70 T. V. HODGSON. 



NOTOPAIS SPICATUS. 



(Plate VIIL, fig. 1.) 

 Specific characters : 



Cephalosome armed dorsally, with two stout spines and two lateral ones. 



Mesosome with the five anterior segments armed with four strong forwardly directed spines, the 

 first four segments having others laterally. 



Urosome triangular, truncated, with minute terminal uropoda. 



The cephalosome is wide, nearly as wide as any other part of the body. Its 

 anterior margin appears to be rounded, but close examination shows that it is deeply 

 excavated, and the first pair of antennae arise near the anterior border of this 

 excavation. Not far from the rounded lateral margins of the cephalon is a small but 

 distinct spine, and there are two more prominent dorsally, but more distant 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 much smaller than, and above 

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

 Prof. G. 0. Sars. 



Of the mesosome the first two segments are subequal, 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 are placed at approximately equal 

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

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

 spine ; the epimcron itself is in each case rounded, and about the middle of its margin 

 is another spine not so large as the dorsal 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 about half the size ; the 

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

 segments. 



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

 its margins sloping from the mid-dorsal line. It is covered with fine setae 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 endopodite 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 certain which it is ; the flagellum is very 

 slender and consists of a long joint, a very short joint and a long portion in which the 

 articulations under existing conditions are indistinguishable. 



