1903.] FROM EAST AFRICA AXD ZANZIBAR. 377 



21, Platydoris ellioti (?) (A. & H.). 



[Alder &. Hancock, " Notes on a Coll. of Nud. Moll, made in 

 India," Tr. Z. S. iii. 1864, p. 116.] 



One specimen from Wasin, dredged in 10 fathoms. 



The notes on the living animal describe the dorsal sui-face as 

 being on the whole of a reddish brown, very beautifully mottled 

 with vai'ious shades of sandy colour, the visceral mass being darker 

 than the rest. The under surface was white : just outside the edge 

 of the foot was a row of dark brown spots, and nearer the mantle- 

 edge a bright orange border foi'med of spots set near together. 



The alcoholic specimen measures 6'4 centimetres in length, 4*4 

 in breadth, and 2'4 in height. Like PL scabra, it is hard and 

 rough. The colour is a mottled pattern of white, a sandy tint, 

 and reddish brown. Beneath, the sides of the foot and the 

 adjacent parts of the broad mantle, which is 2*2 centimetres wide, 

 are thickly spotted with chocolate marks arranged so as to give 

 the impression of a continuous band. Seventeen chocolate spots 

 are irregulaily ari-anged round the foot on a yellowish gi-ound ; 

 then comes a fainter band also composed of chocolate spots ; then 

 a yellowish border extending to the mantle-edge. The foot is long 

 and narrow, grooved and notched in front but not deeply. The 

 rhinophore-pockets are closed by six projections. The branchial 

 opening is also six-lobed, the anterior and posterior lobes being 

 larger than the others, as in Fl, eurychlamTjs and scabra. The 

 branchia3 are six, tripinnate, not very large. The oral tentacles 

 are much retracted, white and conical. The buccal mass is large 

 and muscular, the labial cuticle vei-y strong but unai-med. The 

 radula about 40 x 70.0.70 ; the teeth yellowish, simply hamate, 

 the outermost smaller but not much degi'aded. The stomach is 

 large and free, strongly laminated in parts ; it appeared to contain 

 sand, as well as alimentaiy matter. The penis is armed with two 

 I'ows of hook-beaiing scales of the usual type, but set very close 

 together, each fitting into the next ; the vagina with lumps but 

 no scales. 



I feel somewhat doubtful whether this animal should be called 

 Fl. ellioti. Neither my specimen nor those described by A. & H. 

 present any very definitely distinguishing charactei-s. But, on the 

 other hand, there is no feature of importance which militates 

 against the identification, and the colours (which A. & H. record 

 as varying) are sufiiciently alike. 



22. Platyboris fulcra, sp. n. 



Two specimens from the neighbourhood of Wasin, dredged in 

 10 fathoms. 



The living animal was of a beautiful orange-red, covered closely 

 with minute lighter spots. Round the mantle was a border of dull 

 white containing purplish-black spots and small specks in one 

 specimen, and in the other dull violet spots. The under sui-face 

 is desci-iljed in the notes on living specimens as of uniform lighter 

 orange, but in the alcoholic specimens there is a rim of faint 



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