SEA-FISHERIES LABORATORY. 463 
DESCRIPTION 
OF PLATES. 
REFERENCE LETTERS. 
a. = Hepatic artery. 
A. add. = Adductor artery. 
A, c. = Circumpallial artery. 
A. l, = Labial arteries. 
A. p. = Pedal artery. 
A. p. a. = Ant. pallial artery. 
A. p.p. = Post. pallial artery. 
A. r. = Rectal artery. 
A. s. = Striped part of adductor. 
A, u. = Unstriped ditto. 
A. v. = Visceral arteries. 
Al, Al’. 
Al. c. 1. = Oesophagus. 
Al. c. 2. = Stomach. 
A.ic. 2’ = Ant. left lat. depression, ditto. 
Al. ¢. 2” = Post. ditto. 
Al. c. 3. = Descend. loop of intestine. 
Al. c. 4. = Ascend. loop of intestine. 
Al. c. 5. = Rectum. 
An. = Anus. 
Ao. a. = Anterior aorta. 
Ao. p. = Posterior aorta. 
Arg. = Argentea. 
Aur. = Auricle. 
Aur’. = Wall ditto. 
Aur. C. = Transv. connect. ditto. 
Aur. ex. = Excret. cells ditto. 
Aur. m. = Muscles ditto. 
Ax. f. = Axial fibril of Rods. 
Bl. c. = Blood corpuscles. 
B. g. = Byssal Gland. 
B. g. c. = Byssus cells. 
Br. = Branchia. 
Br. a. = Ascending lamella of Branch. 
Br. a’. = Termination ditto. 
Br. aff. = Affer. branchial vein. 
Br. aff’. = Entrance to ditto. 
Br. ax. = Ctenidial axis. 
Br. d. = Descending lamella. 
Br. eff. = Effer. branchial vein. 
Br. j. l. = Interlamellar septum. 
Br. m. = Long. mus. ctenidium. 
tea) ee 
Br. v. = Blood vessel of ditto. 
C. fr. = Frontal cilia. 
C.1. = Lateral cilia. 
Ch. D. = Dark staining chitin. 
Ch. L. = Light staining chitin. 
Com. = Cerebro-pleural comm. 
Con. cp. = Cerebro-pedal conn. 
Con. cv. = Cerebro-visceral conn. 
Al", = Alveolus digest. gland. 
Respir. expans’n prin. filam’t. 
Cor. = Cornea. 
Cor. ps. = Pseudo cornea. 
Cris. = Crystall. style, cav. of intest. 
D. c. = Cell of Distal cell layer. 
D. c.l. = Distal cell layer. 
D. g. = Digest. gland duct. 
Dg. = Digestive gland. 
a Kye. 
. Mn. = Epith. of Mantle. 
H. st. = Kye stalk. 
Hos. = Kosinophil. cells. 
Hx. = Wandering excret. cell. 
Ff. = Foot. 
F. s. = Foot sucker. 
Fi. n. = Nerve of gill filament. 
Fil. o. = Ordinary gill fil. 
Fil. p. = Prin. gill fil. 
Fil. sep. = = Intra-fil. septum. 
G. ant. = Ant. lobes of vise. ganglion. 
G. cb. = Cerebro-pleural gang. 
G. c. l. = Post. centr. lobes, vise. gang. 
G. lat. = Lat. lobes, vise. gang. 
G. Osp. = Osphradial ganglion. 
G. p. = Pedal ganglion. 
G. sp. = Visceral gang]. 
Ge. ep. = Germinal epith. 
Go. al. o. = Ovigerous alveolus. 
Go. al. s. = Seminal alveolus. 
Go. d. = Gonoduct. 
Go. o. = Ovigerous part of gonad. 
Go. s. = Seminal part of gonad. 
Gr. = Granular cells, digest. gland. 
Ji es Lbeltsy 
In. c. o. = Outer interstit. cell. 
In. c. 1. = Inner interstit. cell. 
L. = Lens. 
L. cl. = Leucocytic clumps. 
L. p. e.= R. ext. labial palp. 
L. p. v. = RB. int. ditto. 
Le. = Leucocytes. 
Lg. p. = Ligament pit. 
Ep hips: 
Lp. l. = Lower lip. 
Lp. u. = Upper lip. 
M. = Mouth. 
Mn. = Mantle lobe. 
Mu. g. = Mucous glands, foot. 
Mu. g. c. = Compound ditto. 
N. br. = Ctenidial nerve. 
N.c. = Circumpallial nerve. 
N.l. = Nerves, labial palps. 
