PATELLA-ANCISTROMESUS. 107 



P. oculus BORN (in part), Mus. Cses. Vindob. p. 418. SOWB., 

 Conchol. Manual, f. 229. REEVE, Conch. Icon. f. 2. P. badia 

 Gmel. Syst. p. 3700. P.fuscescens GMEL., Syst. p. 3701. P. schrce- 

 teri KRAUSS, Die Siidafric. Moll. p. 43. 



Allied to P. granatina, but not variegated outside except in the 

 young (fig. 32), and entirely different in color inside ; this species 

 being broadly black bordered with a light central area. The more 

 markedly stellate forms, such as fig. 31, approach P. longicosta in 

 outline, but the coloring of the interior is constantly distinct. 



It seems advisable to retain the well-known name oculus for this 

 species, despite the fact that Born included another and probably 

 distinct species with this, in his references. 



P. LONGICOSTA Lamarck. PL 28, figs. 37, 38. 



Shell depressed, star-shaped, having 7 to 9 principal ribs which 

 are carinated and project at the margins, and a variable number of 

 smaller projecting ribs. Color black, usually rayed with whitish. 



Interior white, the central area often yellowish or flesh- colored, in 

 the young generally stained or mottled with blue-black. The 

 laciniate edge is bordered with black, often dotted with gray-white, 

 rarely entirely white. Length 75, breadth 70, alt. 20 mill. 



Table Bay, Cape of Good Hope. 



P. longicosta LAM., An. s. Vert, vi, p. 326, 1819. DELESSERT, 

 Rec., t. 21, f. 3. REEVE, Conch. Syst. ii, p. 136, f. 6 ; Conch. Icon., 

 f. 11. POT. & MICH., Galerie, i, t. 37, f. 7, 8. P. gorgonica 

 HUMPH, mss., teste Reev^. 



Allied to some forms of P. oculus, but much more distinctly 

 stellate, and having a narrower black border within. 



Section Ancistromesus Dall, 1871. 



Ancistromesus BALL, Amer. Jour. Conch. Apr. 4, 1871, p. 276. 



Shell very large and heavy, its inner layer porcellanous, opaque. 



Animal with a complete branchial cordon, the lamellae long and 

 slender, subequal ; sides of foot smooth ; radula furnished with a 

 simple rhachidian tooth having a cusp ; the two inner laterals on 

 each side anterior to the third pair, which are large and quadri- 

 dentate ; uncini simple. 



Formula of teeth 3 (i 212 i) 3 . PL 31, fig. 62. 



The shell resembles very closely, in texture, sculpture and form, 

 the larger South African species of Patella (Scutellastra of my 



