CARCINOLOGICAL STUDIES. 



35 



Gelas. Dussumieri and I cannot find any essential difference. 

 The hand of the larger specimen perfectly agrees with 

 Hilgendorf's figure Ic, those of the two other specimens 

 belong to a variety , which occurs also in Gelas. Dussumieri 

 and which is characterized by the lower finger being fully 

 unarmed. The meropodites of the ambulatory legs, finally, 

 are a little more enlarged than those of Gelas. Dussumieri. 

 I give the measurements, in millimeters, of two specimens 

 from Nossy-Faly, of the Paris type-specimen of Gelas. Urvillei, 

 and of two male specimens of Gelas. Dussumieri from the 

 Mergui Archipelago. 



Distance between the ext. orb. angles . 

 Length of the cephal. (front included) . 



Length of the larger hand 



Length of the palm of the larger hand. 



1 



41 

 13» 



d 



20^ 

 124 

 221 



N°. 1 and 2 are Nossy-Faly specimens of Gelas. Urvillei. 



N°. 3. Paris type of Gelas. Urvillei. 



N°. 4 and 5. Male specimens of Gelas. Dussumieri. 



The proportion of the distance between the external 

 orbital angles, and the length of the cephalothorax is there- 

 fore in Gelas. Urvillei as 25 : 14, in Gelas. Dussumieri as 

 25 : I4V4 or as 25 : 15. 



15. Gelasimus sig natus Hess. 

 (PL 4, fig. 11). 



Gelasimus signatus , Hess , Heitrage zur Kenntniss der Decapoden- 

 krebse Ost-Australiens , 1865, p. 20, Taf. VI, fig. 6. 



Gelasimus signatus , Miers , Report on the Zoolog. Collect, made 

 during the voyage of H. M. S. Alert, 1884, p. 236. 



Gelasimus signatus, de Man, in: Zoolog. Jahrbücher, herausge- 

 geben von J. W. Spengel, M. II, 1887, p. 697. 



Gelasimus bellator, Kingsley, I.e. p. 138, PI. IX, fig. 3. (an etiam 

 Gelas. bellator White?). 



Two adult male specimens from the eastern coast of 

 Australia. As to its general appearance, the cephalothorax 



Notes from tlie Leyden JMuseum, V^ol. X.U1. 



