid, then with 3 to 4 denticles, which 

 coalesce on some of the outer teeth. 



Type in my collection. 



Hob. Hillyer's Creek, Auckland (C. T. Musson). Apparently a 

 rare shell. 



