REPORT ON THE STOMATOPODA. 73 



little longer and narrower than the sixth and seventh thoracic somites, and a little 

 shorter than the first four abdominal somites, which are about equal in length, as wide as 

 the sixth and seventh thoracic, smooth on the dorsal surfaces, and with marginal keels or 

 ridges on their lateral edges, the postcro-lateral angles of which arc nearly right angles. 

 The fifth abdominal somite is longer than, and quite difTereut from, those in front of it, as 

 its dorsal surface is sculptured by numerous sublongitudinal ridges symmetrically 

 arranged on each side of a broad median ridge or carina. The ridges are not quite as 

 long as the somite, which has along its anterior and posterior borders smooth bands 

 which are not broken into ridges. The lateral ridges are slightly convergent towards the 

 posterior edge, and their anterior ends are lobed and sometimes irregularly forked. The 

 sixth abdominal somite is shorter on the middle line than at the edges and immovably 

 fused with the telson which is transverse, and nearly twice as wide as long. The 

 posterior end of the body is bent downwards, so that the dorsal surface of the telson faces 

 backwards. The sixth abdominal somite is sculptured in a symmetrical pattern of broad 

 convoluted ridges and tul^ercles, which are so closely crowded together that the dorsal 

 surface is almost covered with them. The dorsal surface of the telson is also sculptured 

 in a complicated pattern, in which six elements may be recognised, first, a transverse 

 ridge lobed on its posterior edge running along the anterior border of the telson ; second, 

 a triangular median area, the broad anterior end of which is elevated above the general 

 surface of the telson, while its narrow posterior portion is sunk between two lateral 

 elevations. The median area is convoluted and di\'ided into five lobes, a median anterior, 

 two antero-laterals which are again subdivided, and two posterior lobes or ridges, one 

 of which runs backwards on each side of the deep narrow postero-median notch ; third, 

 on each side of the median area an elongated oval elevated area, which is divided into 

 halves by a longitudinal furrow, and also divided by lateral furrows into a number of 

 secondary lobes ; fourth, three thickened longitudinal marginal keels on each side 

 external to the oval elevation. The six short acute marginal spines are crowded together 

 in two sets, on the posterior edge of the telson, with a broad space fringed with small 

 spines between the submedians. 



The uropods are small, and the basal prolongation (PI. XVI. fig 3) ends in two short 

 stout acute spines, the outer larger and longer than the inner, and with a slight enlargement 

 on its inner edge. The row of marginal spines, about ten in number, on the outer edge 

 of the second joint of the exopodite curves upwards on to the dorsal surface at its proximal 

 end. The inner edge of the dactylus (PI. XIV. fig. 3) of the raptorial claw is finely serrated, 

 and the basal enlargement on the outer edge is semi-circular, abruptly limited distally, 

 and indented on its outer margin. 



Size. — The length of the single specimen is l:n7TJ inches from the tip of the rosti-um 

 to the middle line of the telson. 



Habitat. — The single female specimen is from the reefs at Levuka, Fiji. 



(ZOOL. CHALL. EXP. PART XLV. — 1886.) Yy 10 



