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Show 398 SIR 0. ELIOT OK XUDIKRAXCHS [Mar. 1, described markings fairly well preserved but all white. The form is high and stout. The tail projects 6 m m . behind. The mantle-edge is narrow and very thick : it measures about 3 m m . over the head and tail, and 2 m m . at the sides. The pockets of the rhinophores and branchiae are not at all raised. The front of the foot is rounded and grooved, the upper lamina being connected with the base of the tentacles ; but, as in many other cases, it is hard to be sure that this feature is not due to contraction. The labial armature consists of two yellowish plates composed of rather large elements of varying size. The most perfect form appears to be a short thick hook, but in many cases this degenerates into a simple triangle. The formula of the radula is about 65 x 70.0.70. The teeth are crowded over the small naked rhachis. They are of the bifid type, and have usually 3-5 denticles under the two prongs. These denticles are smaller in the inner half of the rows, where many teeth are quite smooth, and larger in the outer half. The innermost teeth have generally, but not always, a denticle on the inner side : the outermost are irregular and jagged. The buccal parts of this animal ally it to Chr. hilaris and Chr. carnea, and its coloration is not altogether dissimilar to the former. I think it is probably the Chr. magnified of Quoy and Gaimard, though identification is uncertain in the absence of information as to the radula of that species. 16. CHROMODORIS ixcoxsncuA. Chromodoris inconspicua Eliot, Abstr. P. Z. S. 1904, No. 4, p. 15, March 8. One specimen from Zanzibar Harbour, dredged in 5 fathoms. The living animal was translucent white, with numerous opaque white spots, and a few brown ones in the middle of the back ; tbe rhinophores black ; the gills greyish. It was stiff and sluggish, and somewhat resembled a Phyllidia. The alcoholic specimen is of a uniform grey, 18 mm. long, 7 broad, and 6 high. The mantle-edge is narrow all round, including the parts above the head and tail, and is somewhat undulated. The pockets of the rhinophores and branchiae have raised edges. The latter are small, 8 in number, and apparently set in a complete circle. The anterior end of the foot is slightly grooved. The tentacles are retracted. The labial armature is colourless, and consists of small thick hooks, sometimes bifid. The radula is also transparent. There are no rhachidial thickenings. The innermost teeth are unusually broad and square; they bear 8 denticles inside and 7 outside. The next two or three are also broader than the rest, which are slender, erect, slightly hamate, with one or sometimes two almost vertical clefts, so that they appear bifid or sometimes trifid. Below these clefts are from 3 to 5 long distinct denticles on the outer edge. The outermost teeth are tall and slender, with 3 or 4 denticles on the apex, but otherwise smooth. |
