138 HELCIONISCUS. 



Patella ornata DILLWYN, Descriptive Catal. Recent Shells, ii, p. 

 1029, (1817)). P. nodosa HOMBRON & JACQUINOT, Ann. Sci. Nat. 

 (2), xvi, p. 191, (1841). Patella margaritaria, testa ovali, etc., 

 CHEMNITZ, Conchyl. Cab. xi, p. 180, t. 197, f. 1914, 1915 (1795). 

 P. denticulata E. A. SMITH, Voy. Erebus & Terror, Zool., ii, Moll., 

 p. 4, t. 1, f. 26. P. luctuosa OLD., Proc. Bost. Soc. N. H. ii, p. 150, 

 (1846) ; U. S. Expl. Exped. Moll. & Sh., p. 336, f. 446. Patinella 

 denticulata HUTTON, Proc. Linn. Soc. N. S. Wales, ix, p. 375 ; 

 Trans. N. Z. Inst. xv, t. 16, f. B (dentition). P. inconspicua GRAY, 

 in Dieffenbach's N. Z. ii, p. 244, (1843). Patinella inconspicua 

 HUTTON, Proc. Linn. Soc. N. S. W. ix, p. 375. Patella margaritaria 

 REEVE, Conch. Icon., f. 74. 



Easily distinguished by its coarsely nodose ribs, eleven-rayed in- 

 terior with black central area, and in the young by the alternately 

 white-spotted riblets. 



It is a very distinct species, but it has been afflicted with a number 

 of names unusual even in this genus. It has no especially close 

 relations with P. denticulata Martyn (q. v.) 



Reeve's figures of margaritaria are copied on pi. 19, figs. 39, 40. 

 They represent a large, rather round specimen. 



The correct synonymy is herein given for the first time. The 

 name margaritaria Chemnitz cannot be used, as that author was not 

 a binomialist. 



Var. INCONSPICUA (Gray) Hutton. PL 68,,figs. 20, 21, 22. 



Shell conical, high, the altitude often more than half the length ; 

 apex subcentral. Interior brown, with about twelve radiating 

 white stripes. (Hutton.) 



Wellington to Dunedin, New Zealand. 



The figures represent the luctuosa Gld. (not Hombr. & Jacq.) 

 which is the same as inconspicua. Gray's description is very poor. 



P. DENTICULATA Martyn. PL 68, figs. 23, 24 ; pi. 21, figs. 49, 50. 



Shell solid, oval, elevated, the apex more or less anterior ; sculpt- 

 ured with about 31 principal ribs, and some smaller interstitial rib- 

 lets all of them closely scale-granose. Color blackish-brown. 



Interior bluish, having a distinct, opaque, flesh-colored or dull 

 orange-brown central area. Spotted with brown around the edge. 



Length 55, breadth 43, alt. 24 mill. 



Wellington to Dunedin, New Zealand. 



