138 HELCIONISCUS. 



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

 1029, (1817)). — P. nodosa Hombron & Jacquinot, Ann. Sci, Nat. 

 (2), xvi, p. 191, (18-1:1). — Patella viargaritaria, 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 Gld., Proc. Bost. Soc. N. H. ii, p. 150, 

 (1846) ; U. S. Expl. Exped. Moll. & Sh., p. 336, f. UQ.—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 inconspicxia 

 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 ai^a, 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. PI. 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. DENTKJULATA Martyn. PI. 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. 



