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276. Emarginula planulata, A. Adams, 34, XII. VIII.A single specimen apparently inseparable from this species.MARINE MOLLUSCA. 619Family CHITONIDAE.277. Chiton (Sclerochiton) miles, Carpenter, 34, X/r. I.Torres Straits is the only locality previously known for this Chiton.278. Schizochiton incisus, Sowerby, 34, X/T. I.This I believe is the tirst record of the occurrence of this remarkable species in the Indian Ocean.Family ISCHNOCHITONIDAE.279. Callochiton platessa, Gould, 34, XIV. V.280. Ischnochiton hululensis, n. sp. (PI. XXXVI. figs. 3—6). IX.Testa ovata, mediocriter elata, roseo-albida, punctis roseo-griseis numerosis ornata, cingulo minutesquaniulato, albido viridi-griseo maculato, circumdata ; valvae undique minute decussatae, anticatransversim corrugata, lamina inserta brevi, fissuris novem instructa, medianae areis lateralibus benecircumscriptis, elatis, transversim corrugatis, postica mucrone centrali instructa, dimidio posterioriconvexo, anteriore concavo et corrugato, lamina inserta fissuris undecim parata ; squamae cinguliminutae, acute ovales, transversim striatae.Longit. 13 mm., diam. 19.The single specimen obtained is of a pale pinkish colour down the sides of the valves andwhitish flecked and spotted with greenish grey down the middle. The hinder almost straight edgeof the valves is pale with a few greenish grey spots and a dash of the same colour occurs alongthe sides in front of the lateral areas. The girdle is covered with alternate patches of greyishgreen and white scales. The insertion-plates of median valves have a single slit, that of the frontvalve has nine slits and that of the tail-valve eleven.281. Ischnochiton feliduensis, n. sp. (PI. XXXVI. figs. 11—14). VII.Testa ovata, mediocriter elata, in medio carinata, pallida, sordide alba; valvae tenuissimae,antica et areae laterales valvarum centralium minute granulatae ; areae centrales longitudinalitergrano-liratae ; valva anterior semicircularis, postice in medio sinuata ; mucro valvae posterioris antemedianus,parum prominens; cingulum album, squamis miuutis striatis ornatum. Longit. 6 mm.,diam.4 mm.Remarkable for the thinness of the valves, the flatness of the lateral areas, and its style ofsculpture. The posterior valve has twelve slits in the insertion plate, the anterior has nine andthe intermediate valves one.282. Ischnochiton maldivensis, n. sp. (PI. XXXVI. tigs. 7—10). VII.Testa elongato-ovata, elata, convexa, in medio subcarinata, pallida, plus minus rufescens, albominute punctata, cingulo minute squamulato griseo maculato circumdata ; valva antica et areaelaterales laeves, areae centrales sulcis paucis longitudinalibus utrinque sculptis, valva posterior inmedio mucronata ; squamae cinguli minutae, adamantiformes, indistincte striatae.Longit. 8 mm., diam. 4.The salient features of this species are the smoothness of the head-valve and the lateral areas,and the distinct incised lines upon the sides of the central areas, a space down the middle of