286 A HISTORY OF EECENT CRUSTACEA 



second maxillipeds, where it is held in place by the flat 

 oval chelaa 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 Gueriu. 



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. 

 Fseudosquilla 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 falcatus (ForskSl), according to Koss- 

 mann, must supersede the better known name Gonodac- 



