386 SIR C. ELIOT OX XUDIBRANCHS [Mar. 1, 



Europe is not found north of the Mediterranean. In the Pacific 

 it extends to Japan and Puget Sound. 



1. Chromodoris reticulata Pease. (Plate XXIII. figs. 1-5.) 



[See Bergh, " Neue Nacktschnecken, N'o. iv.," Jour. Mus. 

 Godeffroy, Heft xiv. p. 9 flf.] 



Four specimens, found at difierent times on both the East and 

 West Coasts of Zanzibar at low tide. 



The colour and size vary considerably. The following is the 

 descri};)tion of one living specimen : — " 23 millimetres long, 

 12 wide. Foot narrow, with the sides crinkled. Mantle-edge 

 fairly ample and undulated. The whole animal very soft and 

 almost gelatinous. The dorsal surface whitish, with numerous 

 red reticulations, which became closer at the edge and formed a 

 red border. Outside this was a yellow border, passing over to the 

 underside. The rhinophore and branchial openings were not 

 raised. The rhinophores were crimson-lake, with fine white lines 

 on the perfoliations. The branchiae were of a transparent light 

 pink, with two lines of crimson-lake down the main axis. The 

 under surface of the animal was of a beautiful opaque white 

 The foot projected behind the mantle." 



Another specimen (67 millimetres long and 30 broad) was 

 described as much lighter than that just noticed, but having 

 similar lines and I'eticulations ; there was no crimson-lake and no 

 red border ; all the red and yellow markings were bright and light. 

 It was infested w4th violet-coloured copepoda. 



On the other hand, two other specimens were of a much 

 darker colour. The general efiect was reddish brown, due to a 

 close reticulation of that shade on a dirty -white ground. The 

 mantle-border was a dark reddish orange. The gills were of a 

 very deep colour, and in one specimen almost black. The pinnae 

 were so thick and swollen that until closely examined each plume 

 appeared to be a simple column. 



The alcoholic specimens are flat, smooth, and very soft. The 

 branchial openings are fairly large, but in the living animal were 

 capable of contracting and almost closing. The branchiae are 22 

 to 24 in number, set in an incomplete circle with the ends turned 

 inwards in a spiral (PI. XXIII. figs. 2 & 3). The front plumes are 

 long and slender, while those behind in the spii"al are very small. 

 Hence on a superficial examination only 10 or 12 are visible. 

 The foot is rounded and grooved anteriorly, and the upper lamina 

 is connected with the sides of the mouth (PI. XXIII. fig. 1). 

 Near the points of junction appear to be two indistinct retracted 

 tentacles. 



The labial armature is a dense mass of long rods, slightly 

 curved and bifid at the end. On the rhachis of the radula * are 

 transparent lozenge-shaped thickenings. The innermost teeth 



* Only one preparation of the radula has been preserved from one of the darker 

 specimens. 



[8] 



