INCISIIRA (sCISSURELLA) LYTTELTONENSIS. 45 



19. Woodward, M.F. — "The Anatomy of Pleuvotomaria Beyrichii," 

 ' Quart. Journ. Micr. Sci./ 44, 1901. 



EXPLANATION OF PLATES 1—5, 



Illustrating Mr. Gilbert C. Bourne's paper "On the Anatomy 

 and Systematic Position of Incisura (Scissurella) 

 lytteltonensis.^' 



Lettering for all the Figures. 



An. Anus, a.y.f. Anterior gill- filaments, cm. I. Left auricle, au.r. 

 Right axiricle. B. Buccal ganglia, h. b. buccal bulb. b. c. Buccal 

 cavity, br. n. Branchial nerve, b. sJc. Branchial skeleton, b. v. Blood- 

 vessel. C. Cerebral ganglia, car. buccal cartilage, c. c. cerebral com- 

 missure, cil. Cilia, ctl. c. Ciliated canal of dorsal ridge of gill-filament. 

 ci'Z.Z. Lateral ciliated cells, c.pd. Cerebro-pedal connective, c. jjL Cerebro- 

 pleural connective, di. I. Left dialyneuroiis connection, d. g. r. Dorsal 

 glandular ridge of gill-filament, e. Eye. ep. Epipodium. ep. n. Epipodial 

 nerve, ep. f. Epipodial tentacle. -F. Foot. /. c. Frontal cilia. ^.Ganglion 

 behind mantle-slit. (/./.Gill-filaments. ^.??. Genital nerve, hij.g.l. Left 

 hypobranchial gland, hy. g. r. Right hypobranchial gland, i. Intestine. 

 i. V. Vertical loop of intestine, j. Jabot, jw. Jaws. 1c. I. Left kidney. 

 h. r. Right kidney. I. b. Left branchial ganglion, lb. I. Labial lobe. 

 I. c. Labial commissure. I. c. m. Left columellar muscle. I. ct. Left 

 ctenidium. li. Liver. li. d. Liver-ducts. I. ce. p. Left oesophageal 

 pouch. It. Lateral tooth of I'adula. m. Mouth, m. c. Mantle-cavity. 

 md. t. Medio-lateral teeth of radula. m. f. Median dorsal fold of buccal 

 cavity. m. s. Mantle-slit. mt. Mantle. 7i. Nucleus. od. Oviduct. 

 od. o. Opening of oviduct into right kidney, ce. (Esophagus, os. 

 Osphradium. ot. Otocysts. ov. Ovary. P. Pedal ganglia, pa. Pallial 

 nerve, pc. Pei-icardium. p.g-f- Posterior gill-filaments. 2^. gl. Pedal 

 gland, plig. Phagocytic cells of left kidney, pi. I. Left pleural ganglion. 

 pi. r. Right pleural ganglion, p. n. Pedal nerves, j). v. Pallial blood- 

 vessels. B. Rectum, r. b. Right branchial ganglion, r. c. m. Right 

 columellar muscle, r. ct. Right ctenidium. rd. Radula sac. r. ce. p. 

 Right oesophageal pouch, rp. d. Reno-pericardial duct. sb. i. Sub- 

 intestinal ganglion, sg.^ Anterior salivary glands. sg.^ Posterior 

 salivary glands, sn. Snout, s. o. t. Sub-ocular tentacle, sp. i. Supra- 

 intestinal ganglion, sp. I. Left symmetrical paUial nerve, sp. n. Supra- 

 intestinal nei"ve. sp. r. Right symmetrical pallial nerve, st. Stomach. 



