laj 



DESCRIPTIOX OF PLATES. 



Rp:rEE-E>;cE Letters. 



a. = Hepatic artery. 



.•1. add. = Adductor artery. 



A. c. = Circuiupallial artery. 



A. I. = 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 i)art of adductor. 



A. u. — Unstriped ditto. 



.4. V. = Visceral arteries. 



Al, Al'. Al". = Alveolus digest, gland. 



Al. c. \. = Oesophagus. 



Al. c. 2. = Storaach. 



A. I c. 2' = Ant. leftlat. depression, ditto. 

 Al. c. 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. J). = Posterior aorta. 



Arg. = Argentea. 



Aur. = Auricle. 



Aur'. = Wall ditto. 



Aur. C. = Transv. connect, ditto. 



Aiir. ex. = Excret. cells ditto. 



Aur. m. = jMuscles 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. = Atfer. branchial vein. 

 Br. off' . = Entrance to ditto. 

 Br. ax. = Ctenidial axis. 

 Br. d. = Descending lamella. 

 Br. eff. = Effer. branchial vein. 

 Br. j. I. = Interlamellar septum. 

 Br. m. = Long. nius. ctenidium. 

 Br. r. = Respir. expans'n jDrin. filam't. 

 Br. V. = Blood vessel of ditto. 

 G. jr. = Frontal cilia. 



C. I. = Lateral cilia. 



Ch. D. = Dark staining cliitin. 

 CJi. L. = Light staining chitin. 

 Com. = Cerebro-pleural comm. 

 Con. cp. = Cerebro-pedal conn. 

 Con. cv. = Cerebro-visceral conn. 



Cor. = Cornea. 



Cor. ps. = Pseudo cornea. 



Cris. = Crystall. style, cav. of intest. 



D. c. = Cell of Distal cell layer. 



D. c. I. = Distal cell layer. 



D. g. = Digest, gland duct. 

 Dg. = Digestive gland. 



E. = Eye. 



E. Mn. = Epith. of Mantle. 



E. St. = Eye stalk. 



Eos. = Eosinophil, cells. 



Ex. = Wandering excret. cell. 



F. = Foot. 



F. s. = Foot sucker. 



Fil. n. = Nerve of gill filament. 

 Fil. o. = Ordinary gill fil. 

 Fil. p. = Prin. gill fil. 

 Fil. Sep. — Intra-fil. septum. 



0. ant. = Ant. lobes of vise, ganglion. 



G. cb. = Cerebro-pleural gang. 



G. c. I. = Post, centr. lobes, vise. gang. 



G. lat. = Lat. lobes, vise. gang. 



G. Osp. = Osphradial ganglion. 



G. p. = Pedal ganglion. 



G. sp. = Visceral gangl. 



Ge. ep. = Germinal epith. 



Go. al. o. = Ovigerous alveolus. 



Go. al. s. = Seminal alveolus. 



Go. d. = Gonoduct. 



Go. o. = Ovigerous ]mrt of gonad. 



Go. s. = Seminal ])art of gonad. 



Gr. = Cxranular cells, digest, gland. 



1. = Iris. 



/m. c. o. = Outer interstit. cell. 



III. c. i. = Inner interstit. cell. 



L. = Lens. 



L. cl. = Leucocytic clumps. 



L. p. e .= R. ext. labial palp. 



L. p. i. = R. int. ditto. 



Lc. = Leucocytes. 



Lg. p. = Ligament pit. 



Lp. = Lips. 



Lp. I. = 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. 



iV. c. = Circumpallial nerve. 



N. I. = Nerves, labial palps. 



