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PACIFIC SCIENCE, Vol. XI, July, 1957 
Figs. 1-4. Teredicola typica , female. 1, Habitus, dorsal. 2, Metasome segments 1-2, ventral, showing placement 
of cephalic appendages and legs 1-2 (same scale as male, Fig. 5). 3, Urosome, dorsal (including thoracic somite 
5). 4, Detail of attachment of ovisac. 
of leg 5 present. Integument of urosome rela- 
tively thin; usually the segments entirely ex- 
panded, leaving their broad intersegmental 
membranes clearly defined both ventrally and 
dorsally (this shown by wavy line in Fig. 3). 
Genital segment (urosome segment 2) the 
longest, proximal portion with slightly 
rounded lateral expansions. Genital openings 
dorso-lateral in position, reinforced by strong 
external sclerotized framework on dorsum 
(Fig. 3). Ovisacs attached to opening by long, 
expandable membrane so that the cylindrical 
sacs are held away from body in "floating” 
position (Figs. 1 and 4). Sacs reaching beyond 
caudal rami, attaining length equal to that of 
metasome or more; with numerous, very small 
eggs (Fig. 4). 
Last urosome segment of female (anal seg- 
ment) longer than either of two preceding 
segments and subequal in length to caudal 
rami; proximal part widened. Rami more or 
less divergent, slender, length about 4 times 
greatest width; armed outwardly with short 
seta placed just below middle and terminally 
with four setae, the third from outside much 
stouter and longer than others, its length 
about 2.5 times that of ramus; small seta 
placed subapically on inner, dorsal margin. 
male (Fig. 5). Metasome not swollen as in 
female but with strongly integumented, later- 
ally expanded dorsal plates broadly curved 
under ventrally. Lateral expansions of first 
two segments prominent; those of segments 
3 and 4 rather abruptly contracted in width 
making the division between metasome and 
urosome less prominent than in female. Fore 
part of lateral margin of cephalic segment 
usually gradually and gracefully curved back- 
wards to distal, rounded expansion, but some- 
times the whole margin sloped, thus exhibit- 
