0. L. Boulenger 
155 
INDEX TO LETTERING. 
An. Anus. 
B. Rudimentary bursa enclosed by larval skin. 
C. Constriction in tail of sheathed larva. 
Ce. Head. 
C.h. Inflated cuticle of head of adult. 
C. 'p. Head papillae. 
D. Dorsal ray of bursa. 
E. d. Externo-dorsal ray of bursa. 
E.l. Externo-lateral ray of bursa. 
Emb. Embryo within egg-shell. 
Ex.c. Excretory canal. 
Ex.p. Excretory pore. 
G.r. Genital rudiment of larva. 
Int. Intestine. 
L.t. Larval tail. 
L. v. Latero-ventral ray of bursa. 
M. l. Medio-lateral ray of bursa. 
N. Nucleus of intestinal cell. 
N.r. Nerve ring. 
Oes. Oesophagus. 
Ov. Ovary. 
P.l. Postero-lateral ray of bursa. 
Red. Rectum. 
S. Larval skin about to be cast. 
Sh. Sheath of free larva. 
Sh'. Sheath of larva thrown into folds. 
Sp. Spicules of male. 
T. Tail of sheathed larva. 
T.m. Terminal membrane of united spicules. 
T.p. Rod-like terminal process of tail. 
TJt. Uterus. 
V. Vacuole in intestinal cell. 
Vu. Vulva of female. 
V.v. Ventro-ventral ray of bursa. 
