120 Addis on E. Verrill, 



ground-color ; usually a brighter red median dorsal line ; ovaries 

 of female show through the integument as two greenish patches. 

 Large chela was pink with light brown tips. Chelae retain a red- 

 dish color a long time in formaline or weak alcohol. These speci- 

 mens made a sharp snapping noise, loud for so small a species. 

 Length of the body of the larger ones, 20 to 23 mm. 



Nearly all were adults of about the same sizes. The following 

 additional notes were taken from these specimens while they were 

 fresh from the sea. The stylocerite usually does not quite reach 

 the end of the first antennular article. The narrow antennal scale 

 is about half as long as the carpocerite and about equal to the 

 basicerite; its spine is longer and wider, about three-fourths as 

 long as the carpocerite. Basicerite is long, strong, and acute ; its 

 secondary spine is short, but acute, longer than wide. 



The legs of the fifth pair are much smaller than those of the 

 third pair ; the propodus has, on the distal half, a brush consisting 

 of eight oblique compact clusters of short setae; the dactyl is 

 small and short ; its hooks are small, short, evenly curved and but 

 little divergent, the lower one being a little more incurved than 

 that of the third pair of legs, as well as smaller. 



The narrow tip of the telson usually had six long plumose hairs 

 and four more slender smooth ones. 



Probably this is the species referred to by Mr. G. B. Goode 

 (op. cit., 1878) as follows : 



"Some smaller species of the genus are found only in the cavities 

 of a large aplysine sponge, abundant on the reefs. I have picked out 

 seventy or eighty from a fragment of sponge not more than three 

 inches in diameter. When the sponge is taken in the hand, the 

 quick succession of clickings reminds one of the sound of the 

 instruments in a large telegraph office" 



"When one of these animals is put in an earthen or glass vessel 

 it makes a much louder noise, resembling a quick tap with the 

 finger nail, or the back of a knife, upon the edge of the same 

 vessel. This noise is produced by a convulsive snapping of the last 

 joint of the large claw, by a movement resembling that of the 

 spring beetles (Elateridae), and the sounds are quite similar. 

 Possibly these movements may have a protective object, enabling 

 the little decapods to escape from the grasp of enemies, or to work 

 out from under the stones and loose sand in which they must often 

 become buried." 



