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

150 COLLECTIONS FROM MELANESIA.the body. Polian vesicle ? Length 85, 62 millim. ;greatest breadthIT'S, 17'5 millim.Port Jackson.Save in the complete absence of spicules this species would notappear to have any resemblance to the T. inermls of Heller, theshorter body of which, attenuated at both ends, is said to have avery thin integument and to be of a yellowish-grey colour.11. Thyonidium schmeltzii.Ludtvig, Semper^s Arbeiten, ii. p. 94.As there is only one specimen of this species, I have been obligedto content myself with an examination of the integuments, wherethe " morgensternahnliche Gebilde " were found iu abundance inthe outer layer.Warrior Reef, Torres Straits.Semper, Hoi. p. 244.Port MoUe.12. Orcula cucumiformis.13. Phyllophorus proteus. (Plate IX. figs. F, F'.)Body varying greatly in form, being saccular, swollen, or elongated; in the last case it is narrower behind than in front, andpretty regularly convex above. The integument, which is ratherthick, may be black, and the colour rendered more marked b)^ thelightness of the suckers, as there may be merel}' dark longitudinalbands, or the whole body may be greyish, and the only black spotsthe tips of the suckers. The suckers themselves always have awrinkled appearance, but no definite statement can be made as totheir arrangement on the body.The retractors are triangular in form and considerablj^ enlargedat their origin ; the buccal ring is well developed, the radial piecesbeing very large, and the interradial dagger-shaped ; both are ratherdeeply excavated above (fig. F'). The spicules in the suckers presentan appearance not unlike that seen in the zooglcea-stage of Bacteriumtermo ; the spicules of the integument are more or less foursided,four-chambered bodies, made up of somewhat delicate bars,forming a trellis-work.Port MoUe ; Clairmont and Thursday Islands ; Alert Island (7 fms.,sand).14. Stereoderma validum. (Plate IX. figs. E, a-f.)Body elongated, tapering more at its posterior than at its anteriorend ; the ventral surface a little convex, the dorsal concave. A