[75] 



DECAPODA FROM ALBATROSS DREDGINGS. 



419 



The branchiae are the same iu number and have the same arrange- 

 ment as in 8. arcticus, but the posterior branchia on the twelfth (ante- 

 penultimate) somite is nearly as large as the anterior, which is the 

 largest of tlie series, and the branchiaj of the penultimate somite 

 are very nearly alike, and not very much smaller than the pair next in 



front of them. 



Measurements in millimeters. 



Station 2002 



2003 



Sex 



Length from tip of rostrum to tip of telaon 



Length of ciirapax including roatnim 



Length of rostinm 



Hight of carapax anteriorly 



Hight of carapax posteriorly 



Breadth of carapax 



Length of eye-slalk and eye 



Greatest diameter of eye 



Length of peduncle of antennula 



Length of distal segment 



Length of antcnual scale 



Breadth of antennal scale 



Length of sixth somite of pleon 



Hight of sixth somite of pleon 



Breadth of sixth somite of pleon 



Length of telson 



Length of inner lamella of uropod 



Breadth of inner lamella of uropod 



Length of outer lamella of uropod 



Breadth of outer lamella of uropod 



Sergestes mollis, sp. nov. 



Sergestes, sp. indet., Smith, Bull. Mus. Comp. Zool,, s, p, 100, 1882. 



This species resembles S. robustus considerably in form and size, but 

 the whole integument is very soft and all parts of the animal exceed- 

 ingly fragile; the cephaloperteon is scarcely at all compressed, the ros- 

 trum is small and obtuse, and the eyes are very little larger than the 

 eye-stalks. 



2[ale. — The carapax is broad and the dorsum broadly rounded to the 

 base of the small obtuse rostrum, which projects very little anteriorly. 

 The cervical suture is much more conspicuous than in either S. robusUrs 

 or arcticus. The eye-stalks to the tips of the eyes are nearly a sixth 

 as long as the carapax and about a third as long as the antennal scale, 

 and the diameter of the eye itself is about a third of the length, or 

 very little greater than the stalk. The peduncle of the antennula is 

 nearly as in S. robustus, very stout, much longer than the antennal scale, 

 and more than half as long as the carapax ; the proximal segment is 

 about half as long as the antennal scale, and the middle and distal 

 segments approximately equal in length. The proximal segment of the 

 upj)er or ma^jor flagellum is nearly half as long as the distal segment of 

 the i^eduncle and more than twice as long as the proximal segment of 

 the lower flagellum, which is nearly as in the allied species. The an- 

 tennal scale is less than half as long as the carapax, fully a third as 

 broad as long, as broad at the tij) as in S. robustus, and without any 

 tooth or spine at the distal end of the non-ciliated outer edge, or with a 

 very minute one. 



