ANATOMY AND CLASSIFICATION OF THE ARENICOLID^. 557 



1899. Fauvel, p. — 'Bull. Soc. Linneenne de Normandie,' series 5, vol. ii, 



fasc. 1, Caen, 1899. 

 1899 A. Tauvel, p. — 'Proc. Fourth Internat. Congress of Zoology,' held at 



Cambridge, 1898, p. 229, Lor.don, 1899. 

 1899. Lo Bianco, S.— 'Mitth. Zool. Stat. Neapel,' Band xiii, p. 484, 1899. 



EXPLANATION OF PLATES 22—29, 



Illustrating Messrs. F. W. Gamble and J. H. Aslivvorth's 

 Memoir on "The Anatomy and Classification of the 

 Areuicolidae." 



List op Reference Letters. 



A. Cr. Anterior cornu of brain. An. Anus. A)i. Fr. Fibrous portion of 

 anterior brain-lobes. Ant. Gang. Ganglionic portion of anterior brain-lobes. 

 Au. Auricle of the heart. Bl. Bladder of nephridium. B. Pap. Buccal 

 papillae. Br. Gills. Br. Aff. Afferent branchial vessels. Br. Eff. Efferent 

 branchial vessels. BR. Brain. B. S. Blood-spaces in tiie heart. B. Sh. 

 Sheath formed by buccal retractor muscles. B. V. Blood-vessel. Bucc. M. 

 Buccal mass. Cell. Gang. Ganglion cells of nerve-cord. Cenlr. Ceutrosome- 

 like body of giant-cell. Ch. L. Chitiiioid lining of otocyst. Chi. G. Chloro- 

 gogenous granules. C/il. Tiss. Chlorogogenous tissue. Coel. Ccelomic space. 

 Coel. Epith. Ccelomic epithelium. Conn.-tiss. Connective-tissue strands. C. P. 

 Cirriforni processes on the tail of A. cristata. C. Sp. Caudal septa. C.Str. 

 Strand of modified peritoneal cells on the first nephridium. D. L. V. Dorsal 

 longitudinal vessel. Dph. Ph. Diaphragmatic pouches. Djihm.^'^' Dia- 

 phragms. Endlh. Endothelium of heart-body. Epilh. Sec. Secreting cells of 

 the epidermis. FG. Yolk-granules. Fr. Fibrous part of the nerve- cord. 

 Gasi. Lai. Lateral gastric vessel. Gasl. V. Small gastric vessels. G. c. 

 Giant-cell. G. c. proc. Process of giant-cell. G. c. proc. fb. Branch of 

 process of giant-cell to fibrous part of nerve-cord. Gen. Sir. Genital strand 

 or gonad. G. F. Giant-fibre. G. f. lal. Lateral giant-fibre. G. f. m. 

 Median giant-fibre. G. F. Sh. Neuroglial sheath of giant-fibre. G. V. 

 Gonidial vessel. El. Heart. El. B. Heart -body. Int. Intestine. Int. V. 

 Intestinal vessels. Afel. Gr. Metastomial groove. Mid. Gang. Ganglion of 

 middle brain-lobe. Mo. Mouth. M. Pro. Protractor muscles of selfe. 

 M. Rel. Retractors of setse. N. Nucleus of giant-cell. N. Aff. Afferent 

 nephridial vessels. N. C. Nerve-cord. N. Eff. Efferent nephridial vessels. 

 N. form. Nucleus of cell from which the eye is formed. Nrgl. Neuroglia. 

 Ngl. flla. Neuroglial fibriilee. Ngl. Sh. Neuroglial sheath. Nllts. Neuro- 



