44 
J. M. Thomson. 
Telson, trapezoidal, with a terminal emargination. Number of eggs in 
Male. 
Length, 2 1 mm. Similar to the female except in the following points: 
— Antenna l:The first segment has three spines on the lower keel and 
appears to be shorter than the second and third together. Length of the 
appendage about 45% that of the body. Antenna 2 : Segment 4 twice as 
Jong as broad, with a large subterminal tooth, and a smaller tooth above it. 
The ventral spines found in the female are absent. Segment 5 has six 
tufts of setae. Gnathopod 1 : Palm with a row of three spines and one large 
seta. 
Ecology. 
Builds tubes of muddy sand on algae and the rocky substratum in shal- 
low water. They survive some degree of lowering of salinity but disappear 
with the onset of heavy rainfall. 
