146 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



Mediterranean and five from the West Indies. None appear to have 

 been found north of the Mediterranean. Compared with the Pacific 

 forms, these species are soberly coloured, the niajority being blue 

 or purplish, with white or yellow uiiirkings 



One small blue species was found in the Cape Verd Islands, and is 

 already known from the Mediterranean. 



Chromodoris gracilis (Delle Chiaje). 



Chromodoris gracilis (Delle Chiaje), vou Ihering : Malac. Blatt., 1880, 

 vol. ii, pp. 67-71. 



Mr. Crossland's notes are as follows : — 



" Chromodorii! (h\ue). In a nodule of Lithothamnion, 3 or 4 fathoms. 



"Of the typical shape, with narrow mantle, about an inch long, 

 foot projecting very little behind mantle. Colour deep blue, almost 

 black, except edges and anterior part of mantle which are bright blue. 

 Parallel to mantle-edge, a thin line of bright yellow. In centre of 

 back a long zigzag line of white, bearing club-shaped or semicircular 

 blotches of light blue laterally. This line is yellow between and 

 in front of the rhinophores. Foot blue-black above, lighter blue 

 below, with white and light blue blotches. Just below mantle a thin 

 bright yellow line. The whitish blotches are largest above, smaller 

 below, and are arranged in 3 rows. Formalin dissolves out a blue 

 solution. Gills 7 in a simple circle, hindmost pair rather smaller, 

 simply pinnate, completely retractile and not reappearing for some 

 time. The plumes are dark blue, with white tips, and white blotches 

 on outer side of rhachis. They spring from a blue-black base. 

 Rhinophores large, almost as high as the gills, black with white tips, 

 and a few white dots." 



The preserved specimens are of a uniform grey. The largest is 

 9 mm. long, 35 broad, and 4 mm. high. The mantle-edge is indistinct ; 

 the head and tentacles as usual in the genus. The branchial pocket is 

 not raised, and the plumes are completely retracted within it. The 

 foot is narrow. 



The labial armature is a fine yellowish mosaic of rods with bifid 

 tips. The radula consists of about 50 rows, with from 35 to 40 teeth 

 on each side of the naked rhachis. The arrangement of the teeth is 

 as usual in the genus. They are minute and deeply cleft at the top. 

 Under the cleft they bear a few (1-3) fine denticulations. There may 

 perhaps be as many as 5 denticulations, but they are hardly visible. 



In most points this specimen corresponds exactly with von Ihering's 

 description of C. gracilis, but the three yellow lines on the back are 

 replaced, according to Mr. Crossland's description, by one long " zigzag 

 line " of white and yellow. 



DORIDOPSIDJE. 



This family is divided by Bergh into the genera Doridopsis and 

 Doriopsilla. The former is numerous in species, and its known 

 distribution is much the same as that of Chromodoris. It is abundant 

 in the tropical Indo-Pacific, and the animals are often large and 



