70 T. V. IIODCSOX. 



NoTOPAlS SI'ICATl'S. 



(Plate VIII., liir. 1.) 

 Spetific charactcra : — 



CepUalosoine armed dorsallv, with two stout spines and two lateral ones. 



Mesosomc with the five anterior sejrments armed with four strong forwardly directed spines, the 

 first four segmenU having others laterally. 



Urosome triangular, truncated, with minute terminal uropoda. 



The cephalosome is wide, nenrly as wiilc as any other part of the hotly. Its 

 auteiior margiu appears to be rouudeil, l»ut close cxaniinatiou shows that it is deeply 

 excavated, aud the Hrst pair of antennse arise uciir the anterior liordcr of this 

 exaivatiou. Not far from the rounded lateral margins of tlie ccplialon is a small hut 

 distinct spine, and there are two more prominent dor.sally, but more tlistant from the 

 middle line than on succeeding segments. 



The impression one receives in examining this animal is that the cephalon and 

 first segment of the thorax are distinct, the latter being mucli smaller than, and above 

 the former, a condition which occurs in the genera Ilyarachna and Pseiularachna of 

 Prof G. 0. Sars. 



Of the mesosome tlie first two segments are subecjual, and the two following ones 

 are also .subequal but a little longer, their anterior margins are provided with four 

 stout and prominent spines directed forwards, these arc placed at approximately equal 

 distances apart, the median pair being the largest. The epimera are rather elongated, 

 not separable from the ])ody, but where they might be said to arise is a small, blunt 

 spine ; the epimeron itself is in each case rounded, and aljout the middle of its margin 

 is another spine not so large as the dor.sal ones ; an additional one arises at their 

 anterior margins in the first, .second, and fourth of these segments. The three posterior 

 segments are separated from the preceding by a distinct waist. These segments are 

 curved backwards ; the first two are subequal, the third is al)out half the size ; the 

 anterior margin of the first bears four large_ spines similar to those on the preceding 

 segments. 



The mctasomc comprises a single plate, the urosome, which is a truncated triangle, 

 it,s margins sloping from the mid-dor.sal line. It is covered with fine setse more thickly 

 than the rest of the body, where they are rather sparingly distributed. The uropoda are 

 minute, terminal, and arise ventrally. Each consists of a very small exopodite, a rather 

 barrel-.shaped and diminutive endopoditc of about half the size, both terminating in a 

 few .setae. 



The first antennae arise quite close to the middle line just below the upper margin 

 of the cephalon ; the first joint of the peduncle is very large comparatively and bears 

 two teeth on its inner distal margin ; it terminates as a cone, and on the upper surface 

 of this are one or two short joints, I cannot be certJiin which it is ; the flagellum is very 

 slender and con.si.sts of a long joint, a very short joint and a long portion in which the 

 artiiulatioiis under existing conditions are indistinuniishable. 



