SYKES : rOLTPLACOrnOKA. FKOM POET PHILLIP. 89 



most easily recognized by its elongate form and generally wliite colour. 

 " The very fine girdle-scales ally it to Isch. ustulatus, Reeve ; but 

 they are smooth, while /. ustulatus has the scales striated " (Pilsbry 

 in MS.). 



^ 10. IscHNOCHiTON WiLSONi, n.sp. PL VI, Tigs. 1, Iff. 



I Shell oval, moderately elevated, carinate. Surface smooth to the 



', naked eye, bnt under a lens minutely granular. Colour a rosy pink 



I marked on all the valves with minute streaks and patches of white 



and brown. The pattern is more noticeable on the median areas in 



' the central valves than on the lateral areas. Girdle yellowish. The 



sutures of the median valves are slightly concave, and the beaks 



are moderately prominent. The lateral areas are but very slightly 



raised, and the diagonal is inconspicuous, except for its being a line 



where the colour-marking changes in pattern. Tail-valve slightly 



' produced posteriorly, with the mucro just in front of the middle. 



Interior of valves of a rosy hue. Tail-valve with ten slits ; head- 



, valve with nine slits, irregularly disposed ; median with but one. 



1 The girdle-scales are small, yellowish -white, and, under a lens, 



conspicuously striated. Length about 16 mm., breadth about 8 mm. 



( This species appears to belong to the smooth group of Australian 



j Isehnochitons. It is of a general rosy hue, and is not so much 



, elongated as the last species, from which it may be at once separated, 



, as also from /. smaragdmtis and allied species, by its striated girdle- 



' scales. I have much pleasure in associating with it the name of 



J Mr. Wilson, the discoverer. 



j 11. ISCHNOCHITON, Sp. 



The specimens arc so minute that, though I cannot place them 

 as the young of any known species, I forbear to describe them. 

 Further specimens are required to show their true position. 



12. IscHNOCHiTON (Ischjtoeadsia) Australis (Sowerby). 



Chiton Amtralis, Sowerby: Mag. Nat. Hist., n.s., vol. iv, June, 1840, 



p. 290; Conch. Illust., fig. 46 ; Eeeve, Conch. Icon., pi. ii, 



fig. 10. 

 Chiton {Ischiorachia) Australis, Sow. : Shuttlw., Bern. Mittheil. 1853, 



p. 66. 

 Lophyrus Australis, Sow.: Angas, Proc. Zool. Soc. 1867, p. 221. 

 Lepidoradsia Australis, Sow.: Dall, Bull. U.S. Nat. Mus., i, p. 79 



(dentition), p. 115 (branchiae), pi. ii, fig. 19 (dentition); 



Haddon, "Challenger" Report, p. 19. 

 Ischnochiton {Ischnoradsia) Australis, Sow. : Pilsbry, Man. Conch., 



ser. I, vol. xiv, p. 144, pi. xviii, figs. 57-9 ; vol. xv, p. 87, 



pi. xvii, figs. 68-9; Proc. Acad. Nat. Sci. Philad. 1894, 



p. 72. 

 Chiton evanidm, Sow.: Mag. Nat. Hist., n.s., vol. iv, 1840, p. 291 ; 



Conch. Illust., fiig. 139. 

 Chiton metallicus, Eeeve : Conch. Icon. 1847, pi. xvii, fig. 104. 



VOL. II. — JULY, 1806. 7 



