1904.] FROM EAST AFRICA AND ZANZIBAR. 283'- 



perhaps, be concluded that the living animals were black and 

 green like ordinary individuals. As preserved, the back is black, 

 with brilliant white tubercles ; the under side gi^eyish yellow, the 

 rhinophores black, and the branchife greenish ; several black bands 

 run from the mantle-edge to the branchipe on the under side. The 

 tubercles are compound as in the ordinary form but more pro- 

 jecting, and show a few black depressions between the confluent 

 lumps. There are no borders or rings of tubercles round the 

 mantle, but both in the centre and round the margin the tubercles 

 are arranged in square or oblong figures. The buccal mass is 

 large and deep orange. The shape of the whole animal is much 

 broader thaii usual, being about 23 mm. long by 18 wide, but the 

 end of the foot and mantle are pointed. 



If this animal pioves to be sharply distinguished from 

 Ph. nobilis, it is no doubt a good sj)ecies, but it Avill probably be 

 found to be connected Avith the ordinary form by a series of links. 

 It bears a certain resemblance to Van Hasselt's figure of his. 

 Ph. verri(,Gosa (v. Bergh, " Die Van Hasselt'schen Nudibranchien," 

 Notes from the Leyden Museum, vol. ix. 1887, p. 313, and 

 plate 6. fig. 7), but does not coincide in detnils. 



Much the same may be said of another specimen in which the 

 tubercles were pink rather than green in life. The three borders 

 and central pattern are veiy regularly developed as in the typicfd 

 form described above, l)ut the raised parts are fused into flat, 

 smooth ridges, with hardly any indication of knobs. 



Phyllidia (Phyllidiella) rUSlTLOSA (Cuv.). 



[Bergh, Bidr. til en Monogr. p. 510 ft'.] 



I have only two specimens of this form, Avhich would hence 

 appear not to be very common on the East Coast of Africa. It is 

 more elongated than Ph. varicosa and 'iiobilis, the larger specimen 

 measuring 33 mm. in length and 11 in breadth. The colour of 

 the back is a very deep bright black with green tubercles. The 

 rhinophores and branchial lamella? are also deep black, but the 

 sides of the body, the foot, and the oral tentacles are slate- 

 coloui'ed. Many of the tubercles, especially in the centre of the 

 back, are compound, and are composed of two or three, rarely 

 four, partly fused togethei-. In the more regular of the two 

 specimens there are tln-ee borders of tubercles round the mantle- 

 edge, and three groups, composed of foui' compoiuid tubercles each, 

 down the centi'e of the back. These three gi'oups are sepai-ated 

 from one another by sti-aight transvei'se rows composed of three 

 tubercles each. In the other specimens, though the number and 

 character of the tubercles are nearly the same, the pattern is less. 

 regular, and the general impiession given is of five moderately 

 straight lines down the liack. The openings for the ihinophores 

 and anal papilla are rathei- large, and are placed not in tubercles 

 but on the flat surface of the back. The buccal mass is large ; 

 j)arts of it are yellow, but lielow and in front it is black. 



