34 CARCINOLOGICAL STUDIES. 



Length of the larger hand 53 mm. 



Height of the palm 21 » 



Length » » » 24 » 



14. Gelasimus Urvillei M. E. 



Gelasimus Urvillei, H. Milne Edwards, I.e. p. 148, PI. Ill, fig. 10. 

 Gelasimus Dussumicri, Hilgendorf, in: Baron von der Decken's 

 Reise in Ost-Africa , Crustaceen , p. 84, Taf. IV, fig. 1. 



Three probably adult males, collected by Messrs. Pollen 

 and van Dam on the Island of Nossy-Faly. 



Prof. Milne Edwards enabled me to study the original 

 type-specimen of this species , which was discovered at 

 Vanicoro , and which has been figured by his father. 



The three Nossy-Faly individuals , which have been 

 described by Hoffmann as (re/a.s. i^usswrnzm , perfectly agree 

 with the Paris type , and belong evidently to the same 

 species. They are, however, considerably larger than the 

 Paris type, which is a rather young specimen. 



Hilgendorf has published a very good figure of Gelas. 

 Urvillei, for the specimens referred by him to Gelas. Dus- 

 sicmieri, evidently belong to Gelas. Urvillei. I refer there- 

 fore to those figures. 



The nearest ally of this species is indeed Gelas. Dussumieri 

 M. E. It differs firstly by the shape of the cephalothorax, 

 which is a little shorter in proportion to the 

 distance between the external orbital angles; 

 the cephalothorax appears therefore slightly more enlarged 

 anteriorly. In the second place the lateral margins 

 are more oblique, so that the upper surface of the 

 cephalothorax appears a little more narrowed backwards. 

 The walls of the orbits are constantly ornamented near 

 their inferior margin with an accessory row of small 

 granules: 1 observe about ten or eleven granules 

 which are placed near the middle portion of the lower 

 margin of the orbits. 



The anterior legs of the male quite resemble those of 

 I<fotes from the Leyden JMuseum, "Vol. XIII. 



