PACIFIC 
OLIGOCH MTA. 183 
REFERENCE TO LETTERS ON PLATES. 
a. c. gl. anterior caleic gland. 
a. f. anterior fold of nephridium. 
a. nephr. anterior nephridia. 
a. spd. anterior spermduct. 
atr. atrium. 
bd. body-wall. 
bl. blood vessel or capillaries. 
bl. s. blood sinus. 
br. bridge in nephridium. 
buc. buceal cavity. 
c. clusters of lunate cells. 
c. c. columnar cells. 
c. ep. coelomic epithelium. 
c. gl. calciferous glands. 
ch. discharge chambers of glands. 
chlo. chloragogen cells. 
cil. ciliated epithelium. 
el. c. clitellar cells. 
el. clitellum. 
c. m. circular muscles. 
com. commissures. 
c. r. ciliated rosettes or sperm-funnels. 
c. t. connective tissue. 
cu. cuticle. 
d. gl. dark staining glands. 
d. pr. dorsal pore. 
d.v. dorsal vessel. 
e. epithelial cells. 
ept. epithelium. a 
gl. glands. 
gl. c. unicellar glands. 
gl. pr. glandular part of prostate. 
gizz. gizzard. 
h. heart. 
hy. hypodermis. 
7, s. gr. intersegmental groove. 
l. c. large cells. 
1. m. longitudinal muscles. 
m. muscles. 
m. atr. muscular atrium. 
mes. mesenteric tissue. 
m. pr. muscular prostate. 
n. nephridia. 
n.c. nerve cells. 
ne. nerve ganglion, 
nec. neck of nephridium. 
neph. nephridium, 
neph. p. nephropore. 
es. esophagus. 
ov. ovary. 
ovd. oviduct. 
org. Sense organ. 
p.c. gl. posterior calciferous diverticulum. 
p. f. posterior fold, nephridium. 
phx. pharynx. 
p. neph. posterior nephridia. 
pr. prostate. 
p- spd. posterior spermduct. 
pr. sto. prostomium. 
ps. penial seta. 
prt. peritoneum. 
se. secreted matter. 
s. int. sacculated intestine. 
sep. gl. septal gland. 
sep. septum. 
s. gl. suprapharyngeal glands. 
s. org. 6. sense organ cells in equatoreal zone. 
8. org. pr. sense organ cells in prostomium. 
spc. sperm-cells. 
spd. spermduct. 
spgn. spermatogonia. 
spr. spur of nephridium. 
8. ps. sac with penial seta. 
sp. 8. sperm-sacs. 
s. ph. sgl. subpharyngeal glands. 
spth. spermatheca. 
spth. p. spermathecal pore. 
t. testes. 
t. m. transverse muscles. 
trb. trabecula. 
th. spd. thicker part of spermduct. 
tu. tubular intestine. 
tub. p. tubercula pubertatis. 
ty. typhlosole. 
u. c. unicellular glands. 
v. g. ventral ganglion. 
v. v. ventral vessel. 
v. sgl. ventral gland. 
w. “ windings ” of nephridial ducts. 
