206 Bulletin, Vanderbilt Marine Museum, Vol. IV 



jaws are figured by Zuccardi (1890). The embryology of depilans 

 was reported by Lankaster (1875). 



The shell of depilans is subquadrangular, convex, thin, nearly 

 opaque, composed of two layers, the outer layer corneous, pale amber, 

 membraneous, and the inner calcareous layer, which is decidedly 

 thicker than that of leporina and has a shining, light vitreous sur- 

 face, marked by growth lines and obsolete radial folds and grooves. 

 The spire is covered by an irregular callous, except in very young 

 adults. 



References: Lernaea (part) Bohadsch, de Quibusdam animalibus, 

 etc., pis. 1-3, 1761, Dresden (not available for examination). 



Laplysia depilans Linne, Syst. Nat., ed. XII, p. 1082, 1767. 



Aplysia depilans Gmelin, Syst. Nat., p. 3103. — Vayssiere, A., Rech. 

 Moll. Opistobr. Atlas d'Anat. Comp. Invert., Paris, p. 65, figs. 

 51-58, 1890 (not available for examination. Discusses anatomy). 

 — Blochmann, Mittheil. Zool. Stat. Neapel, vol. V, p. 32, pi. 3, 

 figs. 2, 5, 10, 1884 (Anatomy). — Zuccardi, Boll. Soc. Nat. in Napoli 

 (1), vol. IV, p. 6, pi. 1, figs. 1, 4, 10, 13, 15; pi. 2, figs. 25-29 

 (teeth and jaws figured). — Watson, Rept. Voy. "Challenger" 

 Zool., vol. XV, p. 672, 1886 (synonymy). — Mazzarelli, G., Mem. 

 Soc. Ital. Sci., 3rd series, vol. IX, p. 29, pi. 1, fig. 9, 1893 

 (Anatomy) . 



f Aplysia major Lankaster, Philos. Trans., vol. CLXV, p. 13, 1875 

 (Embryology). 



Aplisia leporina Delle Chiaje, Mem. Anim. Senza Vert., vol. I, p. 

 28, atlas, pi. II (not pi. XXXXI), 1823-29. 



Tethys depilans Tryon, Man. Conch., vol. XVI, p. 69, pi. 23, figs. 26, 

 27; pi. 24; pi. 33; fig. 25, 1895-96 (with extensive synonymy). 



Tethys fimbria (Bohadsch). 



Plate 130. 



Type : Not located ; original description not available. 



Distribution: Mediterranean: southern coast of France; coasts of 

 Italy and Sicily ; Baleares Isles ; coast of Algeria. 



Color: Semitranslucent milky white, with numerous irregular 

 splotches of black. 



Material examined: One very large specimen, Monaco, Mediter- 

 ranean, May 14, 1927. 



