I
I S
I
I
1
OD
GO
APP
BP
G
AU V PCAC K R P A
A
I
I l l
I I /
M
tS
ST
IS
ss
F
I I I I I
6 m m
8
MG
GO
OD
CTI MG
io
R PA SDD
M
ss
I I Y
I I MG CTI ST
, 5 m m ,
APP TA
G
AU ERD
PC
AC K
I I
ES CO
I I
I
I V I ARD I
I
I S
I
I
VG
C
FIG. 18. Figures illustrating the disposition of the organs in the mantle cavity especially
the ctenidia of three representative genera of shipworms. A, Teredora princesue
with the ctenidia extending from the side of the mouth to the siphons ; B, Teredo
fweifera representing the typical condition in shipworms and C, Nmaitora hedleyi
with reduced ctenidia. AA, anterior adductor muscle ; AC, anal canal ; AN, anus ;
APP, caecum; ARD, afferent renal duct ; AU, auricle ; BP, brood pouch ; CO, collar ;
CTI, coiled typhlosole of the intestine ; DD, digestive diverticula ; EC, epibranchial
(exhalent) cavity; ERD, efferent renal duct; ES, exhalant siphon; F, foot;
G, gill; GO, gonad; IS, inhalant siphon; K, kidney; M, mouth; MA, manble;
MG, midgut ; 0, oesophagus ; PA, posterior adductor ; PC, pericmdium ; R, rectum ;
RD, renal duct ; SDD, specialized part of the digestive diverticula ; SS, style sac ;
ST, stomach ; TA, typhlosole of the caecum ; V, ventricle ; VG, visceral ganglion.