206 E. W. SEXTON, 



be another row beyond this of the medium-sized, and in addition three 

 long fine, thread-like setae are found near the distal end, the longest 

 being nearest to the hand and much exceeding it in length. The hand 

 widens a little distally, hind margin pectinate ; palm slightly oblique, 

 fringed with long setae, and carrying at the palmar angle, besides the 

 very large palmar spine, a group of five long spines, the apical flagella 

 of which are of great length. The finger is a little longer than the 

 palm, and crosses the palmar spine. For the construction of finger and 

 spine, see fig. 7. 



Gnathopod 2, 5th joint very slender, considerably more than twice 

 as long as the 6th, furnished on the distal posterior margin with 

 dense rows of setae. Tlie setae appear to be arranged in groups set 

 closely together along the margin, each group containing four graduated 

 setae. The hand widens distally ; it resembles that of Gnathopod 1 

 in the construction of the finger and palmar spine and in the arrange- 

 ment of the long setae on the palm. The branchial vesicles are large, 

 as long as the basal joint ; incubatory lamellae large and wide, exceed- 

 ing the basal joint in length. 



Peracopods 1 and 2, practically subequal in length ; branchial 

 vesicles large, incubatory lamellae long and narrow. 2nd joint very 

 long and slender, with long plumose setae on both sides; 4th, 5th, 

 and 6th joints subequal, fringed posteriorly with long fine setae ; 6th 

 joint with a stout spine and a dense fringe of these setae distally, 

 almost concealing the finger, and exceeding it in length. The finger, 

 as in all the peraeopods, has a long nail, both finger and nail pectinate 

 along the outer curve ; with two setules inset close to the nail, and one 

 long plumose seta proximally on the outer margin. In peraeopod 2 the 

 5th and 6th joints have the anterior margin strongly pectinate. 



Peraeopod 3, 2nd joint almost circular, one setiform spine and 

 five short stout ones on the lower part of the anterior margin, nine 

 deep serrations posteriorly; 4th, 5th, and 6th joints increase rapidly 

 in length and decrease in thickness, all furnished with long sen- 

 sory spines some of which are remarkable for the extraordinary 

 length of their apical filaments. Another variety of spine peculiar to 

 this peraeopod is to be found on the posterior margins of the 5th and 

 6th joints, eight on the 5th and seven on the 6th, each inset with a 

 small long-filamented spine ; the shaft is laminar, and the apex of the 

 spine is produced to nearly the length of the apical filament (Plate III, 

 fig. 8). The branchial vesicle and incubatory lamella are small, the 

 hairs on the latter very long. 



Peraeopod, 4, 2nd joint large, rounded, more produced posteriorly 

 than in Peraeopod 3 ; two setiform and six short stout spines anteriorly. 



