10 CLASS III. GASTEROPODA. ORDER II. CYCLOBRANCHIATA. 
when detached, they contract themselves into a ball like the common 
wood-louse. 
Examples. 
Pl, CXXX1. Fig. 1. 
Cuiron Hennauu, Gray, Spicilegia Zoologica, p. 5. 
Pl. CXXXI. Fig. 2. 
Cuiron Barnes, Gray, Spicilegia Zoologica, p. 5. 
Pl. CXXXI. Fig. 3. 
Cuiron striatus, Barnes, American Journ. of Science, vol. vii. n. 1. 
Chiton latus, Sowerby. 
Chiton olivaceus, Frembly. 
Pl. CXXXI. Fig. 4. 
Curron servicer, King, Zool. Journ., vol. v. p. 338. Deshayes, new 
edit. of Lamarck, vol. vil. p. 513. 
Var. Chiton Fremblyi, Deshayes. 
Var. Chiton raripilosus, Gray. 
Pl. CXXXI. Fig. 5. 
Cuiron Swarnsoni, Sowerby, Proceedings Zool. Soc., 1832, p. 27. 
Deshayes, new edit. of Lamarck, vol. vii. p. 496. 
Pl. CXXXL. Fig. 6. 
Curton Briainvitii, Broderip, Proceedings Zool. Soc., 1832, p. 27. 
Deshayes, new edit. of Lamarck, vol. vii. p. 514. 
Pl. CXXXI. Fig. 7. 
Cuiron Lysriui, Sowerby, Proceedings Zool. Soc., 1832, p. 26. Des- 
hayes, new edit. of Lamarck, vol. vii. p. 501. 
