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



iu such a position as to admit of the front part of the globule being brought precisely in 

 the same axis. Thus, no doubt, a much more complete condensation of light may be 

 effected than could possibly result from the action of the globule alone. Within the 

 ocular pedicle occurs, moreover, in both sexes, a luminous organ, similar in structure to 

 the one described above in Euphausia (see fig. 1). 



Of the female specimens in the collection, two were ovigerous. The ova are (see 

 fig. 1) very large, and of course few in number, as also contained within a common sac- 

 cular envelop, oblong and somewhat flattened, and extending beneath the greater part of 

 the trunk. The peculiar slender, non-ciliated bristles issuing from the endopods of the 

 antepenultimate and penultimate pairs of legs in the female, serve most probably for 

 aflixing the ovisac and keeping it in sihi. 



Habitat. — The specimens in the collection were all taken by the tow-net, in the 

 following localities : — 



The range of the species would accordingly seem to be rather extensive, comprising, 

 as it does, the South Atlantic and Pacific Oceans, as also the Celebes Sea. 



38. Stijlocheiron suhmii, G. 0. Sars (PI. XXVII. figs. 1-4). 



Stylocheiron suhmii, G. O. Sars, Preliminary Notices on the Challenger Schizopoda, No. 36. 



Specific Cfiaracters. — Form of body rather short. Carapace larger than in last 

 species, without any distinct dorsal crest, rostral projection triangular, acute. Last 

 caudal segment scarcely longer than preceding. Eyes smaller than in Stylocheiron 

 carinatum, cornea much narrowed in upper part. Antennular peduncle in female 

 exceedingly slender, equalling carapace in length, last joint longer than second. Antennal 

 scale projecting considerably beyond second joint of antennular peduncle, very narrow, 

 linear, apex obliquely truncate. Second pair of legs almost as long as the body, carpal 

 and meral joints subequal, propodal joint with three slender spines at end of inner edge, 

 terminal joint produced as a strong unguiform spine and with two shorter spines 

 springing from either side. Uropoda shorter than telson, terminal plates subequal. 

 Length 8 mm. 



Remarks. — Among the drawings executed by the late Dr. v. Willemoes-Suhm during 

 the Expedition, there is one representing this form, and as the species, therefore, may be 



