ASPAU, Voss lea. 
Priate IV. 
Species 11. (Mus. Sowerby.) 
APLYSIA TRIGONA. Apl. testa parvd, corned, fuscd, sub- 
trigond, ventricosd ; apice rectiusculo, acuminatim 
producto, margine superiori recti, reflexo, ad ter- 
minum obtuse angulato ; labio externo recti, infra 
obliqué producto, margine dorsali versiis marginem 
inferiorem oblique declivi, margine inferiori 
brevi. 
Tue TRIGONAL ApLysiA. Shell small, horny, brown, 
subtrigonal, ventricose; apex rather straight, 
acuminately produced, upper margin straight, re- 
flected, obtusely angular at the end; outer lip 
straight, obliquely produced below ; dorsal margin 
obliquely sloped towards the lower margin, lower 
margin short. 
SowERBy. 
Hab. (2) 
This species resembles Aplysia punctata in colour, 

texture, and convexity, but differs from them in its 
triangular form. 

Species 12. (Fig. a, 6, Mus. Cuming in Brit.) 
ApLysia FimpriaTa. Api. testd oblongo-subquadrata, 
pallida, omnino concentricé strigatd, tenui, sub- 
ventricosd, ints tenuissimé testaced, apice pauld 
elevato, incurvo, vix calloso; margine superiort 
leviter excavato, ad terminum cuneato ; labio ea- 
terno rectitsculo, subquadrato, 
margine dorsali convexo, margine inferiori sub- 
ad terminum 
rotundo. 
THe rrInceD ApLysia. Shell 
pale, concentrically striped in every part, thin 
subventricose, very thinly testaceous within, apex 
a little elevated, incurved, scarcely callous, upper 
margin slightly excavated, cuneate at the end; 
outer lip rather straight, subquadrate at the end, 
dorsal margin convex, lower margin rounded. 
Apams and Reeve. MS. Cum. Coll. 
Hab. Siberia. 
oblong-subquadrate, 


Species 13. (Fig. a, 6, Mus. Sowerby.) 
APLYSIA HYALINA. Apl. testa rotunda, pellucidd, hyalina, 
ventricosa, tenuiter concentricé livatd ; dorso con- 
vexo, prope marginem unisuleato ; apice depresso, 
rotundo, incurvo, margine superior elevato, ad 
terminum rotundo ; labio externo convexo ; mur- 
gine dorsali convexo, reflewo, margine inferiori 
rotundo. 
THE HYALINE ApLysia. Shell round, pellucid, hyaline, 
thinly concentrically ridged; back 
convex, with a sulcus near the margin; apex 
ventricose, 
depressed, rounded, incurved ; margin 
elevated, rounded at the end; outer lip convex ; 
upper 
dorsal margin convex, reflected; lower margin 
round. 
SOWERBY. 
Hab. Port Jackson. 
A beautifully transparent, rounded, ventricose shell, 
much differing from other known species. 
Species 14. (Fig. a, 6, Mus. Cuming in Brit.) 
ApLysiA SANDVICHENSIS. Apl. oblique oblonga, arcuatd, 
eburned, verstis margines fusca, ints alba ; apice 
elevato, vix incurvo; margine superiori declivi, 
profundé excavato, ad terminum angulato, labio 
eaterno infra rotundatim producto ; margine dor- 
sali convexo, infra versis labiwm eaternum ineli- 
nato, late excavato. 
Tue Sanpwico Istanp AptysiA. Shell obliquely ob- 
long, 
white within, apex elevated, very little incurved ; 
upper margin sloped downwards, deeply excavated, 
angular at the end; outer lip roundly produced 
below; dorsal margin convex, inclined towards 
the outer lip below, widely excavated. 
SowWERBY. 
Hab. Shores of Sandwich Islands. 
arched, ivory, brown towards the edges, 
Much more arched than Aplysza tigrina. 
August, 1869. 
