FAUNISTIC NOTES. 107 



On Doris maculata, a new species of Nudibranchiate Mollusk 

 found at Plymouth. — Under the name Doris maculata, I describe a 

 small Dorid of striking appearance, which has been several times 

 obtained at Plymouth, and which seems to be quite distinct from any 

 form hitherto described. Pending the appearance of a more complete 

 account of the anatomy and affinities of this interesting form, the 

 present note will enable naturalists to recognise its appearance, and 

 to identify it in the event of additional specimens being found. A 

 brief reference to this animal occurs in my "Paunistic Notes at 

 Plymouth for 1893-94." {Jour. Mar. Biol. Assoc, vol. iii. 1894, p. 220.) 



The notffium of Doris maculata is usually about twice as long as 

 broad, the sides being approximately parallel, and the two extremities 

 equally rounded. The body, however, is flexible, and the actual form 

 of the animal varies accordingly at different times. The largest 

 specimen observed was nearly one inch in length, and proportionately 

 stout and broad ; but the usual length of the specimens obtained 

 varies from three-eighths to three-quarters of an inch. 



The rhinophores are large, distinctly laminated, and completely 

 retractile. The edge of the rhinophoral cavity is very slightly, if at 

 all, elevated, but is usually provided with a pair of purple tubercles 

 at its sides, one lying on the inner side, the other on the outer side 

 of the cavity. 



The circumanal gills are constantly five in number, and are so 

 situated that one gill is anterior and median in position, two others 

 form an antero-lateral pair, and the remaining two a postero-lateral 

 pair, symmetrically disposed with regard to the anus. The gills are 

 simple pinnate plumes, completely retractile within a cavity, and are 

 held out somewhat stiffly in expansion. The peribranchial fossa is 

 bounded by a thin raised lip, which is beset with a number of small 

 tubercles, some of which are pigmented with purple granules. 



The foot is broad, and, although concealed beneath the notteum when 

 the animal is at rest, projects slightly behind it during locomotion. 

 The anterior margin of the foot shows a transverse groove, which 

 separates a slender propodial lip from the rest of the foot. The 

 propodium is quite simple, and shews no trace of a division into two 

 lateral halves. 



On each side of the oral protuberance is an oral tentacle, whose 

 shape is bluntly conical, or digitiform, according to its state of 

 elongation. 



The feature which gives this new Doris its most distinctive appear- 

 ance is the presence, on the back, of a number of conspicuously coloured 

 tubercles, connected with one another by a network of low ridges. 

 These tubercles are of different sizes, and there is a good deal of 



NKW .SKKIES— VOL. IV. NO. 2. -^ 



