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CONCHOLOGY. 



4. Genus Patella. PI. TX. 



Animal. Body completely covered by the shell ; head with 

 two acute tentaculse, and the eyes situated at their exterior base ; 

 branchiae placed under the mantle and around the body. 



Shell. This numerous and beautiful genus of Linnaeus has 

 been subdivided into the several 'distinct genera of Fissurella, 

 Emarginula, Navicella, Umbrella, Pileopsis, Calyptrea, Crepidula. 

 Parmophora, and Ancylus ; each of which possesses sufficiently 

 well-defined characters to authorize a separation, by which they 

 may be more easily distinguished from the still widely extended 

 family of Patella. Oval, conic, or a little depressed, outside green 

 or brown, sometimes radiated with various colours ; having di- 

 vergent striae and concentric wrinkles, inside glossy, iridescent, 

 with yellow or fawn-coloured, purple, blue, or brown radiations. 

 Inhabits almost every coast. Forty-nine species. 



Patella safiana. 

 P. testitudinaria. 

 P. cochlear. 

 P. compressa. 

 P. granularis. 

 P. decaurata. 

 P. Magellanica. 

 P. stellifera. 

 P. vulgata. 

 P. maramillaris. 

 P. lineata. 

 P. leucopleura. 

 P. notata. 

 P. Tarcntina. 

 P. punctata. 

 P. puncturata. 

 P. Javanica. 

 P. tuberculifera. 

 P. miniata. 

 P. pellucida. 

 P. tricostata. 



Patella Australis. 

 P. apicina. 

 P. granatina. 

 P. oculus. 

 P. Galathia. 

 P. pectin ata. 

 P. viridula. 

 P. scutellar. 

 P. radians. 

 P. caerulea. 

 P. plumbia. 

 P. umbrella. 

 P. p3"ramidata. 

 P. luteola. 

 P. aspera. 

 P. spinifera. 

 P. longicosta. 

 P. barbata. 

 P. angulosa. ' 

 P. saccharin a. 

 P. laciniosa. 



P. plicata. 



