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PHYLLIDIANA.— Four Genera. 



Some are without shells, cither internal or external; others are wholly or 

 partly covered by a shell, sometimes composed of one single piece, sometimes 

 of a range of moveable and distinct pieces. 



Phyllidia. Has no shell. 



Chitonellus. Body elongated, rather narrow, like a caterpillar, the 

 middle of the back furnished with a multivalve shell; valves alternate, mostly 

 longitudinal; they are nearly connected by their extremities. 



C. lsevis, C. striatus. 



Chiton. Body oval oblong, convex, rounded at the extremities; bor- 

 dered all round by a coriaceous skin; partly covered by a longitudinal series 

 of testaceous, imbricated, transverse, moveable pieces, set in the borders of 

 the mantel. 



C. gigas, 

 squamosa, 

 Peruvianus, 

 spinosus, 

 fascicularis, 

 bistriatus, 

 fulvus, 

 piceus, 

 granulatus, 

 aculeatus, 

 fasciatus, 

 marmoratus, 

 maculatus, 

 tunicatus, 

 girgiculatus, 

 castaneus, 

 ruber, 



punctatus, 



indus, 



viridis, 



lineatus, 



sulcatus, 



bicolor, 



crerasinus, 



Magellanicus, 



fuscus, 



minimus, 



cimex, 



asellus, 



Icelandicus, 



albas, 



marginatus, 



cinereus, 



C. tuberculatus, 

 laevis, 



tessellatus, 

 crinitus, 

 hispidus, 

 thalassinus, 

 porosus, 

 larva? formis, 

 undulatus, 

 luteolus, 

 nebulosus, 

 setosus, 

 olivaceous, 

 variegatus, 

 latus, 

 asselloides, 



siculus, 



carmichaelis, 



capensis, 



echinatus, 



niger, 



striatus, 



spiniferus, 



coquimbensis, 



lumingii, 



granosus, 



glauco-sinctus, 



granulosus, 



disjunctus, 



elegans, 



lineolatus, 



chilensis. 



Patella. Shell univalve, not spiral, covering the animal, shield-like or 

 retuse, conical, concave and simple below, without any fissure on the margin; 

 the summit entire, and inclosed anteriorly. 



apicina, 



granatina, 



oculus, 



barbara, 



plicata, 



laciniosa, 



saccharins, 



angulosa, 



P. barbata, 



' longicosta, 



1 spinifera, 



' aspera, 



' luteola, 



' pyramidata, 



' umbella, 



' plumbea, 



. cosrulea, 

 radians, 

 scuttelaris, 

 safiana, 

 testudinaria, 

 cochlear, 

 compressa, 

 granulans, 



. deaurata, 

 Magellanica, 

 stellifera, 

 vulgata, 

 mamillaris, 

 lineata, 

 leucopleura, 

 notata, 



