EI.IOT : NUDIBRANCHS FROM THE IM)0-Py\t:iFIC. 249 



smaller ones are set in a circle round each of them, but there are 

 others scattered between these figures, and the pattern is not very 

 conspicuous or symmetrical. On the under side of the mantle 

 margin, just to the left of the tail, are two spherical glandular bodies, 

 with a diameter of about 2 mm. The foot is distinctly grooved in 

 front, with projecting corners. The oral tentacles are retracted. The 

 sheaths of the rhinophores are slightly raised. The edge of the 

 branchial pocket is also slightly raised and turned outwards. The 

 branchiae are ten, simply pinnate. The anal papilla is central, and 

 rather large. 



The labial armature is faint, composed of bifid rods, set so as to 

 make a tessellated pavement. The radula is small, colourless, and 

 crowded. The teeth are erect, with two prongs at the top, and 4-6 

 denticles below ; the outermost are lower than the others, and irregu- 

 larly serrate at the top ; the innermost have an accessory denticle on 

 the side nearer the rhachis, but I did not see more than one such 

 denticle. 



Chromodoris pusilla Bergh. (PI, V., fig. 6). 



Bergh, y^;/^;-;/. Mas. Godeffroy, vi., 1874, pi. i, figs. 18-20; Id., 

 Notes Leyden Miis., vol. 9, 1887, p. 309, foot-note. 



One specimen from Muskat. It is solidly built, being 19 mm. long, 

 6.5 mm. broad, and 6 mm. high. The colour is uniform greyish drab 

 with five narrow stripes on the back. The inside of these stripes is only 

 a little deeper than the rest of the ground colour, but the edges are 

 bordered by darker lines. The medium stripe runs from the branchire 

 to the rhinophores. The two outermost form an ellipse passing round 

 the rhinophores and touching the sides of the branchial pocket, but 

 not extending behind it; the remaining two lines are intermediate and 

 join this ellipse at the pockets of the rhinophores and branchiae. It 

 would appear from the sketch and notes on the living animals that the 

 original coloration was white and bright scarlet. 



The back is flat and quite smooth. The foot is grooved in front 

 and projects behind. The branchial and rhinophorial pockets are 

 very slightly raised. There is hardly any mantle margin at the sides, 

 and even over the head and tail it is narrow. The branchiae are 

 twelve and set in a complete circle. 



The labial armature is yellow and continuous but divided into two 

 halves by a deep groove. The elements are shaped like short hooks 

 or maces and form a very elegant mosaic. The radula consists of 

 sixty-nine rows of yellowish teeth, of which there are at most fifty-five 

 on either side of the rhachis. The teeth are bifid and bear usually 

 four but occasionally five to six denticles below the bifurcation. The 

 prongs of this bifurcation and the upper denticles are rather loiig and 



