86 PATELLA. 



P. GOMESII Drouet. PL 54, figs. 17, 18. 



Shell large, subdepressed, rugose, ribbed-plicate, rather solid; 



outside grayish-brown or rufescent ; inside shining, brown, pearly ; 



apex situated at the front third of the length, obtuse ; aperture 



oval, entire. Length 50-60, breadth 50-53, alt. 12-1 5 mill. (Drouet.) 



Bay of San Lourenzo, Santa Maria, and Pico, Azores Is. 



P. gomesii DROUET, Mollusques Marins des lies A9ores, p. 39, t. 

 1, f. 6, 7, 1858. 



More depressed and less elongated than P. candei, the ribs more 

 conspicuous, the summit more obtuse. 



Referred by Simroth to P. aspera var. moreleti Drt. 



P. BAUDONII Drouet. PI. 54, figs. 15, 16. 



Shell large, subelevated, coarsely ribbed, plicate, solid, thick ; 

 outside grayish-green, inside white ; vertex subacute, submedian ; 

 aperture oval, a little crenated. 



Length 60, breadth 50, alt. 25 mill. (Drouet ) 



Santa Maria and Pico, Azores. 



P. baudoni DR., Moll. Mar. A ores, p. 41, t. 2, f. 8, 9, 1858. 



This seems to be very closely allied to P. ferruginea Gmel. It is 

 referred by Simroth to P. aspera. 



P. CANDEI d'Orbigny. PL 55, fig. 22, 23, 24. 



Shell elevated, conical, thick, smooth or irregularly roughened ; 

 ovate, margin entire. Inside buff, bluish in the middle ; outside 

 pale yellow. Length 67, breadth 58, alt. 27 mill. (Orb.) 



Canaries. 



P. candei ORB., Hist. Nat. Canaries, ii, 2d part Mollusques, p. 

 98, t. 7, f. 11, 12, 1844. REEVE, Conch. Icon., f. 34, 1854. 



P. CITRULLUS Gould. PL 28, figs. 39, 40, 41. 



Shell sub-diaphanous, thin, sub-conical, moderately elevated, sum- 

 mit prominent ; apex anterior, acute, feebly incurved, usually some- 

 what eroded ; a great number of faintly elevated lines, studded 

 with fine tubercles or asperities, radiate from it, and become obsolete 

 about half way towards the margin. Strise of increment coarse and 

 irregular, overlaying each other, so as to give the shell a rude, con- 

 centrically squamose aspect externally ; disk nearly oval, a little 

 narrowed anteriorly ; margin very thin and sharp, finely and irreg- 

 ularly undulated. External color a dusky olive-green, with a shade 



