64 COOKE : NOMENCLATURE OF BRITISH NUDIBRANCHIATA. 



tubercles are " inaequales," but they make them very distinctly so in 

 their illustration, while the comparatively inconspicuous nature of the 

 branchiae comes out equally in the pictures by both authors. There 

 appears to be some contradiction in the two descriptions of the 

 rhinophores, Miiller stating that the tentaculum is "simplex," while 

 Alder and Hancock observe that it is "beautifully laminated." The 

 explanation appears to lie in the fact that Miiller was not able to see 

 more than the apex or nipple of the rhinophore, which, as commonly 

 in the Doridce, is bare of lamellae. He expressly says " raro exse- 

 ritur tentaculum simplex, at vix ultra lineam." The coincidence of 

 description with regard to the mouth and head lobes is very remark- 

 able, for there is no other English Doris which in the least resembles 

 repanda in this respect. 



P. 88. Doris proxima, A. and H. — Dr. Jeffreys adds, in square 

 brackets, " Bornholm Isle, in the Baltic (Meyer and Miibius)." 

 The addition is unfortunate. All that M. and M. state 

 (Fai(7ia der Kieler Bucht, i, p. 70) is, that they placed speci- 

 mens of D. proxima in a tank reserved for animals found on 

 the coast of Bornholm, and that they did not seem to mind 

 the diminished salinity of the water. 

 P. 88. Doris muricata, Mlill. — The reference to O. F. MUller's 

 Zoologia Danica should be replaced by the earlier descrip- 

 tion in Zool. Dan. Prod., p. 229. 

 P. 89. Doris ulidiana, Thomps. — It does not appear to have 

 been stated by the author of the species, or by any subse- 

 quent writer, that Ulidia is an old Latin name for Ulster, 

 Ultonia being its more usual form. 

 P. 90. Doris bilamellata, L. — The reference to the 12th 

 edition of the " Systenia" must be replaced by the following : 

 Lirnax hilamellatus, Linne, Fauna Suec, ed. 2 (1761), p. 

 508, no. 2094. 

 P. 92. Doris sparsa, A. and H. — For "xviii, p. 294" read 



"xviii (1846), p. 293." 

 P. 93. Doris pilosa, Miill. — For "Miill. Zool. Dan., iii, p. 85, 

 f. 5-8" read " O. F. Muller, Zool. Dan., iii (1789), p. 7, pi. 

 85, f. 5-8." The date is important, since there is an earlier 

 edition (1779 — 84) of the Zoologia Danica. 

 P. 93. Doris quadrangulata, A. and H. — This is a most 

 remarkable blunder. In both the references given, A. and 

 H. describe Doris suhquadrata. No such species as quadr- 

 angulata was ever described by them. 



