ELIOT : BRITISH NUDIBEANCHS. 241 



line runs down the centre of the back, also accompanied by spots and 

 sending off rather irregular branches to the lateral papillae. There 

 are six of these papillae, besides the frontal pair. The rhinophores 

 are quite smooth. 



The largest specimen is bent, and measures 12 mm. from head to 

 tail, equivalent to at least 15 mm. if it were straightened out. The 

 largest papillae are 6 mm. high, and the width, measured across from 

 the outermost tips on one side to the other, only 5 mm. The radula 

 consists of 50 rows. The central teeth bear four denticles, on each 

 side of which the fourth is smaller but rarely absent. 



The other characters are as in the St. Andrews specimen. These 

 latter differ from the typical form in having a different coloration 

 (as preserved), larger and more elaborately ramified cerata, and only 

 three denticles on the central tooth. Provisionally I describe them 

 as merely a variety, arborescens, as it is impossible to be cei'tain of the 

 colour in the living animal ; the development of the cerata is merely 

 a matter of degree, and the number of denticles may prove not to be 

 constant. Bergh describes them as varying from two to four. But 

 if the three characters given above are found to be constant and 

 concomitant, they warrant the creation of a new species. 



II. Staueodoris maculata (Garstang). 



Doris maculata, Garstang: J. Mar. Biol. Assoc, vol. iv, p. 167 (1896). 

 ? = Staiirodoris pseudoverrucosa, v. Ihering : Jahrb. deutsch. Malac. 



Gesell., 1886, p. 233. 

 ? = Boris euhalia, Fischer : Journ. de Conch., 1872, p. 10. 



Through the kindness of Mr. Allen, Director of the Marine 

 Laboratory at Plymouth, I have been allowed to examine two fine 

 specimens of this interesting form, dredged north of the New Ground 

 buoy in June last. The measurements are as follows in millimetres : — 



The texture is rather stiff, and the colour uniform pale yellow. 

 There is no note as to the appearance of the living animals, but they 

 were presumably as described by Garstang, bright yellow with pui-ple 

 tubercles and ridges. 



The body is high and arched ; the mantle descends to the ground 

 all round, touching the edges of the foot. The back is covered with 

 a reticulate pattern formed of tubercles and ridges. The tubercles 

 are large knobs, sometimes rising into a kind of peak, but not clavate 

 or constricted at the base. They are connected, in all possible 

 directions, by ridges of varying elevation and distinctness, and the 

 rectangular fields thus formed are traversed by lower irregular ridges, 

 some of which show signs of developing incipient tubercles. The 

 arrangement of the main ridges and tubercles is not very regular, but 

 there are three fairly distinct rows down the middle of the back, and 

 at the sides two others less distinct. Outsi(^e all these rows are 



