564., TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
EXPLANATION OF PLATES. 
REFERENCE LETTERS. 
a. = Base of arm. C, = Cuticular layer. 
a, = Arm tip. C. A. = Cephalic artery. 
an. = Anus. C. G. = Cerebral ganglion. 
an. l. = Anal appendage. 
ap. int. = Opening of water canal. 
au. = Auricle. 
aU. V., AU, vy= Semilunar valves. 
A, = Artery of Br. filament. 
A,, A;., A, = Arms. 
A and D. = Anterior and dorsal. 
~— A. D. = Adhesive disc. 
A. V. C. = Anterior Vena Cava. 
Abd. A. = Abdominal Aorta. 
Abd. V. = Abdominal Vein. 
Ac. Gl. = Accessory gland. 
Acc. Pall. N. = Access. Pallial nerve. 
Aff. v. = Afferent Branchial vessel. 
Ant. A. = Anterior Aorta. 
Ant. Fun. N. = Ant. Infundib. nerve. 
Ant. Sup. oph. = Ant. Sup. Ophth. 
nerve. 
Ant. V. N. = Nerve of Ant. Vena Cava. 
Ant. Visc. G. = Pleural ganglia. 
Arm. A. = Brachial artery. 
Arm V,, Arm V,. = Brachial veins. 
Aud. caps. = Auditory capsule. 
Aud. N. = Auditory nerve. 
Aud. ves. = Auditory vesicle. 
b. = Degenerate ovum. 
b, = Muscles over Cranial Cartilage. 
b. s. = Blocd sinus. 
Br. app. 3. v. r. = Brachial appendage. 
Br. mem. = Branchial membrane. 
B. A. = Buccal artery. 
B, M,= Basal membrane. 
B. M. = Buccal mass. 
B. N. = Buccal nerve. 
B. V. = Blood vessel. 
Bl. A. = Branchial artery. 
’ Bl. N. = Branchial nerve. 
Bl.g. = Branchial ganglion. 
Br. A. = Brachial artery. 
Br. app. = Pericardial gland. 
Br. G. = Brachial ganglion. 
Br. gid. = Branchial gland. 
Br. gld.V. = Vein of Bran. gland. 
Br. ht. = Branchial heart. 
Br. M. = Branchial muscle, attaching 
gill to mantle. 
= Brachial nerve. 
= Interbrachia: vein. 
Br. N. 
Bey 
C. N. S. = Central nervous system. 
C. 8S. = Cartilaginous Stylet. 
C. cell. = Cartilage cell. 
Ce. = Central tooth of radula. 
Ceph. V. = Cephalic vein. 
circ. m. = Circular muscle. 
Conjgunclt. = Conjunctiva. 
Cor. V. = Coronary veins. 
C. T. = Connective tissue. 
Cr. C. = Cranial Cartilage. 
c. 7. = Ridge betw. oviducal. apert. 
ch. = Chitinous lining. 
Chr. = Chromatophores in dermis. 
Cil. B. = Ciliary body. 
circ. lid. = Circular eyelid. 
Coel. = Pericardial coelom. 
coll. = Collar muscle. 
er. = Crop. 
Cor. A. = Coronary artery. 
Cpdl. mass. = Cephalopedal mass. 
Cut. L. =Cuticular lining of oesophagus. 
depr. = Depression for spermatophores. 
D. = Dermis. 
D, = Dorsum of heart. 
D. M. and V. = Buccal nerve branches. 
Du. = Salivary ductule. 
i. = Wye. 
Kf. A. = Efferent artery. 
egg. R. = Egg raceme. 
egg. st. = Kgg stalk. 
emb. = Embryo. 
emb,. = Part of oviduct. 
e. m. = Muscular septum. 
ep. = Epipodium. 
Ep. cell. = Epithelial cell. 
Hp. = Epidermis. 
Ep. S. = Stylet sac. 
Ex. C. L. = Ext. fibrous layer. 
Ext. = Ext. muse. of sucker. 
Ext. Musc. = Ext. muse. coat of eye. 
ext. or. = Ext. orifice of eye. 
j- = foot. ; 
hi fa fe. = Holds of oil ilar: 
j. ant. = Ant. funnel opening. 
f. cl. = Closed funnel (inspiration). 
f.o. = Funnel organ. 
f. op. = Open Funnel (expiration). 
foll. = Follicular layer. 
4 
