310 



TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



Nm.Ch. = Neuropodial chastse. 

 Nm.Cirr. = Neuropodial cirrus. 

 N.O. = External opening of 



nephridium. 

 Not. = Notopodium. 

 Not.Cirr. = Notopodial cirrus. 

 Not.Pr. = Protractors of Not.S. 

 Not.Retr. = Retractors of Not.S. 

 Not.S. = Notopodial setse. 

 Nph.F. = Funnel of nephridium. 

 Nph.F.D. = Dorsal lip of do. 

 Nph.F. V. = Ventral lip of do. 

 Npile. = Neuropile. 

 N.S. = Nervous sheath of otocyst. 

 Nuc.Or. = Nuchal groove. 

 Nuc.Retr. = Eetractors of nuchal 

 organ (and of prostoniium) . 

 N.V. = Neural vessel. 



CE. = (Esophagus. 



CE. Conn. = (Esophageal connec- 

 tive. 



CE.Gl. = (Esophageal gland. 



CE.Gl.V. = Blood vessel of do. 



CE.Lat. = Lateral oesophageal 

 vessel. 



Ot. = Otocyst. 



Otl. = Otolith. 



Ot.N. = Nerve to otocyst. 



Ot.T. = Otocyst tube to exterior. 



Par.V. = Parietal vessel. 



P.B. = Polar bodies. 



Per. = Peristomium. 



Per.Cirr. = Peristomial cirrus. 



Per.C. = Peritoneal cell. 



Ph. = Pharynx. 



Pigm. = Pigment. 



Post.L.= Posterior lobe of brain. 



Proc. = Process of giant cell. 



Pr.Pr. = Protoplasmic processes 



of nephrostome. 

 Prost. = Prostomium. 

 Prost.Epith. = Prostomial epithe- 

 lium. 

 S.C. = Sense cell. 

 S.H. = Sense hairs. 



Sp. = Spicule (as otolith). 

 Sp>-N. = Spinal nerve. 



Stom. = Stomodceum. 



S.V. = Subintestinal vessel. 



T. — Tail of spermatozoon. 



Tent. = Tentacle (prostomial). 



TJ.L. = " Upper lip " (part of 

 peristomium) . 



V. = Ventricle of heart. 



Ves. = Vesicle of nephridium. 



V.Gr. = Ventral ciliated groove. 



V.M. = Vitelline membrane. 



V.V. = Ventral vessel. 



All the figures are drawn from Arenicola marina, 

 except figs. 7, 8, 9, which are of Nereis jjdagica, fig. 53 of 

 A. grtibii, and figs. 69-79 of A. claparedii. 



Plate I. 



Fig. 1. A Laminarian specimen, 190 mm. long, from 



right side. Proboscis fully protruded ; the buccal portion 



first protruded during eversion is provided with numerous 



backwardly directed papillae, the following pharyngeal 



