182 CHITON. 



SAVIGNY, Descript. de 1'Egypte, Gasterop., t. 3, f. 9. Chiton 

 affinis ISSEL, Malac. Mar Rosso, p. 234 (1869). C. siculus Gray, 

 COOKE, Ann. Mag. N. H. 1885, p. 275. E. A. SMITH, Proc. Zool. 

 Soc. Lond. 1891, p. 392. 



I have not seen this species, which is considered by Cooke and 

 Smith to be synonymous with the common Mediterranean C. siculus 

 of Gray (otivaceus Spengl.). Smith says that it " may be regarded 

 as a strongly marked form of the Mediterranean species. There is 

 also a species found in New Zealand, C. siculoides Cpr., M8S.= C. 

 cereus Reeve, which is also inseparable." As I do not know that 

 Mr. Smith's opinion is founded upon a study of the inside as well as 

 the external characters, I prefer to retain C. affinis as a distinct 

 species for the present, although it is certainly closely allied to C. 

 olivaceus. Issel gives both figs. 8 and 9 of Savigny's plate as illus- 

 trations of his species, but his description applies only to figs. 9. 

 Savigny's figs. 8 represents, in all probability Callistochiton adenensis 

 Smith. 



C. RUBICUNDUS Costa. PI. 45, figs. 73, 74, 75. 



Shell similar in form and color to Trachydermon ruber, but much 

 smaller ; subelongate, much elevated, the valves beaked ; dorsal 

 ridge very acute ; mucro median, elevated. Entire surface micro- 

 scopically granulose, the central areas having spaced, longitudinal 

 parallel sulci, 6 to 9 on each side ; lateral areas subelevated, smooth. 



Inside having 8-10 slits in the anterior valve, 1 in the central 

 valves, 9 in posterior valve ; teeth acute, but all distinctly serrated ; 

 eaves moderate; sinus moderate; sutural-plates joined by a small 

 serrated lamina. 



Girdle regularly imbricated with large, solid, smooth scales. 



Length 8?, breadth 5 mill. ; divergence 80. 



Length 6, breadth 2? mill. 



Naples (Philippi) ; Dalmatia (Mus. M'Gill Coll. and Acad. Nat. 

 Sci., Phila.) 



Chiton rubicundus O. G. COSTA, Catalogo sistematico e ragionato 

 de' Testacei della due Sicilie, p. i, iii, 1. 1, f. 2 (Naples, 1829); Fauna 

 di Napoli, Anim. Molli, Chiton, p. 8. Chiton pulchellus PHILIPPI, 

 Enum. Moll. Sicil. ii, p. 83, t. 19, f. 14. Chiton rubellm CPR., MS. 

 olirn, and C. ? corallinus CPR., MS. 



Doubtful synonyms : Ch. freelavdi FORBES, Rep. Aeg. Invert., 

 in Rep. 13th meeting Brit. Asso. Adv. Sci., for 1843, p. 188 (1844). 

 C. scytoderma SCACCHI, C. philippii ISSEL. 



