n8 Addison E. Verrill, 



is wider; rather more than half the length of the propodus and 

 dactyl, and rather less than half the length of the merus. Merus 

 is fusiform, three and one-half to four times longer than wide, its 

 length is nearly equal to the sum of the propodus and carpus. 



The third maxilliped (pi. 38, fig. id n"'; n"', x) has about nine 

 spines at its apex and about 13 transverse rows of unequal hairs 

 and spines on the dactyl, the distal ones long. 



The uropods (pi. 37, fig. i, u. ; pi. 38, fig. i, u; pi. 40, fig. 2f ) 

 are large and broad, longer than the telson; the outer lamella is 

 the larger, broadly obovate, with a faint distal sutural line and 

 notch, at which stand three small spines, the middle one articulated ; 

 proximal to these a row of smaller denticles, about eight in the 

 female, ten to twelve in the male, extends for nearly half the 

 length of the outer margin, decreasing in size; both lamellae are 

 fringed with long hairs ; the inner one has some hairs on the 

 surface. Inner lamella is more nearly elliptical. 



The telson (same figures, t) is longer than wide, greatest 

 breadth about two-thirds the length; it is rather triangular, 

 broadest with convex margins near the base; decreasing rapidly 

 to the very narrow end, with somewhat incurved margins distally ; 

 narrow part about one- fourth the length; tip has two slender 

 spines at each angle, occupying about two-thirds of its breadth; 

 inner one is about one-third longer than outer one. Between the 

 spines the median part is narrow, a little prominent, truncate, and 

 bears four to six long plumose hairs, and some simple ones. The 

 upper surface has a median groove and a slight carina each side 

 of it. 



The four dorsal spines in the male are larger and longer than 

 the terminal ones, and are separated longitudinally by a distance 

 not more than their length; in the female (pi. 37, fig. i t) they 

 are smaller and not so near together ; the posterior pair are much 

 nearer together than the others. 



General color is reddish or pink. Length about 1 6 to 20 mm. 

 It inhabits the cavities of living sponges of several species, often 

 in large colonies. We found it much the most common species of 

 the genus at Bermuda. 



In a lot of 37 specimens taken at Long Bird Island, Apr. 19, 

 1898, 18 had the large chela on the left side; 19 on the right. 

 There is some variation in the chela in this lot. Some have it more 

 swollen than usual ; others have it more oblique, or more elongated. 



