GASTROI'OIM. (525 



lines, decussated by much closer spiral microscopic lines. ( 'olour 

 horny-brown, sometimes spotted and banded with reddish. Epidermis 

 thin, membranous, but lightly shining. Spire convex, depressed 

 obtuse. Protoconch of If smooth flattish whorls. Whorls 5| to 6, 

 slowly increasing, rounded, broader than high ; base convex. Suture 

 impressed. Aperture oblique. Innately rotund. Peristome thin, sharp, 

 regularly arched. Colunnlla short, oblique. Inner lip scarcely re- 

 flected. Umbilicus narrow-, deep, open, about one-ninth of the greatest 

 diameter of the shell. 



Diameter Maj., 9 mm. ; min., 7-5 mm. : height, 5-75 mm. (type). 



Animal. Body elongated, the eye-peduncles long and thick, ten- 

 tacles moderate ; foot very long and narrow, compressed, not tapering, 

 truncated posteriorly, and with a caudal gland ; mantle slightly 

 reflected. Colour variable () Entirely slate-grey, or reddish-brown ; 

 (&) upper parts slate-grey, foot yellowish speckled or marbled with 

 grey ; (c) white with a few black spots, the upper anterior parts of the 

 body, except a pale band on the top of the head, slate-grey. (Hutton.) 



Dentition (Hutton, T.N.Z.I., xvi, 172, pi. 10, f. 1 ;~pl" 11, f. W).- 

 Formula of radula 28 + 1 + 28. varying from 26 to 30 ; laterals 

 11 or 12. Central tooth rather wedge-shaped, broader behind, the 

 length nearly twice the breadth ; the reflexed portion triangular, 

 slightly sinuated at the sides, less than half the length of the base. 

 \vith a moderate point. Laterals with the base rhomboidal ; the inner 

 with the reflexed portion half the length of the base, bicuspid, tin- 

 inner cusp large with a moderate point, the outer cusp small without 

 a point ; outer laterals with the reflexed portion shorter and unicuspid. 

 the point longer, reaching beyond the posterior margin of the base. 

 Marginals aculeate, with a strong curved point, which is most deve- 

 loped in the centre of the marginals. (Hutton.) 



Jaw arcuate, not tapering, with 20 to 25 flat plaits, which indent 

 the concave margin. 



Type in the Canterbury Museum. Christchurch. 



Hub. South Island : Greymouth, type (R. Helms) ; Eealey : 

 Dunedin (II. S.) : Saddle Hill.' Taieri (E/Suter) ; near Lake Te A nan 

 Dr. Dendy) : Te Oneroa, Preservation Inlet (Seymour). 



3. Phacussa Henryi, Suter, 1899. Plate 50, fig. 2. 



Flammtdina (Phacussa) Henryi, Sut., P. Mai. 8., iii, 289, p). 15, f. 10-13. 



Shell subdiscoidal, umbilicated, with depressed spire, light brown, 

 not shining, rather thin, costulate. Sculpture consisting of sharp 

 subequidistant radial riblets, about 3 per millimetre, the interstices 

 microscopically decussated by numerous incremental and spiral strise. 

 Colour uniformly light brown, the upper whorls sometimes ornamented 

 with rufous zigzag lines. Epidermis thin, membranous. Spire low, 

 depressed, conoidal. Protoconch of H whorls, faintly microscopically 

 decussate. Whorls 5, first slowly and then more rapidly increasing. 



