AD RoE YES x". 
PuatE IX. 
Species 37. (Fig. a, 6, Mus. Sowerby.) 
APLYSIA QUADRATA. Api. testd parvd subquadratd com- 
pressd, hyalind, vix concavd, extiis pallidissimé 
cornea, concentricé eleganter undatd ; apice acumi- 
nato, minute calloso; margine dorsali convexo, 
margine superiort quadrato, excavato ; margine in- 
feriori versiis labium externum sursium acclivt. 
THE quaprate Aptysta. Shell small, subquadrate, 
compressed, hyaline, very slightly concave, with- 
horn, concentrically elegantly 
undated; apex acuminated, with a very small 
out very pale 
callus; dorsal margin convex, upper margin sub- 
quadrate, excavated; lower margin sloped up- 
wards towards the outer lip, 
Sowerby. Genera of Shells. 
Hab. Algiers. 
This beautiful little glassy shell resembles the fol- 
lowing species in some respects, but is smaller and more 
quadrate. 

Species 38. (Fig. a, b, Mus. Sowerby.) 
Aptysia simiuis. Apl. testd compressa, subovata hya- 
lind, subcompressd, paulo concavd, lateraliter arcuatd, 
extus pallidissime corned ; apice acunvinato, ele- 
vato vie calloso; margine superiort depresso, swb- 
excavato, ad terminum subquadrato ; labio externo 
convexo, antice oblique producto ; margine dorsali 
rectiusculo ; margine inferiori via excavato. 
SOWERBY, 
Hab, 

(?) 
More obliquely oval, more laterally curved, and less 
quadrate than Aplysia quadrata. 
Species 39. (Fig. a, b, Mus. Cuming in Brit.) 
APLYSIA SUBQUADRATA. Apl. testd subrhomboided, obliqua, 
ventricosd castaned, pellucida, levigata ; apice ele- 
vato, obtuso, incurvo ; margine superior declivi, 
brevt ; labio externo infra oblique producto ; mar- 
gine dorsali rectiusculo ; margine inferiort obliquo, 
lato. 

THE Shell subrhomboidal, 
oblique, ventricose, chestnut, pellucid, smooth; 
SUBQUADRATE APLYSIA. 
apex elevated, obtuse, incurved; upper margin 
sloped, short; outer lip obliquely produced below ; 
dorsal margin rather straight; lower margin 
oblique, wide. 
GouLp. 
Hab. United States. 
The shell of this species is not easily distinguished 
from that of the British and Mediterranean Aplysia 
hybrida. 

Species 40. (Mus. Cuming in Brit.) 
APLYSIA CORNIGERA. Apl. testd unguiformi, angustd, 
ovatd, arcuatd, concentrice strigata ; apice per- 
elevato, incurvo, acuminato, calloso; margime su- 
periort depresso, excavato, ad terminum obtuse 
angulato ; labio externo infra oblique sinuatim 
producto ; subacumi- 
nato ; margine dorsali rotundo, reflexo, radiatim, 
margine inferiort anticé 
unisulcato. 
HORN - BEARING 
narrow, ovate, arched, concentrically striped ; 
apex much elevated, acuminated, 
callous ; upper margin depressed, excavated, ob- 
tusely angular at the end; outer lip sinuously 
obliquely produced below ; lower margin a little 
acuminated in front; dorsal margin round, re- 
THE Apzysta. Shell talon - shaped, 
incurved, 
flected, with a radiating groove. 
SowErRBy. 
Hab. Island of Zebu, Philippines. 
The curved horn-like form and pointed apex dis- 
tinguish this prettily-striped shell. 
Species 41. (Fig. a, 6, c, Mus. Sowerby.) 
Aprysta puncTata, Apl. testa corned, castaned pellu- 
cida, convert, oblique ovata, laevigata ; apice pro- 
ducto, reflexo, incurvo, subcalloso, subauriculato ; 
margine superiori brevitisculo, eacavato, ad terminum 
obtuse angulato ; labio externo recti, infrd oblique 
August, 1869. 
