1903.] FJIOM EAST AFRICA AND ZANZIBAR. 251 



rhinophore-pockets and tlie anal papilla project ; the edges are 

 smooth. In the preserved specimen the rhinophores are grey. 



Tlie branchipe are ai'ranged in a circuit interi'upted only by the 

 head and genital papilla. They vary in size, bvit though in places 

 long and shoi't branchife 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 miUim. broad at the base. They are not dii-ected 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 order, and though it is suctoi-ial is hardly porifoi-m. Though 

 the animal was dissected only three months after capture, the 

 internal organs wei'e already much dried and shrivelled, the spirit 

 having apparently been unable to penetrate the hai-d 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 lai'ger 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 spermatothec?e, one white and empty 

 and the other black and full, wei-e 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 pi-obable that 

 the species possesses these family chai'acteristics. 



In virtue of its buccal apparatus this animal belongs to Bergh's 

 genus Phyllidiopsis, although the tentacles ai'e not attached 

 through their whole length and are rather largei' than is usual in 

 the Phyllidiadse. It is remai'kable that the genus Phyllidiopsis 

 contains one species. Ph. papilligera, which has also black papillse 

 on the back. To me, the presence of these doisal papillse seems a 

 peculiarity sufficiently marked to merit generic rank. If Echino- 

 doris is a genus, why should not Phyllidiadse which have the same 

 peculiarity enjoy the same distinction ? I would propose to call 

 the genus Ceratophyllidia, and its characters will be : — Back 

 studded with papillce ; buccal apparatus in the known sjjecies 

 similar to that q/" Phyllidiopsis. 



Pleurophyllidiella horatii, gen. et sp. nov. 



One specimen from Wasin, East Africa. Mr. Orossland, who 

 captured it, gives the following notes on the living animal :— 

 " Three inches long. Mantle edged with light salmon-colour ; it 



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