AMP a bey -S: Te. 
PuateE II. 
Species 4. (Fig. a, b, c, Mus. Brit.) 
Ap.ysta Peterson. Apl. testé subquadrata, pland, 
nitenti, radiatim in areas latas complanatas per 
canales leviter foveolatos divisa, postice leviter 
rugata, intus tenuiter testaced, pallidissimé rosed, 
extits corned flavescenti ; apice calloso, incurvo, 
subcristato ; margine superior: excawato, reflexo ad 
terminum rotundo; labio externo rectiusculo, 
margine dorsali arcuato, ad apicem reflexo. 
Pererson’s Aptysta. Shell subquadrate, flat, shining, 
radiately divided into broad flat areas by slightly 
pitted canals, posteriorly slightly wrinkled, within 
thinly testaceous, very pale pink, without yel- 
lowish, horny; apex callous, incurved, slightly 
crested, upper margin excavated, reflected, 
rounded at the end; outer lip rather straight, 
dorsal margin arched, reflected at the apex. 
Sowersy. Genera of Shells, No. 32. 
Hab. Mediterranean, 
Much broader and more quadrate than the true 
Aplysia depilans, with which the shell has been con- 
founded. 

Species 5. (Mus. Sowerby.) 
APLYSIA TIGRINA. Apl. testd oblonga, subtrigond, tenui, 
pallida, obliqud, dolabriformi, arcuatd, tumida, 
prope umbones sinuatim strigatd, intiis tenwissime 
testaced ; apice elevato, incurvo, minute calloso, 
late reflexo; margine superiori declivi, excavato, 
ad terminum rotundo, labio externo anticé sinuatim 
producto, margine dorsali oblique arcuato, leviter 
excavato. 

THE TIGRINE Aptysta. Shell oblong, thin, subtrigonal, 
pale, oblique, hatchet-shaped, arched, tumid, 
sinuously striped near the umboes, within thinly 
testaceous; apex elevated, incurved, with a small 
callus, widely reflected; upper margin sloped 
downwards, arched, excavated, rounded at the 
end; outer lip anteriorly sinuously produced, 
dorsal margin obliquely arched, excavated. 
Rana. Hist. Nat. Aplys., p. 57, pl. 11. 
Dolabella fragilis. 
Hab, Port Jackson, 
The lower part of the dorsal margin, corresponding 
with the canal in spiral shells, is much excavated. This 
is the species to which was first applied by Pline the 
name of Lepus marinus, or Sea-Hare. 
Lamarck. 

Species 6. (a, 6, Mus, Jeffreys, et Brit.) 
APLYSIA DEPILANS.—Apl. testa oblonga, ovata, levigatd, 
nitenti, radiatim leviter sulcatd, intis testaced ; 
apice incurvo, reflexo, subcalloso ; margine superiors 
excavato, prope apicem reflexo, ad terminum 
cuneato ; labio externo subconvexo ; margine dor- 
sali convexo ; margine inferiori vix excavato. 
Tue BALD AptysiA. Shell oblong, ovate, smooth, shining, 
radiately lightly grooved, testaceous within; apex 
incurved, reflected, slightly callous; upper margin 
excavated, reflected near the apex, cuneate 
at the end; outer lip slightly convex; dorsal 
margin convex; lower margin scarcely excavated. 
Linnezvs. Systema Nature. 
Aplysia leporina. Delle Chaige. 
Hab. Mediterranean. 
More oval and narrower than Aplysia Peterson». 
August, 1869. 
