GENUS TESTACELLA. 3 
INTERNALLY, the most important peculiarity, as compared with the Liéma- 
cide, is the location of the heart! near the posterior extremity of the body, 
accompanied by a corresponding change in the position of the pulmonary 
cavity and anal aperture, the kidney and the shell, which are usually in rela- 
tion with it. As in Lima, the heart is anterior to the kidney, but occupies 
its right anterior corner, and the auricle is larger 
than the ventricle, and directed obliquely back- 
wards, the ventricle in front, in consonance with 
the altered course of the aortic trunks. 
The VISCERAL SAC is almost completely un- 
twisted, resulting in the pulmonary plexus being 
moved to the rear of the obliquely-placed heart, 
Testacella being thus opisthopneumonic; KIDNEY Te ea ert ts caer 
without secondary ureter;” SUPRA-PEDAL GLAND — hadiotidea, Bristol. x 5, showing 
long and sinuous, lying free on upper Sirface-of  ‘*2"4neement ofthe ganglia: 
the foot and extending almost to the posterior extremity of the body.* 
The Nervous System is chiefly centralized in a nerve ring, encircling the 
enormous lingual sheath, the closely contiguous CEREBRAL GANGLIA above it 
giving off lone and thick connectives to the pedal and visceral gangha which 
are fused together beneath ; the long cerebro-buccal connectives surround 
the esophagus, and the buccal ganglia are fused together or at least in con- 
tact, not separated by a longish commissure as is usual in the Limacidw. 
The onractory faculty is \ 
well developed and exhibited ~ 
as a large ganglion with ra- A 
mose terminations at the ar: 
apex of each of the posterior } 
tentacles or rhinophores.* 
Simroth also affirms that 
he has detected a double 
fringe of nerves of the same Fic. 2. Fic. 3. 
Peuece pqmenims (her pallial’ 22 thy ailamed chowing the gangliontc enlangetiene aud the 
chamber, aq relic of the prmi- Eee feemauions of the olfactory nerve. e eye with optic 
tive osphradium, The BYE Sees et te uitetrs organ or osphradium of 7. weauges 
1s small and black and the (after Simroth). 0.0. olfactory orifice ; 0.c. olfactory cavity ; 
vision feeble and myopic, the o.r, olfactory ridge ; 7.0. respiratory orifice ; 2.c. lung chamber. 
optic nerve, which shows scarcely any dilatation, separating from the nerve 
of olfaction quite at the base of the tentacles. 
The ALIMENTARY CANAL is simple, showing few flexures ; the MouTH very 
dilatable, its inner surface protected by a thick layer of chitin; the 
ODONTOPHORE large, beset with transverse, 
obliquely arcuate rows of slender, barbed 
and apically -pointed teeth, typical of 
Beloglossa ;? @SOPHAGUS short ; CROP volu- 
minous and muscular, functioning as the 
digestive sac, and held in position by a 
sheet of separate slender muscles, arising Fic. 4.—Alimentary canal of 7. haliotidea 
from the sides of the body, but most OP. course and an’ unusual development of 
conspicuous on the left side; the true _ the vestigial stomach. 
STOMACH is reduced to a small receptacle at first bend of gut near the open- 
ing of the bile ducts; INTESTINAL TRACT short, with but two tracts or 
Dichodromous.® 
1 Monnog. i., p. 293, f. 583. 2 Monog. i. p. 336, f. 626. 3 Monog. i., p. 314, f. 604. 
4 Monog. i., p. 226, f. 448. 5 Monog. 1., p. 267, f. 535. 6 Monog. i., p. 289, f. 568. 
ro 
