i8o 
ZOOLOGY OF THE FAR EAST. 
anterior ones, projected almost at a right angle from the sides of the head ; the width 
across the head, from the tip of one process to that of its counterpart on the other 
side, was 5 mm. The cerata were broadly lanceolate in outline, circular in cross-sec- 
tion ; they were not at all inflated at the base but tapered quite gradually from the 
broadest point, which was situated near the base, to the tip ; the total length was not 
or hardly more than twice the greatest transverse diameter. These structures 
were very numerous, but were thrown off with extreme readiness. They were 
arranged on each side of the notum roughly in two alternating rows, those of the 
outer row being relatively a little more slender than those of the inner row. 
The general colour of the animal was translucent olive-green, considerably darker 
in some individuals than in others. The head and the posterior part of the foot were 
almost colourless, the naked part of the back more or less conspicuously marbled — in 
some individuals it was almost uniform. The cerata were dull transparent green with 
scattered whitish granular specks that tended to congregate at the tips ; in the centre 
of each, internally, a more or less contorted dark greenish longitudinal mass was 
conspicuous. The rhinophores were marked, also internally, with groups of whitish 
granules at the base and at the tips. The eyes were black. 
" No nettle-cells were observed, even with the aid of a high power of the micro- 
scope, in the cerata of living or freshly killed specimens. 
Locality. — Pools of brackish water at Singgora, Siamese States, east coast of 
Malay Peninsula. January 31st, 1916. Specific gravity of water (reduced to a 
standard temperature of 15° C.) = i'Oo85. 
The animals were crawling in large numbers on a slimy dark green alga that 
coated the mud at the bottom of small pools of brackish water. The water was in 
most places less than a foot deep. A very careful search was made for hydroids or 
other coelenterates on which they might be feeding, but none were found. The pools 
had been formed by an overflow from the Tale Sap ' ' (Great Lake) or Inland Sea of 
Singgora in the rainy season, which was just over. The water must have been of very 
low salinity to begin with, but the salt was being rapidly concentrated owing to 
evaporation. 
" A single specimen, not observed alive, was found in the collection, on a hydroid 
{Bimeria fluminalis) from the Tale Sap near Singgora. Specific gravity of water 
(reduced as before) 1-0040. 30. i. 16." 
The account given b}^ Dr. Annandale of the relative positions occupied by the 
rhinophores and tentacles is remarkable, but I understand from, a sketch (fig. i) which 
he has sent to me and from some further explanations in a private letter that in the 
living animal the fore part of the head bearing the rhinophores projects above and 
beyond the mouth — at the upper corners of the moiith are two distinct oral tentacles 
and below it the anterior margin of the foot is produced into two thin and moderately 
long processes, which are often held curled over the oral tentacles. If plates 
representing European forms such as Stiliger bellulus,^ Placida and Hermaea are 
' Called Embletonia mariae in Meyer and Mobius, Fauna d. Kieler Bucht. 
