230 
Nm.Ch. = Neuropodial cheetie. 
Nm.Cirr. = Neuropodial cirrus. 
N.O. = External opening of 
nephridium. 
Not. = Notopodimn. 
Not.Curr. = Notopodial cirrus. 
Not.Pr. = Protractors of Not.sS. 
Not. Retr. = Retractors of Not.s. 
Not.S. = Notopodial sete. 
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.Gr. = Nuchal groove. 
Nuc. fetr.= Retractors of nuchal 
organ (and of prostomium). 
N.V. = Neural vessel. 
(i, = CGisophagus. 
(. Conn. = Cisophageal connec- 
tive. 
G.Gl. = Gisophageal gland. 
G.G1.V. = Blood vessel of do. 
@.Lat. = 
vessel. 
Ot. = Otocyst. 
Otl. = Otolith. 
Ot.N. = Nerve to otocyst. 
Lateral oesophageal 
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. 
Pignm. = 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. 
Sila = Sense hairs. 
Sp. = Spicule (as otolith). 
Sp.N. = Spinal nerve. 
Stom. = Stomodeum. 
S.V. = Subintestinal vessel. 
T. = Tail of.spermatozoon. 
Tent. = Tentacle (prostomial). 
U.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 Nercis pelagica, fig. 53 of 
A, grubu, and figs. 69-79 of A. clapared:?. 
Piate I. 
Hie 1: 
right side. 
A Laminarian specimen, 190 mm. long, from 
oo) 
Proboscis fully protruded ; the buceal portion 
first protruded during eversion is provided with numerous 
backwardly directed papillae, the following pharyngeal 
