124 



THE VOYAGE OE H.M.S. CHALLENGER. 



The telson (see fig. 26) exhibits the usual slender form, and has the apex some- 

 what produced and acutely pointed. The subapical spines are of moderate length, and 

 perfectly smooth. Moreover, two pairs of very small denticles occur on the dorsal face of 

 the telson. 



The uropoda {ibid.) have the inner plate very narrow, and reaching almost to the tip 

 of the telson when extended posteriorly. The outer plate is a trifle shorter, Ijut much 

 broader, and ^irojects at the apex, exteriorly, as an acute corner. 



The luminous globules agree perfectly both as to number and arrangement with 

 those in Euphausia. 



Colour. — Some specimens in the collection, preserved in glycerine, have the whole 

 surface of the body, and more particularly that of the tail, dotted over with small stellate 

 pigment-spots of a dark reddish colour. 



Habitat. — Numerous specimens of this characteristic form were collected in the 

 Expedition in difterent tracts of the ocean. Especially in one locality of the South 

 Atlantic, the species would seem, to jndge from the considerable number of specimens 

 obtained, to have occurred in great abundance along with Nematoscclis megaUyps, a form 

 of Euphausiidas to be described further on. All the specimens were taken at the surface 

 of the sea. The localities were as follows : — 



The same species I have also observed in the Mediterranean, at Messina. 



Distribntion. — The distribution of the species w^ould accordingly seem to be very 

 extensive, ranging, as it does, from the Mediterranean, throughout the whole of the 

 North and South Atlantic, the Australian Seas, and the Pacific as far north as 

 Japan. 



