108 TETHYS-INDIAN OCEAN. 



and thick. Color reddish outside and within. Length 16 mill. 

 (Rang.) 



Table Bay and Natal Coast, South Africa, on Fucus (Wahlberg) ; 

 Reunion (Maillard). 



Aplysia maculata RANG, Hist. Nat. Aplys., p. 58, pi. 12, f. 6-9- 

 KRAUSS, Die Siidafrik. Moll, p. 71. DESK., Moll, de File Re- 

 union, p. 54. MARTENS, in Mobius, Meeresfauna Maurit., etc., p. 

 307. SOWB., Conch. Icon., f. 25 (false locality ; figs, copied).? Ap- 

 lysia spuria KRAUSS, I. c. 



The general form is about as usual, the back being swollen, both 

 ends lengthened, the tail rounded instead of acute. The eyes are 

 quite apparent. The shell is almost entirely corneous. 



T. JULIANA Quoy & Gaimard. PL 17, figs. 9, 10. 



Length 4 to 5 inches. Proportions normal, the foot moderately 

 projecting behind, the sole bearing a rounded disk or escutcheon 

 posteriorly. Tentacles unusually large, the labial lobes flattened. 

 Swimming lobes ample. Mantle with a perforation. 



Smooth, of a uniform dark green color. 



Shell broad, oval, very membranous, the spire small. 



Mauritius. 



Aplysia Juliana Q. & G., Voy. de 1'Astrol. Zool., ii, p. 309, pi. 24, 

 f. 5, 6. MART., in Mobius' Maurit., p. 307. A.julianna SOWB., 

 Conch. Icon., f. 20. A.julienna GRAY. 



Described by Quoy & Gaimard from alcoholic specimens. 



T. TIGRINA Rang. PL 16, figs. 3, 4 ; pi. 59, figs. 40, 41. 



Length 15 cm. Much swollen, rather short, acute behind. 

 Swimming lobes broad and quite long ; mantle oblong, with a little 

 conic tube ; excurrent siphon moderately long. Surface smooth. 



General color dark greenish, varied with markings of two kinds : 

 a coarse marbling of a very deep tint over the whole body, the man- 

 tle and the inner surfaces of the swimming lobes; assuming on this 

 last tract the appearance of a blackish net-work on a quite light 

 ground ; besides this there is a marking of very numerous small, 

 pale, rounded spots, variously grouped, over the outer surface and 

 in front of the mantle. 



Shell ovate-oblong, membranaceous, with no distinct calcareous 

 layer, somewhat concave, acute behind ; the sinus quite wide and 

 shallow. Color livid yellow outside. Length 33 mill. 



Mauritius. 



