HELCIONISCUS. 139 



Patella denticulata MARTYN, Univ. Conch, i, t. 65 (1784). P. 

 imbricata REEVE, Conch. Icon. f. 95 (1855), not P. imbricata Linne. 

 -P. reevei HUTTON, Man. N. Z. Moll. p. 108 (IS&ty.PatineUa 

 reevei HUTTON, Proc. Linn. Soc. N. S. Wales, ix, p. 376 (1884). 



Differs from other New Zealand species in the closely scaled ribs, 

 opaque " rust orange " or fleshy central area of the interior, etc. It 

 is a solid species, attaining a considerable size. 



Reeve referred denticulata Martyn to P. graniilaris as a synonym 

 and made a new species, " imbricata" of the New Zealand shell. 

 Hutton has followed Smith in mistaking the P. ornata Dillw. (mar- 

 garitaria Chemn.) for Martyn's shell an error immediately de- 

 tected by a reference to the excellent figures in the Universal Con- 

 ch ologist. 



In order to finally settle the name and synonymy of this species, 

 I have copied Martyn's original figures on my plate 68, figs. 23, 24. 



P. RADIANS Gmelin. PI. 69, figs. 25-39 ; pi. 23, figs. 4, 6, 7, 8. 



Shell ovate, depressed, thin but solid, slightly narrower in front, 

 the apex at the front fourth or fifth, not prominent. Surface 

 sculptured with decidedly separated, narrow radiating riblets, hav- 

 ing a number of smaller riblets (sometimes obsolete), in each inter- 

 val, and decussated by fine, crowded growth-striae, often obsolete, 

 but usually cutting the surface just in front of the apex into fine 

 granules. Color bluish-white, usually buff around the apex, striped 

 in a divaricating pattern, or irregularly blotched and rayed down 

 the ribs with brown or olive. 



Interior buffish-olive, with a silvery luster, showing the color- 

 markings of the outside, having a white or brown central callus, 

 often ill-defined. 



Length 44, breadth 34, alt. 8 mill, (typical form). 



Throughout New Zealand; Australia. 



P. radians GMEL., Syst. Nat. xiii, p. 3720 (1789). HUTTON, 

 Man. Mar. Moll. N. Z. 1880, p. 108 ; Trans. N. Z. Inst, xv, t. 16, f. E 

 (dentition). P. argentea Q. & G., Voy. Astrol. Zool. iii, p. 345, t. 

 70, f. 16, 17 (1834). P. argyropsis LESSON, Voy. Coquille, p. 419 

 (1830). P. radiatilis HOMER. & JACQ., Ann. des Sci. Nat. (2), 

 xvi, p. 191 (1841). P. decora PHIL., Zeitschr. f. Mai. 1848, p. 162 ; 

 Abbild. t. 3, f. 3. RVE., Conch. Icon. f. ZZ.Patinella radians 

 HUTTON, Proc. Linn. Soc. N. S. Wales, ix, p. 336 (1884). Patella 

 earlii REEVE, Conch. Icon. f. 71 (1855). P. flexaosa HUTTON, Cat. 



