SYKES : POLYTLACOPnOEA FEOM POET PHILLIP. 87 



One specimen only. It is in general of a greenisli hue, with the 

 dorsal ridge yellowish, marked with brown. The colouring as 

 described by authors is a rufous brown. 



4. IscHNOCHiTON (Heteeozoxa) caeiosus (Carpenter MS.), Pilsbry. 



Ischiochiton {Heterozona) cariosus, Carpenter : Pilsbry, Man. Conch., 

 scr. I, vol. xiv, p. 65, pi. xxiv, figs. 20-3 ; vol. xv, p. 82, 

 pi. xiv, fig. 8. 



Mr. Pilsbry notes that the anterior and posterior valves have eleven 

 slits : in a specimen that I have separated there are only ten. This, 

 however, is frequently a variable characteristic. 



5. IscHNocHiTON CBisPTJs (Eeove). 



Chiton crisptin, E-eeve : Conch. Icon., pi. xix, fig. 120, May, 1847. 

 Ischnochiton crispus, Reeve : Pilsbry, Man. Conch., ser. I, vol. xiv, 



p. 89, pi. xxiv, figs. 98-9. 

 Ischnochiton Iladdoni, Pilsbry: Man. Conch., ser. I, vol. xiv, p. 88, 



pi. xxii, figs. 67-73; Proc. Acad. Nat. Sci. Philad. 1894, 



p. 71. 

 Chiton longic]/inha, P)lainville : Sowcrby, Conch. Illust., fig. 67; Pveove, 



Conch. Icon., pi. xxiv, fig. 163 [no7i Blainville). 

 Ischnochiton longicymha, Elainville : Haddon, "Challenger" Ucport, 



p. 17 {lion Plain ville). 



This species appears to vary greatly in colour and markings. Some 

 are nearly white, but the generally prevailing colours seem to be olive 

 or green in various shades ; some specimens have a white band along 

 the back. One specimen is so remarkable that I venture to describe 

 it as var. decorata. In this the ground colour is nearly white, and 

 the colour pattern is formed by regular rows of nearly black bands. 

 There are also specimens of this form in the collection of the British 

 Museum. None of the other specimens that I have seen show any 

 gradation to this form of colour-marking. At the request of 

 Mr. Pilsbry, I examined specimens of his /. Iladdoni and compared 

 them with the type of /. crispus, the result being published in The 

 Nautilus} 



6. IscHNOcniTON Tateanus, Bednall. 



From a specimen, very kindly named by Mr. Pilsbry, I have been 

 able to identify three specimens of this, as yet undescribed, species, 

 vningled with my /. crispus. I forbear to describe it, as I understand 

 that Mr. Pednall will do so shortly. 



7. Ischnochiton conteactus (Reeve). 



Chiton contractus, Pteevc : Conch. Icon., pi. xv, fig. 78, May, 1817. 

 Ischnochiton conlractm, Reeve: Pilsbry, Man. Conch., ser. 1, vol. xiv, 

 p. 93, pi. xxiii, figs. 81-2; Nautilus, vol. viii, p. 129. 



1 The Nautilus, vol. viii, p. 129, March, lS9o. 



