CHITON. 105 



shells differ from the true Auriculae in the thinness of the outer 

 lip. C. Dombeyana (Auricula Dornbeyana, Auct.) Fig. 300. The 

 illustrated catalogue published by the author (Sow. Conch, illustr. 

 parts 135, 136) contains 13 species. Rivers of South America. 



CHILOTREMA. Leach. A sub-genus of Helix, containing Helix 

 lapicida, Auct. Gray, Turton, p. 140. 



CHIMOTREMA. — ? Belongs to Helix. 



CHIONE. Megerle. CytherjEa maculosa, (fig. 117, c.) sulcata, 

 circinata, &c. Auct. and other similar species. 



CHIRONA. Gray. A genus of Balanidee, the shells consisting 

 of six parietal valves and two opercular valves ; the upper edges 

 of the parietal valves are sloped and the structure is not tubular. 



CHISMOBRANCHIATA. Bl. The second order of the first 

 section of Paracephalophora Monoica, Bl. Those Mollusca be- 

 longing to this order which have shells, have them either internal 

 or external, but always scutiform, with depressed spires and 

 wide, haliotoid, oblique apertures, without a columellar lip pro- 

 perly so called. This order partly answers to the family Macros- 

 tomata, in the system of Lamarck. It contains the genera 

 Coriocella, Sigaretus, Cryptostoma, Oxinoe, Stomatella and 

 Velutina. 



CHITON. Auct. (x iT0V > an integument.) Fam. Phyllidiana, 

 Lam. Class, Polyplaniphora, Bl. — Descr. Oval, consisting of 

 eight arched valves arranged in a series across the body of the 

 animal and fixed in the skin which forms a rim around them, 

 sometimes scaly, spinose, or rugose, sometimes smooth. — Obs. 

 The genus Chiton, commonly called "Coat of Mail," from its re- 

 semblance to jointed armour, remains to the present day in exactly 

 the same state with regard to its boundaries as that in which 

 Linnaeus found it, and in which he left it. That illustrious 

 Naturalist placed it among the multivalves in his purely Concho- 

 logical system, although the animal is totally different from the 

 Cirripedes. The shells are prettily marked, and are found attached 

 to the rocks in all seas of Tropical and Southern climates, but fossil 

 species are almost unknown. Fig. 227, C. Spinosus. The genus 



