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Show 1 9 0 3 .] FROM EAST AFRICA AND ZANZIBAR. 2 5 1 rliinophore-pockets and the anal papilla project; the edges are smooth. In the preserved specimen the rhinophores are grey. The branchiae are arranged in a circuit interrupted only by the head and genital papilla. They vary in size, but though in places long and short branchiae seem to alternate, this cannot be said to be the general rule. Over the mouth are two tentacles each about 1'5 millim. long, and 1 millim. broad at the base. They are not directed sideways but straight forward, and being set close together so that the division is not visible, they appear to form a sort of head. They are united at their bases. The mouth is larger than is usual in this older, and though it is suctorial is hardly poriform. Though the animal was dissected only three months after capture, the internal organs were already much dried and shrivelled, the spirit having apparently been unable to penetrate the hard integument. It was clear, however, that the buccal organs are of the type of Phyllidiopsis rather than Phyllidia. The buccal opening led into a sausage-shaped tube about 6 millim. long and 2 millim. broad, with muscular walls transversely striped. This passed into a long, narrow, coiled tube, which preserved the same calibre until it dilated into the stomach. Two ample glands (salivary?) entered the larger part of the tube on either side, but were not in any way fused with it. The liver was large and undivided behind. The central nervous system was enclosed in a thin capsule and somewhat concentrated, the cerebral and pleural ganglia being hardly distinguishable and the pedal ganglia lying beneath them. The eyes were large, black, and distinct. The genital mass was much hardened, but the two spermatothecae, one white and empty and the other black and full, were quite distinct. It was impossible to ascertain whether the glans was armed with hooks and whether the folds on the dorsal wall of the pericardium (sometimes called the pericardial gill) were present, but it is highly probable that the species possesses these family characteristics. In virtue of its buccal apparatus this animal belongs to Bergh's genus Phyllidiopsis, although the tentacles are not attached through their whole length and are rather larger than is usual in the Phyllidiadae. It is remarkable that the genus Phyllidiopsis contains one species, Ph. papilligera, which has also black papillae on the back. To me, the presence of these dorsal papillae seems a peculiarity sufficiently marked to merit generic rank. If Echino-doris is a genus, why should not Phyllidiadae which have the same peculiarity enjoy the same distinction ? I would propose to call the genus Ceratophyllidia, and its characters will b e :-Back studded with papillae; buccal apparatus in the known species similar to that of Phyllidiopsis. P l e u r o p h y l l id ie l l a h o r a t i i , gen. et sp. nov. One specimen from Wasin, East Africa. Mr. Crossland, who captured it, gives the following notes on the living animal:- " Three inches long. Mantle edged with light salmon-colour; it |
