hidicm Deep-sea Dredjiiifj. 273 



width ol' tlio inner; the former is .streii;;tlicne<l by a stout 

 nii(h-ib and by a thickening of the outer margin, whicli ter- 

 minates a good way from the apex in a j)rominent spine of 

 the same size and character as tliat of the antennal scale; an 

 inflexible diivresis extends inwards from the base of this spine 

 \\\> to the midiib. The inner ramus is strengtliened by a 

 simihir midrib, from near the base of which a ridge extends 

 obliquely inwards and backwards to the inner margin. 



'J'he legs of the first to the third pairs of opi)Osite sides 

 touch one another in the middle line, and their sterna are 

 hence invisible without dissection ; those of the last two 

 ])airs, on the contrary, are wider a|iart and their sterna are 

 ])lainly visible and have tiie form of an inverted T, the cross 

 stroke of which is, in the hinder and larger of the two, pro- 

 duced forwards, between the bases of the legs of the last pair 

 and over its own down-stroke, as an acute angular {^) ox 

 semicircular ( ? ) plate, beneath the sides of which the genital 

 apertures can in the male be concealed. 



The branchial formula is as follows : — 



2ep.-\-ep.r. -\-'}r. +o =b-\-oi:-\-2e2). + ('p.r. 



35. [Fsah'dopus Huxleyi, sp. n. (PL XIV. figs. 1, 2, 7.) 



? . Stouter. Thoracic and abdominal sterna unarmed. 

 No tubercle between the last spine of the dorsal ridge and 

 the posterior margin of the carapace. 



Colour in life brilliant old-ivory white or straw-colour. 



milliiu. 

 Total length from apex of rosti'um to tip of telson in 



a straight line 141 



Length of rostrum from supra-orbital margin in a 



straight line ol-o 



Length of carapace fi'om supra-orbital to posterior 



margin -IS-o 



Length of abdomen from middle of anterior margin 



of tirst tergum to tip of telson 6.3 



Length of telson 19'o 



Length of antennal scale 21 



Width of ,, , (3 



Length of anteuuularv ilagella 37 



