NOTES ON SOME BRITISH NUDIBRANCHS. 339 



The buccal mass is elongate. In one part of the labial cuticle is 

 a mass of variously shaped spicules, which are apparently the remains 

 of a fragment of food embedded in the skin, and do not represent an 

 armature of the lips. The radula is colourless, with a maximum 

 formula of 40 x 45.0.45. The teeth are rather straight and only 

 slightly hamate. Towards the end of the rows the spike becomes 

 reduced and the base increases, with the result that the tooth resembles 

 a broad, clumsy hook. The two innermost teeth project into the rhachis, 

 and are lower than the rest, but not denticulate. 



The oesophagus is thin, and tlie salivary glands band-like. The 

 stomach lies in an upper anterior cleft of the liver, but is separate from 

 it. Its walls are thickish, with a strong irregular lamination. The 

 genitalia seem to be as in the typical form. The light-grey hermaphro- 

 dite gland is spread over the greenish liver. The spermatotheca is 

 large and spherical ; the spermatocyst much smaller and elliptical. No 

 armature was found. 



I have compared this animal with specimens of aS'^. verrucosa from the 

 Mediterranean. It is lighter in colour, very much softer in consistency, 

 and the tubercles are lower and, as a rule, not clavate. But these are 

 all matters of degree, and I do not think a new species can be created 

 on the evidence of a single specimen. 



The present specimen is superficially quite unlike St. macnlata 

 (Garstang), which is very convex, hard, and bears a pattern of knob.s 

 connected by ridges. 



AKCHIDORIS TESTUDINARIA (A. & H.). 



[Doris testudinaria, Alder and Hancock, Ann. and Mag. U. N., 1862, 

 vol. X., 3rd series, p. 261. 



? Doris testudinaria, Risso. Hist. Nat. de VEiir. Mer., iv., 1826, p. 33. 



Archidoris stellifera, H. von Jhering. See Vayssieke, Journal de 

 Conchyl, vol. lii. No. 2, 1904, p. 123. Id. Opist. de Marseille Supp., 

 p. 82, 1903. 



Doris testudinaria. Jeffrey's British Conchologi/, vol. v. p. 85 (written 

 by Alder, as stated on p. 27).] 



Both the nomenclature and the specific limits of this form present 

 many difhculties, and it is with great dilhdence that ! submit it should 

 be called Archidoris testudinaria, that it is identical with the Arc/iidoris 

 stellifera of Vayssiere and von Jhering, and that it is probably distinct 

 from the Doris planata of Alder and Hancock. Two points, however, 

 seem certain : lirst, that the specimens from Plymouth here described 

 are the Doris testudinaria of Alder and Hancock ; second, that they are 

 distinct from Archidoris tuberculata, with which they are often con- 

 founded in practice. 



