70 TETHYS-EUROPEAN. 



NANT, B. Zool., iv, p. 35, pi. 21, f. 21. Aplysia depilans GMEL., Syst. 

 p. 3103. BANG, Hist. Nat. Aplys, p. 62, pi. 16, 17. VAYSSIERE, 

 Eech. Moll. Opistobr., p. 65, f. 51-58 (anatomy). BLOCHMANN, 

 Mittheil. Zool. Stat. Neapel, v, p. 32, pi. 3, f. 2, 5, 10 (anat.). 

 ZUCCARDI, Boll. Soc. Nat. in Napoli, (1), iv, p. 6, pi. 1, f. 1, 4, 10, 

 13, 15 ; pi. 2,f. 25-29 (teeth and jaws). WATSON, Challenger Gas- 

 trop., p. 673. MONTS., J. de Conchyl., 1877, p. 46. Tethys lima- 

 cina LINNE, Syst. Nat,, 10, p. 653, teste Linne*, S. N., 12, p. 1082. 

 ? Dolabella fragilis LAM., An. s. Vert., vi, 2me pt., p. 42 (1822). 

 ? Aplysia "major" LANKESTER, Philos. Trans., clxv, 1875, p. 13 

 (embryology). A. petersoni SOWB., Genera of Shells, Aplysia, fig. 

 1. ? Dolabella lavis BLAINV., Diet. Sc. Nat., xiii, p. 395. Aplisia 

 leporina DELLE CHIAJE, Memorie, pp. 28, 41, 71, pi. 2, 4,5 (1823). 

 Aplisia poliana DELLE CHIAJE, t. c., p. 30, 73, pi. 3, f. 1. A. poll 

 DELLE CHIAJE, t. c., p. 72. A. vulgaris BLAINV., Man. de Malacol., 

 p. 472, referring to Journ. de Phys., Vol. 96, fig. 8 (1825). 



The large orifice in the mantle over the shell, surrounded by 

 brown rays, and the posteriorly united swimming lobes are charac- 

 teristic. 



T. PUNCTATA Cuvier. Plate 30, figs. 1 to 11. 



Length 7-15 cm. but mostly smaller ; form about as in T. depi- 

 lans. Swimming lobes completely united behind as far forward as the 

 excurrent siphon, not very ample. Upper surface of mantle irides- 

 cent, with a large, oval orifice leading into shell-cavity ; edge with 

 purple glands as in T. leporina, and unicellular glands with granu- 

 lar contents, probably slime glands. Behind the genital open- 

 ing is a group of one-celled glands as in T. depilans. 



Color purplish-black, brownish or greenish- brown, always closely 

 spotted with pale rounded dots and small spots, which usually show 

 some opaque white specks. 



Alcoholic specimens (well preserved) are gray (produced by 

 minute ashy speckling on a clear ground) with pale spots, the lobes 

 darker, their inside edges with alternating dark and light bars, man- 

 tle brown. Occasionally all pigment is lost. 



Shell quite convex, pale yellow outside, ovate, the outer margin 

 hardly angular ; beak well incurved ; calcareous layer nearly coex- 

 tensive with the membranous, and moderately strong. 



Mediterranean and Adriatic Seas ; Atlantic from Norway and all 

 British coasts, to the Canaries. 



