APLYSIA.—P tate X. 
THe uncuirerous Aptysia. Shell vitreous, pellucid, 
smooth, flat, a little arched; apex elevated, a 
little tortuous, callous; upper margin sloped 
downwards, rather straight, roundly angular at 
the end; outer lip straight; lower margin sloped 
upwards to the lip; dorsal margin straight, 
cuneate at the end. 
Rane. Hist. Nat. Aplys., p. 52, pl. 5, f. 4-7. 
Hab. Mediterranean. 
This shell and the following resemble the two 
vitreous species described as Aplysia quadrata and 
Aplysia similis, but do not appear to possess the same 
beautifully undulated sculpture. 

Species 48. (Fig. a, b.) (Copied.) 
Apl. testi vitreed, pellucida, 
compresstt, apice 
APLYSIA 
levigatd, 
PETALIFERA. 
arcuatd, elevato ; 

acuminato ; margine superiori declivi, ad termumum 
rotundo ; labio externo rectitisculo, ad terminum 
peroblusé angulato ; margine imferiori rectiisculo, 
versiis labiwm acclivi, margine dorsali superné 
convero. 
Tue PETALIFEROUS ApLysiIA. Shell vitreous, pellucid, 
smooth, compressed, arched; apex elevated, acu- 
minated; upper margin sloped, rounded at the 
end; outer lip rather straight, very obtusely an- 
gular at the end; lower margin rather straight, 
sloped up towards the lip; dorsal margin convex 
above. 
Rane. Hist. Nat. Aplys., p. 52, pl. 5, f. 2, 3. 
Hab. Mediterranean. 
This species and the preceding are placed by Rang 
among the Dolabrifera. 
