GRAPSOIDEA. 



321 



and we cannot therefore reconcile on this ground the different propor- 

 tions in all the particulars stated. 



Helcecius inornatus. 



Carapax convexus, nudm, angulis anticis f route poster ioribus. Pedes 

 antici sat breves; carpo non duplo longiore quam latiore, margine 

 interno angidato ; manu lata, parte antedigitali paulo oblong a. Seg- 

 vnentum abdominis maris ultimum breviter transversum, penultimo 

 subito angustius. Articulus pedum tertius supra tomentosus. 



Carapax convex, naked, anterior angles posterior to line of front. 

 Anterior feet moderately short ; carpus not twice as long as broad, 

 inner margin having an angle near middle ; hand broad, part pre- 

 ceding fingers somewhat oblong. Last segment of male abdomen 

 short transverse, abruptly narrower than the penult. Third joint 

 of the feet tomentose above. 



Plate 19, fig. 7 a, male, natural size ; 5, front, seen from below 

 obliquely, enlarged ; c, hand, natural size. 



New South Wales ? 



Length of carapax of male, six lines ; breadth, eight and three- 

 fourths lines; ratio, 1 : 1*48; length of larger hand with the move- 

 able finger extended, equal to breadth of carapax ; length of hand to 

 apex of lower finger, eight lines ; length of carpus, four lines, and 

 greatest breadth, two and one-fourth to two and one-third lines; 

 length of hand anterior to fingers, measured to lower basal angle, five 

 and one-third lines, and its breadth, three and one-fourth lines. The 

 medial region of the carapax is partly circumscribed. The right 

 hand is largest in one specimen, and the left in another. 



These dimensions differ from those of the H. cordiformis. The hand 

 and carpus are both more oblong in the cordiformis. Either side of 

 the buccal area there is a smooth, flat, or slightly concave surface, 

 which narrows anteriorly; the same surface in the cordiformis is 

 narrower and much more concave. In both species, the surface either 

 side adjoining the upper outer angle of the buccal area is granulous, 



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