286 A HISTORY OF RECENT CRUSTACEA 
second maxillipeds, where it is held in place by the flat 
oval chelz which are tightly clasped over it. At the 
opening it stretches out as far as it can reach without 
leaving the burrow, and dropping the armful of sand it 
smoothes it down until it is level with the surrounding 
surface. This process is then repeated until the burrow 
reaches a great depth, for I have dug for three or four feet 
without reaching the end, and all the specimens which I 
kept in confinement burrowed to the bottom of the 
aquarium. When the burrow is finished the animal 
spends most of its time near the top, and as the semi- 
circular exopodites of the abdominal appendages complete 
the outline formed by tne convex dorsal surface, it com- 
pletely fills the circular tube, into which the constantly 
vibrating scoop-like abdominal appendages carry a con- 
tinuous current of water, which escapes through the loose 
sand.’ 
Pseudosquilla, Dana, 1852, has a name originally coined 
but not published by Guérin. 
In this genus the terminal joint of the second maxil- 
lipeds is without basal enlargement and with few marginal 
spines or none; the pleon is smooth, convex, and narrow ; 
the terminal joint of the first pleopods of the male im- 
perfectly divided by a marginal notch into an inner and 
outer lobe; the telson has the submedian spines long and 
tipped with movable spinules, and usually it has a single 
secondary spinule, but sometimes two, three, or four such 
spinules between the submedians and intermediates. 
Pseudosquilla ciliata, Miers, a species found alike at Hono- 
lulu and in the West Indies, is of a bright cherry red 
colour. 
Gonodactylus, Latreille, 1825, has the terminal joint of 
the second maxillipeds enlarged at the base, and without 
marginal spines; the pleon narrow, convex, thick; the 
primary marginal spines of the telson very large, with one 
or two secondary spines between the submedians and 
intermediates. 
Gonodactylus faleatus (Forskal), according to Koss- 
mann, must supersede the better known name Gonodac- 
