AUSTRALIAN MALACOSTRACA. 93 



161. Gelasimus Dussumieri. 



Gelasimus Dussumieri, Milne- Edwards, Ann. des Sci. Nat. 

 3me. serie, t. xviii., p. 148, pi. iv., fig, 12 ; A. M.-Edw., Nouv. 

 Arch, du Mus., t. is., p. 271. 



Distinguished from G. arcuatus by having the fingers relatively 

 longer and more compressed, and the index with equal and 

 regular granules on its trenchant border. 



Moreton Bay ; Port Darwin. 



162. Gelasimus coarctatus. 



Gelasimus coarctatus, Ann. des Sci. Nat. 3me. serie, t. xviii., 

 p. 146, pi. iii., tig. G; A. M.-Edw., Nouv. Arch, du Mus., t. ix., 

 p. 272, pi. xii., tig. 1. 



Front narrow between the eyes and dilated below. Anterior 

 border of the arm multi-denticulated ; mobile finger regularly 

 arched in nearly all its extent, but with the extremity, which 

 terminates in an acute hook, applied for a certain distance against 

 the immobile finger. 



163. Gelasimus forceps. 



Gelasimus forceps, M.-Edw., Hist. Nat. Crust., t. ii., p. 52 ; 

 Ann. des Sci. Nat., 3me serie, t. xviii., p. 118, pi. iii., fig. 11. 



Front narrow, of equal breadth between the eyes and at its 

 extremity. Two denticulated, sub-parallel lines on the inferior 

 orbital lobe ; a very prominent marginal crest on the meso- 

 branchial lobe. Large hand smooth, fingers flattened, straight, 

 longer than the palm. Posterior legs with the third joint 

 very wide. 



164. Gelasimus signatus. 



Gelasimus signatus, Hess, Archiv fur Naturg., Band xxxi., 

 p. 116 (1865). 



Forehead not quite so narrow between the eyes as in the 

 following species ; its lower border almost straight, Large hand 

 almost once and a half as long as the carapace is broad. Arm, 

 carpus, and hand bright red, fingers white. On the lower side 

 of the arm two rows of pearl-like tubercles form a triangle. The 

 fingers have an elevation in the middle of the inner border ; at 



