388 
PACIFIC SCIENCE, Vol. XX, July 1966 
of the dorsal retractors. Coelomic papillae but 
no transverse body dissepiments are present. 
The nephridia are large, brown, and free 
except for about a quarter of their length. They 
extend as far as the base of the dorsal retractor. 
Well-developed eggs were found in the body 
cavities of the two specimens; they were gen- 
erally uniform in size and about 95-11 Op in 
diameter. They appeared to be mature. The 
nerve cord is not fixed firmly to the body-wall. 
Systematic position: These specimens are 
members of the subgenus Siphonosoma sensu 
strictu of Fisher 1952. They are very close to 
S. pescadolense Sato 1939 and S. takatsukii Sato 
1935, the former collected from Formosa and 
the latter from the Caroline Islands. They differ 
most noticeably from Sato’s species in that they 
possess a well-developed intestinal or rectaJ 
caecum. 
I am indebted to Rod. Wells for the drawings 
of S. hawaiense. 
REFERENCES 
Fisher, W. K. 1950. Two new subgenera and 
a new species of Siphonosoma (Sipunculoi- 
dea). Ann. Mag. Nat. Hist, ser. 12(3): 
805-808. 
1952. The sipunculid worms of Cali- 
fornia and Baja California. Proc. U. S. Nat. 
Mus. 102(44) : 373-437. 
Sato, H. 1935. Sipunculoidea and Echiuroidea 
of the West Caroline Islands. Sci. Rept. 
Tohoku Imp. Univ., ser. 4, Biology 10:299- 
329. 
1939* Studies on the Echiuroidea, 
Sipunculoidea and Priapuloidea of Japan. 
Ibid. 14:339-460. 
