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) ; 
Réunion (Maillard). 
Aplysia maculata Rane, Hist. Nat. Aplys., p. 58, pl. 12, f. 6-9- 
—Krauss, Die Stidafrik. Moll., p. 71.—Desu., Moll. de Ile Ré- 
union, p. 54.—MAarreEns, in Mobius, Meeresfauna Maurit., ete., p. 
307.—Sows., Conch. Icon., f: 25 (false locality ; figs. copied).—? Ap- 
lysia spuria Krauss, l. ¢. 
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. PI. 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 l’Astrol. Zool., 11, p. 509, pl. 24, 
f. 5, 6—Marr., in Mobius’ Maurit., p. 807.—A. julianna Sows., 
Conch. Icon., f. 20.—A. julienna Gray. 
Described by Quoy & Gaimard from alcoholic specimens. 
T. r1gRINA Rang. PI. 16, figs. 3, 4; pl. 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. 
