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Show 1904.] FROM EAST AFRICA AND ZANZIBAR. 89 various organs are fresh and strong, whereas in other cases they s m a l l " P " S**-, small spmes of very variable sh apTeh, es Vimelpglee , biafridm aendd w tirtihfid. From the genital mass to the tail extends on each side a long, ramified, almost arborescent gland, distinctly visible through the trans-parent body-wall with which it is united. T r e v e l y a n a bicolor (?). (Plate IV. figs. 1 a -1 c.) [A. & H , Notes on a Coll. of Nud. Moll, made in India, p. 132, pi. xxix. figs. 11, 12.] ' The single specimen, which was captured at Prison Island, Zanzibar was 20_ millimetres long, with a very long narrow foot, tapering to a point posteriorly. The whole animal was white, with projecting spots of bright yellow. The tips of the rhinophores and edges of the gills were also bright yellow. The liver showed through the dorsal integuments as a black mass before and behind the branchiae, and in front of it were seen the yellow reproductive organs. The branchiae were simple and leaf-like and shrunk together when touched. The preserved specimen is contracted into a spherical shape, showing no trace of the raised spots or of a mantle-margin. The head-parts are much retracted and distorted, but the anterior margin ^ of the foot seems to have been deeply grooved. The colour is white, but the black liver is still conspicuous. The twelve branchiae are set in a complete circle. The radula consists of 26 rows, the widest of which contain 24 closely packed teeth. The first lateral is large and hamate and the next much like it. The other teeth are rather stout, of the bradawl shape or slightly curved. In the pharynx were found the remains of a small tectibranch, which, to judge from its radula and stomach-plates, was probably Atys. I think this form is probably A. & H.'s T. bicolor. Their description was made from the drawing which they reproduce and they saw no specimen. The bicoloration there depicted was probably due to the liver being seen through the integuments, for though the picture certainly suggests a black patch on the skin, it will be seen that this patch occupies exactly the position of the liver, and that it bears yellow spots like the white part. It is also possible that Riippell and Leuckart's T. impudica is identical with this form. They describe it (Neue wirbellose Thiere des rothen Meers, p. 33) " corpore dilute lacteo; tentaculis superi-oribus, maculis ocellisque dorsalibus, branchiis pedisque limbo aurantiacis; dorso tuberculato ; branchiis 12 medium dorsi versus sitis; pallio indistincto." N embroth a B . [Bergh, S. R. xi. p. 450, figs., xvii. p. 980, figs. ; id. Beitr. zu einer Monographie der Polyceraden, ii. p. 658, figs., and iii. pp. 164-5.J This genus is allied to Trevelyana, but both internally and externally can be readily distinguished from it. The coloration is |
