9fi 



EXPLANATION ()¥ PLATES. 



Reference Letters. 



a. = Base of arm. 

 Oj = Arm tip. 

 an. = Anus. 



an. I. = Anal appendage. 



ap. int. = Opening of water canal. 



au. = Auricle. 



mi. v., aui Vi= Semilunar valves. 



A 1 — Artery of Br. filament. 



A 2 , A y , A A = Arms. 



.4 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. 



Ace. 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. Vise. G. — Pleural ganglia. 

 Arm. A. = Brachial artery. 

 Arm V v Arm F 2 . = Brachial veins. 

 And. caps. = Auditory capsule. 

 And. N. = Auditory nerve. 

 And. ves. = Auditory vesicle. 



b. = Degenerate ovum. 



b x = Muscles over Cranial Cartilage. 

 b. s. — Blood sinus. 

 Br. app. 3. v. r. = Brachial appendage. 

 Br. mem. = Branchial membrane. 



B. A. = Buccal artery. 

 B x Jkf, = Basal membrane. 

 B. M. — Buccal mass. 



B. N. = Buccal nerve. 



J5. 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. gld. = Branchial gland. 



Br. gld.V. = Vein of Bran, gland. 



Br. ht. = Branchial heart. 



Br. M. = Branchial muscle, attaching 



gill to mantle. 

 Br. N. = Brachial nerve. 

 Br. V. — Interbrachial vein. 



G. = Cuticular layer. 



C. A. = Cephalic artery. 



G. G. = Cerebral ganglion. 



0. N. S. = Central nervous system. 



C. S. = Cartilaginous Stylet. ' 



C. cell. = Cartilage cell. 



Ce. = Central tooth of radida. 



Ceph. V. — Cephalic vein. 



circ. m. = Circular muscle. 



Conjunct. = Conjunctiva. 



Cor. V. = Coronary veins. 



C. T. = Connective tissue. 

 Cr. C. — Cranial Cartilage. 



c. r. = Ridge betw. oviducal. apert. 



eh. = Chitinous lining. 



Chr. = Chromatophores in dermis. 



Gil. B. = Ciliary body. 



circ. lid. = Circular eyelid. 



Coel. — Pericardial coelom. 



coll. = Collar muscle. 



cr. = Crop. 



Cor. A. = Coronary artery. 



Cpdl. mass. = Cephalopedal mass. 



Cut. L. = Cuticular lining of oesophagus. 



depr. = Depression for spermatophores. 



D. = Dermis. 



D l = Dorsum of heart. 



D. M. and V. = Buccal nerve branches. 

 Du. = Salivary ductule. 



E. = Eye. 



Eff. A. = Efferent artery. 



egg. R. = Egg raceme. 



egg. st. = Egg stalk. 



emb. = Embryo. 



emb v = Part of oviduct. 



e. m. = Muscular septum. 



ep. = Epipodium. 



Ep. cell. = Epithelial cell. 



Ep. — Epidermis. 



Ep. S. = Stylet sac. 



Ex. C. L. = Ext. fibrous layer. 



Ext. = Ext. muse, of sucker. 



Ext. Muse. = Ext. muse, coat of eye. 



ext. or. — Ext. orifice of eye. 



/. = Foot. 



h, h> fi- = Folds of g' 11 fila ' t8 - 



/. ant. = Ant. funnel opening. 



/. el. = Closed funnel (inspiration). 



j.o. = Funnel organ. 



/. op. = Open Funnel (expiration). 



foil. = Follicular layer. 



