62 APLYSIID. 
In Phyllaplysia the teeth are tricuspid, denticles broad and ob- 
tuse (pl. 9, fig. 26, P. lafonti). 
In Notarchus the teeth are narrow with long cusps closely serrate 
or barbed on both inner and outer edges. 
The buccal mass (pl. 62, fig. 4, bm) is large and muscular, two 
much lengthened salivary glands (s. g.) enter it, one on each side of 
the long cesophagus. The stomach (s) consists of three portions: 
an anterior thin-walled sack, a median hard and muscular belt 
armed inside with pyramidal cartilaginous nodules for triturating 
the food, and following this a thin-walled portion containing inter- 
nally smaller nodules or spur-like appendages. This passes into the 
intestine (7), which is coiled about the large liver or digestive gland 
(d. gl.), the ducts of which, several in number, enter it near the 
point marked x. Becoming free from the liver, the intestine crosses 
the ovo-testis in a groove, and terminates externally at the base of 
the excurrent siphon (see pl. 62, fig. 4, Aclesia pleii Rang; pl. 9, 
fig. 15, Tethys punctata ; pl. 40, fig. 2, Notarchus punctatus Phil.). 
The genital system (pl. 62, figs. 1, 2, Aclesia plett Rang) consists 
of a hermaphrodite gland or ovo-testis (0. t.) which communicates 
spermatozoa and ova by a common duct, the small hermaphrodite 
duct (h. d.), to the “ annexed genital mass,” G. In this mass the 
hermaphrodite duct splits (fig. 3, div.): by one branch (the Cu- 
vierian duct, Cuv.), communicating with the spermatheca, sp., the 
other branch, oviduct, involved in a complex series of convolutions 
partly concealed in the annexed mass (fig. 3, diagrammatic, show- 
ing convolutions of oviduct [ov.], Cuvierian duct [ Cuv.] and sper- 
matheca |sp]). The middle of the annexed genital mass is com- 
posed of the albumen gland (a/d.), visible only on the lower surface 
of the mass. At the base of this mass is the spermatheca, sp. ; 
downward is the greater hermaphrodite passage (ghd), bearing be- 
low the globular Swammerdam’s vesicle (S. v.), which is functional 
as a reservoir of spermatozoa; and the female system ends below 
this in the external opening (0). Thence the male system continues 
as a groove or furrow in the integument passing forward to the 
vicinity of the right anterior tentacle, where the penis is situated. 
This organ (seen retracted in pl. 62, fig. 2, and extended in pl. 37, 
fig. 19) is grooved lengthwise, continuing the furrow just described, 
for the passage of spermatozoa. It is retracted by a muscle at- 
tached distally to the body wall (fig. 2, 7m.). 
