PATELLA. 89 



P. nigroaguamoM DKR., Zeitschr. f. Mai. 1846, p. 25. P. nigro- 

 squamosa var. minor DKR., Ind. Moll. Guin. Infer, p. 41, pi. 7, f. 

 4-6. 



We must retain this name for the Azores form for which it was 

 originally proposed. Dunker subsequently included the larger 

 Cape species, P. natalensis. 



Compare P. guttata Orb. of which this may prove to be a variety. 



P. RANGIANA ( Valenciennes) Rochebrune. PI. 58, figs. 42, 43. 



Shell ovate, depressed-convex, rufous ; vertex submucronate, 

 usually eroded, situated at t of the length ; having larger and 

 smaller radiating broad, very scaly ribs, scales subimbricating, 

 obtuse, lenticular ; margin undulating ; interior bluish, silvery- 

 pearly, rayed with bands and spots of purplish, the center spatulate, 

 pale orange. Length 44, breadth 36, alt. 19 mill. (Rocnebr.') 



Porto Praya, Cape Verdes. 



P. rangiana (Valenc. ms.} ROCHEBRUNE, Bull. Soc. Philomathique 

 de Paris, 7th Sen, vi, p. 29, 1882; Nouv. Arch, du Mus. 2dSer., iv, 

 p. 267, t. 18, f. 7, 1881. 

 P. GUIXEEXSIS Dunker. PI. 12, figs. 34, 35, 36, 37, 38. 



Shell oval, sometimes elliptical, subelevated, rather solid, con- 

 centrically striate and subrugose; furnished with close, unequal 

 subnodose radiating ribs, in part obsolete. Buff-orange, rayed 

 and variegated with brown. Apex projecting, inclined forward, 

 submamillar, situated at the front of the length. 



Interior buff-orange, center milky and lurid. Margin acute, 

 slightly crenulated, nearly simple, Length 27 mill. Ratio of 

 length, breadth and alt. = J 00 : 88 : 30. (Dkr.) 



Loan da, Guinea. 



P. guineensis DKR., Ind. Moll. Guin. Infer, p. 40, t. 7, f. 19, 20, 

 21, 1, 2, 3. 

 P. SPECTABILIS Duuker. PI. 12, figs. 45, 46, 47. 



Shell ovate, subdepressed, solid, buff or dull white, rayed with red- 

 dish ; apex somewhat obtuse, situated at the length, or the space 

 in front bearing to the space behind the apex the ratio of 3 to 4. 

 Having numerous radiating ribs, which are rugulose, subnodose, 

 subimbricated toward the margin. Interior bluish, the center 

 white ; margin irregularly folded, crenulated, scarcely angular. 

 Length 43, breadth 34*, alt. 12 mill. A large example measures 

 62 mill, in length. (Dkr.~) 



Loanda, Guinea. 



