EREM/EUS CYMBA. 471 



A tliick, rough, chitinous, transverse ridge separates 

 the frons from the provertex, extending the whole width 

 of the cephalothorax ; from each end of this ridge a 

 similar ridge runs longitudinally backward along the 

 side of the cephalothorax. This transverse ridge is 

 prolonged forward a little beyond the juncture with 

 the transverse ridge, thus forming a short projection 

 which stands free. Inside these ridges are two smaller 

 and shorter longitudinal ridges which start from the 

 pseudo-stigmata and approach each other anteriorly ; 

 they are probably the homologues of the lamellae. 

 Mandibles short and wide but powerful ; the movable 

 chela very strongly curved and dentate chiefly at the 

 end. Pseudo-stigmata far apart, only slightly project- 

 ing, directed outward. Pseudo-stigmatic organs very 

 short, with almost globular heads on extremely short 

 peduncles. Lamellar and interlamellar hairs very short 

 and thick ; they look almost like chitinous points and 

 are caducent. The first and second pairs of legs are 

 carried on a broad lateral shelf of the cephalothorax, 

 which is deeply cleft to receive their articulations. 

 Small second and third tectopedia are present on this 

 shelf, in a modified condition. There do not appear 

 to be any opisthophragmatic processes. The whole 

 upper and lateral surface of the cephalothorax is rough 

 and coarsely granulated or reticulated, the markings 

 being irregular. The dorso-vertex rises to a small 

 round elevation on each side with a broad irregular 

 sulcation between them; behind these elevations the 

 cephalothorax falls and narrows considerably ; but it 

 rises again somewhat, at its actual posterior margin, 

 to join the raised progaster. 



Legs rather short, of nearly equal thickness through- 

 out. Coxse of first and second pairs hidden ; those of 

 third and fourth pairs large, rounded, and con- 

 spicuous. The femora of all legs are large. Those 

 of the two first pairs of legs have very short, slender, 

 curved peduncles for the purposes of articulation. 

 The tibisG are long, the tarsi rather short and inversely 



