Report on the zoological collections made in the Indo-Pacific Ocean ...

;84 COLLECTIONS FROM MELANESIA,The single specimen from the latter locality is rather more coarselygranulated than those from Flinders Island, which have been examinedby the late Dr. P. P. Carpenter, and bear his manuscriptname ashestoides.117. Chiton (Tonicia) fortiliratus.Chiton fortiliratus, Reeve, Couch. Icon. fig. 112.Hub. Port Darwin, 8-10 fms., sand and mud {Coppinger) ;Raines Island, Torres Straits {Reeve).The single specimen collected by Dr. Coppinger is of a greyishpinkcolour, copiously blotched with black along the sides of someof the valves. The head-plate is regularly well-curved forward,rather high, the posterior margin being obtusely angled in themiddle. The inserted edge is much thickened, coarsely striatedexteriorly and on the broad margin, and divided into nine unequalparts by eight short narrow slits. The exterior surface is coarselysubsquamately granulated throughout, and exhibits numerous minuteblack raised dots, disposed in rather irregular radiating series. Thesecond valve is long in comparison with those which follow, feeblypeaked behind ; the fourth, fifth, and sixth plates are about equal inwidth and a trifle broader than the third and seventh. All the intermediatevalves are \ery coarsely ridged and sulcated on the centralareas, and coarsely grained and minutely black-dotted at the sides.The ridges are flat-topped, clean-cut, nearly smooth, attenuatedposteriorly, wavy, converge on each side towards the front, and theintervening grooves are finely punctate. All have the hinder marginnearly straight, and but very feebly pointed at the posterior apex.The laminaD of insertion of these valves are thin, narrow at thesides, moderately deeply sinuated in front, strongly striated abovein rear of and for a short distance in froijt of the single minutelateral slit on each side. The posterior valve is strong and thick,obtusely mucronated at the centre, very coarsely striated and serratediipon the thickened inserted margin, which is subdivided byabout ten distinct notches. The interior of the valves is light lividbluish, with a reddish stain along the middle of all, with the exceptionof the last. The mantle, as described by Reeve, is simply" horny." Length without girdle IS millim., diameter of fifthvalve 9.The type is a larger specimen, being 24 millim. long, with an extremewidth of 13.118. Chiton (Chitonellus) striatus.Cbitonellus striatus, Lamarck, An. s. Vert. ed. 2, vol. vii. p. 481Sowerbif, Gen. fig. 4; id. Conch. III. tig. 62 ; Reeve, Conch. Icon.fig. 4; Conch. Syst. pi. 135. fig. 1.Chitonellus oculatus, Reeve (? of QuoiJ), 1. c. figs. 7 a, b.Var. = Chitonelkis gunuii, Reeve, fig. 5.Chitonellus rostratus, Reeve, tig. 6.