i34 Addison E. Verrill, 



and more strongly incurved ; inner one is not much shorter than 

 the outer ; the propodus has about six spines on the inner edge, 

 besides the pair of distal ones, and a corresponding number of 

 small clusters of hairs on the outer margin. The carpus has a 

 spine on the outer distal angle, and about three clusters of hairs 

 on the outer margin. The merus has about three clusters of hairs 

 on the inner edge, besides the distal cluster. 



The uropods are narrow ovate, in length about equal to the 

 telson, nearly equal in length ; outer the wider, with two sutural 

 spines. 



The telson is long and narrow, with the edges turned down ; it 

 tapers regularly to the narrow tip, which has a small, spiniform 

 median process; each side of this there are two unequal spines; 

 the inner one is longer than the median process ; the outer one 

 much shorter (pi. 42, figs. 2t, 2tx). The length to the breadth of 

 the telson is about 1:3. It has four dorsal spines. Details of 

 structure of various other appendages are illustrated by the figures 

 (plates 42 and 44). In life it is often nearly colorless and trans- 

 parent ; sometimes marked with bluish or brownish patches. 

 Length 1 5 to 20 mm. 



This delicate species is common in floating masses of "gulf- 

 weed" (Sargassum}. It has been found as far north as Vineyard 

 Sound, Mass. (S. I. Smith.) Very common in the Gulf Stream 

 farther south. 



Bermuda (coll. G. Brown Goode). Near the Azores (Milne- 

 Edwards) ; African Coast (Krauss) ; Porto Rico (Rathbun) ; 

 Beaufort, N. C. (Hay and Shore). It has been taken at Bermuda 

 by nearly all collectors. It is nearly always associated with 

 Leander tenuicornis and the small crab, Planes nuinttits. 



Thor Kingsley. 



Thor Kingsley, Proc. Acad. Nat. Science, Philad., Vol. xxx, p. 94 (6), 

 1878. M. J. Rathbun, Brach. and Macrura Porto Rico, p. no, 1901. 



The rostrum is short, acute, with the upper margin toothed, 

 lower smooth. The carapace has an antennal spine. Antennules 

 have a short thick stalk and are biflagellate ; the outer flagellum 

 is very thick, terminated by a short slender spine. Antennal scale 

 is large and wide. 



The mandibles are bilobed, but lack a palpus. The third maxil- 



