144 THE VOYAGE OF H.M.S. CHALLENGER. 



beyond the tip of the scale ; the terminal part is composed of about five very long and 

 slender articulations. 



The second pair of legs (see fig. 1), when fully extended, almost equal in length the 

 whole body, and have the meral and carpal joints nearly equal. The propodal joint 

 is, as usual, somewhat thickened, and bears at the end of the inner edge three slender, 

 non-ciliated spines. The terminal joint is conically tapering, and juts out as a strong 

 unguiform spine, having also, on either side, two other somewhat shorter ones. 



The telson would not seem to exhibit any essential difference from that in the preced- 

 ing species. 



The uropoda, on the other hand, would appear to be relatively shorter, not nearly 

 reaching to the tip of the telson, and with both plates about equal in length. 



Habitat. — The three specimens of this form in the collection were taken at the 

 surface of the sea, in the following localities : — 



The distribution of the species, as yet known, would accordingly seem to be confined 

 to the western part of the Pacific and the sea surrounding the Philippine Islands. 



39. Stylocheiron longicorne, G. 0. Sars (PL XXVII. fig. 5). 



Stylocheiron longicorne, G. 0. Sars, Preliminary Notices on the Ch.iUenger Schizopoda, Xo. 37. 



Specific Characters. — Form of- l:)ody a little more slender than in the last species. 

 Carapace very slightly keeled above in anterior part ; rostral projection shorter than in 

 Stylocheiron suhmii, acute. Last caudal segment scarcely longer than precding. Ej^es 

 rather large and much compressed, with cornea very narrow, oblong, but slightly 

 contracted in its upper part. Antennular peduncle remarkably slender and elongate, 

 exceeding carapace in length, both flagella also very long and slender. Antennal scale 

 similar in form to that in Stylocheiron suhmii; flagellum enormously produced, with 

 extremely elongate articulations. Second pair of legs likewise of unusual length, longer 

 even, when fully extended, than the whole body, carpal and meral joints subequal, and 

 nearly as in Stylocheiron suhmii. Uropoda longer than telson, with inner plate scarcely 

 longer than outer. Length 9 mm. 



Remarks. — This species is closely allied to Stylocheiron suhmii, but can be readily 

 distinguished by the peculiar compressed form of the eyes, as also Ijy the prodigious length 

 of the antennal flagellum and of the second pair of legs. 



