PATELLA. 1061 



naus. Raclla in the Archipelago. Tournefort. Goree. 

 ^dansoti. St. Domingo and Martinique. Favanne. 

 Shell varying in length from one inch to two inches and a half, 

 and the breadth is about two-thirds of the length ; the co- 

 lour is white or greyish white, with broadisli brown or vio- 

 let rays ; the longitudinal ribs are often alternately larger, 

 but not regularly so, and they are generally more or less fur- 

 nished with small vaulted scales ; the inside is white with a 

 border, or otherwise tinged with green, and the margin is 

 slightly crenated. 



NUBECULA. 101. Shell ovate, with alternate rose- 

 coloured and white rays, and very slightly 

 striated ; perforation oblong. 



Patella Nubecula. Linnaus Si/st. Nat. p. 1262. Gmelin, 



p. 3729. 

 Patella rosea. Gmelin, p. 3730. 

 Patella, No. 156. Schroeter EwL ii. p. 507. 

 Lister Conch, t. 529. f. 22.? Martini, i. p. 141. 1. 12. f. 

 105. 



Inhabits the Mediterranean. Linnaus. Coasts of Jamaica. 

 Marti7ii. 



Shell about three-quarters of an inch long, and half an inch 

 broad, and is elegantly variegated with red and white rays 

 extending from the summit to the margin ; the inside is 

 white more or less tinged with green, and has a brownish or 

 rose-coloured ring surrounding the perforation ; Linnaeus 

 has described the perforation of P. Nubecula to be ovate, 

 whereas that of Gmelin's P. rosea is said to be oval, and in 

 my specimens, which otherwise answer both these descrip- 

 tions, it is oblong. Born has erroneously quoted Martini's 

 figure 105, together with 91 and 92, for P. nimbosa. 



PORPHYROZONiAS. 102. Shell oblong, with unequal 

 longitudinal sub-nodulous ribs, and the per- 

 foration small and circular. 



Patella Porphyrozonias. Gmelin, p. 3730. 

 Patella, No. 155. Schroeter Einl. ii. p, 507. 

 Martini, i. p. 140. t. 12. f 102 and 103. 



Inhabits the coasts of North America. Martini. 



This shell is of about the same size as P. Nubecula, but has 

 the summit more elevated, and is irregularly ribbed longitu- 

 dinally ; the colour is dirty white, variegated with purplish 

 or reddish rays, which are sometimes interrupted by four or 



YOL. II. 2 I 



