156 



Dr. W. T. Caiman on a 



Paratlielphisa spinesceris, sp. n. 

 Carapace four fifths as long as broad, the greatest breadth 

 a little in front of the middle, only slightly convex antero- 

 posteriorly and from side to side. Surface smooth ^ and 

 polished, with very minute punctuations. The inter-regional 

 grooves nearly obsolete, the median portion of the cervical 

 groove not extending beyond the branchio-cardiac grooves on 

 each side. The distance between the external orbital angles 

 is a little less than two thirds of the greatest breadth. ^ The 

 front is rather steeply deflexed, with the margin slightly 

 everted, extending a "^little in front of the external orbital 



Parathelphusa spincsccns, J 



angles as seen from above, with a distinct and moderately 

 deep median notch. Seen from in front it is convex. The 

 transverse diameter of the orbit is equal to half the width of 

 the frontal margin. The frontal margin and the upper orbital 

 margin are granulated. The lower orbital margin is more 

 distinctly granulated than the upper; its inner angle is not 

 produced, but there is a prominent, rounded, internal sub- 

 orbital lobe. The postfrontal crest is nearly obsolete. It is 

 only represented by the obscurely defined epigastric lobes, 

 which are very slightly rugose in front and are separated by 

 a shallow mesogastric furrow, showing only in one specimen 

 a trace of bifurcation. 



The antero-later^l margin is convex and h about as long 



