106 PATELLA-SCUTELLASTRA. 



Var. OBTECTA Krauss. PI. 16, figs. 7, 8. 



In sculpture like P. tabularis; but narrower, more elevated, less 

 strongly ribbed. The central area of the interior is brown. 



Length 30, breadth 22, alt. 8 mill. 



Table Bay. 



P. GRANATINA Linne. PI. 62, figs. 76, 77. 



Shell large, rather thin but solid, conical, angularly ovate; apex 

 subcentral, eroded, rust-color or dark brown. Surface having 

 unequal radiating ribs or carinse, of which one at each side and three 

 in the rear are especially prominent. Color dull whitish, closely 

 marked with black spots, often zigzag or angular. 



Interior white, the portion outside of the muscle-scar having a dis- 

 tinctly fibrous appearance ; central area blackish-brown, sometimes 

 mottled with white. Border very narrow, finely dotted with black 

 and brown. Length 85, breadth 72, alt. 30 mill. 



Cape of Good Hope. 



P. granatina L., Syst. Nat. x, p. 782. LAMARCK, An. s. Vert, vi, 

 p. 324. KRAUSS, Die Siidaf. Moll., p. 43. REEVE, Conch. Icon., f. 

 4. P. apicina LAMARCK. DELESSERT, Rec. de Coq., t. 21, f. 4. 

 ? P. picta PERRY, Conchology, t. 43, f. 7. 



The prominent ribs of the exterior and the spotting of black 

 (sometimes lost by erosion) are characteristic ; inside the white, 

 fibrous appearance and deep brown center are excellent diagnostic 

 points. 



In old specimens the dark center is often considerably invaded by 

 white in the middle and forward. 



P. OCULUS (Born) Auct. PI. 27, figs. 30, 31, 32. 



Shell large, angularly oval, conic or depressed, solid. Apex in 

 front of the middle. Sculptured with large angular unequal ribs, 

 which project at the margins ; and having a secondary sculpture of 

 radiating striae when not eroded. Color blackish or dull brown 

 outside ; usually eroded. 



Interior having a very broad blackish-brown border, a light zone 

 just outside the muscle-impression, the latter strongly marked, 

 bluish-white. Area inside the impression callously thickened, yellow- 

 ish flesh-colored. 



Length 88, breadth, 75, alt. 25 mill. 



Length 64, breadth 63, alt. 12 mill, (younger shell). 



Length 110, breadth 106, alt. 42 mill, (largest specimen seen). 



Cape of Good Hope. 



