110 GASTROPODA. [Aspidobranchia. 



Sect. 2. ANTHORA, Gray, 1857. 



Anthora, Gray, Guide Syst. Distr. Moll. Brit. Mus., 148. Type : Polydonta 

 tuberculata, Gray. 



Shell elevated, conical, more or less granulose above, lirate below ; 

 base plano-concave or flat, false umbilicus shallow, with 1 to 4 ribs, 

 outer and basal lips smooth within ; columella oblique, with, a small 

 fold above, its edge simple. 



KEY TO SPECIES. 



A. Shell with 5 beaded spiral lirse on the penultimate whorl ; 



umbilicus with 3 to 4 distant spiral ribs . . . . riridis. 



B. Shell with 4 to 6 rope-like cinguli on the penultimate whorl ; 



umbilicus with 1 spiral rib, sometimes grooved in the 



middle . . . . . . . . . . . . camelophorus. 



4. Trochus camelophorus, Webster, 1906. Plate 33, fig. 3. 



Trochus camelophorus, Webster, T.N.Z.I., xxxviii, 1905 (1906), 309, pi. 39, 

 f. 1, la. T. comis, Gmelin : Suter, T.N.Z.I., xxxviii. 323, not of Gmelin. 



Shell solid, conical, pink, false-umbilicate. Sculpture : Rounded 

 cinguli of unequal thickness, with rope-like markings, 5 to 6 on the 

 penultimate whorl ; regular radiate riblets cross the cinguli. slightly 

 beading or granulating them ; base with 5 to 6 flat spiral ribs, sepa- 

 rated by slightly narrower furrows, the whole ornamented with close 

 and fine radiate striae. Colour rose, with darker markings above the 

 periphery of the last whorl ; base yellowish-white, with radiate stripes 

 and spots of light brown. Spire conical, with a rounded apex. Proto- 

 conch 2-whorled, with traces of spiral sculpture. Whorls 5^, slightly 

 shouldered above, flat, the last sharply angled at periphery. Suture 

 marked by a deep groove behind the first roping of succeeding whorl. 

 Aperture sub quadrangular, inside slightly pearly. Outer and basal lip 

 slightly convex, forming an acute angle at their junction. Columella 

 slightly oblique, with a distinct fold above, rounded, and smooth. 

 The false umbilicus is not very deep, and with a strong spiral fold, 

 which is sometimes distinctly grooved, thus havi the appearance of 

 2 spiral ribs lying close together. 



Diameter, 12mm.; height, 10mm. (type). Diameter, 11-5 mm. ; 

 height, 11 mm. (specimen in my collection). 



Type in Mr. W. H. Webster's collection. 



Hob. Cape Maria van Diemen. 



5. Trochus viridis, Gmelin, 1790. Plate 8, fig. 9. 



Trochus viridis, Gmel., Syst. Nat., ed. xiii, 3572 : Man. Conch. (1). xi, 43, 

 pi. 3, f. 16, 17 ; x, pi. 40, f. 21 : Suter. P. Mai. S., ii, 261. Anthora 

 viridis, Grnel. : Hutton, M.N.Z.M.. 94. Polydonta tuberculata. Gray, 

 Dieff. N.Z., 239. Anthora tuberculata. Gray : Hutton, M.N.Z.M., 93. 

 Trochus acinosus, Gould, U.S. Expl. Ex., 179. f. 217. T. /vlrolabris, 

 Hombr. & Jacq., Voy. P.S., v, 56, pi. 14, f. 14-16. Polydonta tritonis, 

 A. Ad., P.Z.S., 1854, 132. 



Shell conical, solid, false-umbilicate. Sculpture of upper surface 

 consisting of 5 series to each whorl of rounded bead-like granules, 



