ZOOLOGICAL OBSERVATIONS IN THE SOUTH PACIFIC. 219 
Zoological Observations in the South Pacific. 
by 
Arthur Willey, D.Sc.Lond., 
Balfour Student of the University of Cambridge. 
With Plate 13. 
In the course of a brief stay in Sydney I had the opportunity 
of working up for publication some material obtained by me. 
My warmest thanks are due to Professor W. A. Haswell, who 
has generously placed space and appurtenances at my disposal 
in his laboratory at the University of Sydney. 
ip 
On a New Ampuioxus FROM THE LoutstapE ARCHIPELAGO 
(Asymmetron caudatum, n. sp.). 
(With Plate 13, figs. 1 to 4.) 
Last January, as a result of my dredging operations in the 
magnificent lagoon of the Deboyne groups of islands, of which 
Panaieti is the largest, I obtained, on two occasions, specimens 
of the family Branchiostomide (a single specimen only on each 
occasion), which proved to be a new species, nearly related to 
Asymmetron lucayanum, Andrews. 
‘They were dredged up from a depth of one fathom and seven 
fathoms respectively, living in clean coral sand. In the same 
habitat a species of Ophelia is very abundant, and to the 
casual gaze it bears a striking resemblance to the Amphioxus, 
with which it is associated. This Ophelia burrows in the sand 
with its pointed snout, ike Amphioxus, but more deliberately, 
