GEROULD: CAUDINA. 
EXPLANATION OF 
189 
PLATES. 
All the figures except 46, 67, 78, and 80 were made with the aid of a camera 
lucida, and all except 34-87, 53, 86, and 101 are from Caudina arenata Gould. 
Figures 54-57 are from C. arenata var. armata Théel. 
Figures 53, 86, and 101 are from Cucumaria frondosa. 
amp. 
ann. nN. 
aq. cre. 
aq. fT. 
ager! 
aq. ta. 
aq. ta.' 
can. lap. 
cle. 
cl. fol. 
cl. gn. 
cl. sns. 
cl. sst. 
cl. vag. 
cp. sph. 
cp. sph.' 
cta. 
dt. gen. 
en. cre. 
en. r. 
ABBREVIATIONS. 
Ampulla of tentacle. 
Nerve ring. 
Circular water canal. 
Radial water canal. 
Median-ventral radial 
water canal. 
Tentacular branch of ra- 
dial water canal. 
Tentacular branch of ra- 
dial water canal to me- 
dian-ventral tentacle. 
Stone canal. 
Cloaca. 
Follicular cell. 
Ganglionic cell. 
Sensory cell of epithe- 
lium. 
Supporting cell of epi- 
thelium. 
Wandering cell in pha- 
rynx. 
Spheruliferous wander- 
ing corpuscle. 
Spheruliferous corpuscle 
with finer spherules 
than ep. sph. 
Cuticula. 
Genital duct. 
Circular epineural canal. 
Radial epineural canal. 
en'th. 
eth. 
eth. buc. 
e’th. ex. 
eth. ex. oa. 
e’th. i. 
for. sst. 
gl. tbl. 
h’pn. r. 
lac. od. 
mad. 
m py. 
ms’ent. d. 
mu. 
mu. ere. 
mu. lg. 
mu. lg.! 
mu. lg. ta. 
Endothelium. 
Epithelium. 
Epithelium of the buccal 
region. 
External epithelium. 
External epithelium of 
the ovary. 
Internal epithelium. 
Supporting fibers of 
nerve bands. 
Tubular gland cell. 
Hyponeural canal. 
Lacunar blood vessel of 
the ovary. 
Madreporic body. 
Micropyle. 
Dorsal mesentery. 
Muscle fibers. 
Circular muscle fibers. 
Longitudinal muscle fi- 
bers. 
Longitudinal muscles in 
the wall between aq. r. 
and h’pn. r. (Plate 4), 
and longitudinal mus- 
cle fibers of rudimen- 
tary ambulacral foot 
(Plate 6). 
Longitudinal muscles of 
tentacles. 
