90 CONCHOLOGY. 
4, Genus Patella. Pl. IX. 
Animal. Body completely covered by the shell; head with 
two acute tentacule, and the eyes situated at their exterior base ; 
branchiz placed under the mantle and around the body. 
Shell. This numerous and beautiful genus of Linneus 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 striz 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. Patella Australis. 
P. testitudinaria. P. apicina. 
P. cochlear. P. granatina. 
P. compressa. P. oculus. 
P. granularis. P. Galathia. 
P. decaurata. P. pectinata. 
P. Magellanica. P. viridula. 
P. stellifera. P. scutellar. 
P. vulgata. P. radians. 
P. mammillaris. P. cerulea. 
P. lineata. P. plumbia. 
P. leucopleura. P. umbrella. 
P. notata. P. pyramidata. 
P. Tarentina. P. luteola. 
P. punctata. P. aspera. 
P. puncturata. P. spinifera. 
P. Javanica. P. longicosta. 
P. tuberculifera. P. barbata. 
P. miniata. P. angulosa. =~ 
P. pellucida. P. saccharina. 
P. tricostata. P. laciniosa. 
P. plicata. 
