p. /)!prrata Gould (pi. 29, figs. 50-52) is identical. The P. rua- 

 tica of Liniie (Syst. Nat. x) is, according to Hanley, who has studied 

 Liune's type, the same as lusitanica; but Lin ne afterward described 

 another and entirely different shell under the same name, and as his 

 original description is insufiicient, the name rust lea had better l)e 

 dropped entirely. 



The conical, compact form and subgranose riblets, dotted with 

 blackish, are characteristic. The species may perhaps be found to 

 intergrade with P. guttata Orb., but proof of this is lacking at 

 present. 



P. GUTTATA d'Orbigny. PI. 56, figs. 29, 30, 31. 



Shell elevated (the young depressed), conical, thick, unequally 

 ribbed, the ribs alternately large and small, longitudinally tuber- 

 culate, the tubercles black ; interior grayish, yellowish-red in the 

 middle. (Orb.) 



Length (adult specimen) 54, breadth 46, alt. 35 mill. 



Length (young specimen) 23, breadth 19, alt. 5 mill. 



Teneriffe and Grand Canary Is., Canaries. 



P. guttata Orb., Hist. Nat. Canaries, Moll., p. 98, t. 7b, f. 13-15, 

 1844. — Reeve, Conch. Icon,, f. 91. — Dautzenberg, Mem. Soc. 

 Zool. Fr. iii, p. 161, 1890.— P. frauenfeldi Dunkeii, Verb. k. k. 

 zool.-bot. Ges. in Wien, xvi, p. 914, 1866. — Frauenfeld, Reise 

 der Oesterreichischen Fregatte No vara, Zool. Theil, ii, Moll., p. 15, 

 t. 2, f. 26. 



The black nodules upon the ribs and the red stained interior are 

 prominent and characteristic marks. It is somewhat allied to P. 

 granularis, natalensis, etc. 



P. nigrosquamosa Dkr. is probably a variety or synonym of this 

 species. Yon Martens (Zool. Rec. iii, p. 188) having examined part 

 of the original specimens o£ P. frauenfeldi, considers them identical 

 with guttata. The locality " Madras " is an error. 



P. nigrosquamosa Dunker. PI. 13, figs, 57, 58, 59. 



Shell ovate, convex-conic, whitish with large and small scaly radi- 

 ating ribs; scales erect, blackish. Apex subcentral, rather acute. 

 Margin crenulated, (Dkr.) Length 19 mill. 



Horta, Fayal Is., Azores. 



