56 T. V. HODtiSON. 



NOTOXENUS SPINIFER. 



(Plate IX., Hg. 3.) 

 Specific chanictcni : — 



CephnloHoiuc rouiulci], witli loiij; ocular pfduncles eiuliiijr in four kiuiiII knobs Riirroiindinjr the eye. 

 JMc'sosoiue with iniil-dorsul spiiiu on each sc'ciuent and also on tii-st se;;iucnt of nietasoine. 

 Lateral extrcnntics of every se};uient very distinct from cai-h other. 



Urosonie very nearly as lon^ us six sc;^raents of the niesosome. Top-shaped, with diminutive 

 preterminal uropo<la. 



The IkkIv tnnns a pointed oval ami is inmli vaulted anteriorly or round- 

 .sliouldered. The interval l)et\vccn the third and fourth segnicut.s of the niesosorue is a 

 variable feature, but in no case is it specially conspicuous. 



The cephalosome is subcircular when seen from above, but at first sight it does 

 not appear t<> be so owing to the foreshortening ilue to the curvature of the body. 

 The eye-stalks arise laterally, they are slender and extremely long, nearly as long as 

 the diameter of the cephalosome, and extend that structure beyond the first segment of 

 the niesosonic. They are slightly enlarged at the extremity, and the eye lies in the 

 middle of four small, l)lunt lobe.s. 



The mesosome comprises seven distinct segments, in the tirst of which the 

 cephalosome is to some extent embedded. The next three segments are straight, the 

 third of the entire series being the widest. The three posterior segments are curved 

 backwards, their cur\ature increasing as their diameter decreases. All the segments 

 are provided with a baiUwardly curved spine in the mid-dorsal line, their size is 

 proportionate to the .size of the segment, but their position varies, those of the last three 

 being on the posterior- border of their respective segments. The epimeraarc iii.separable 

 from their respective segments ; they are large and irregular in shape. Those of the 

 first three segments are more or less directed forwards and to .some extent rounded 

 at the extremity, the fourth is more truncated, those of the last three are rounded. 



The metasome consist^s of a single segment, wedged in the curvature of the last 

 segBient of the niesosome, and the nro.some ; the former carries a mid-dorsal spine. 

 The uro.some is pointed, pegtop-shaped, more tnan one-third the length of the entire 

 animal, with small preterminal uropoda. Its entire margin is fringed with small, 

 rather coar.se sette, and its surface is also well covered. 



The uropoda are very small, single-jointed, with terminal .sctai. The entire body 

 IS rather .sparsely covered with small sctie ; these are more abundant and conspicuous 

 on the epimera. 



The first antenna has a peduncle of two joints, the basal one being quite twice 

 as long as the other, both are setose distally ; the Hagelluni is about twice as long 

 as the peduncle and has oidy four joints, the fir.st being rather long. 



The second antenna has a peduncle of six joints ; of these the first twn arc very 

 short, especially the .second; the third is as long as the two together; the fourth is 



