GARCINOLOGICAL STUDIES. 29 



as the widtli of the cephalothorax , and a similar specimen 

 has been figured by de Haan , but in the other type spe- 

 cimen the larger hand is scarcely more than once and a 

 half as long as the distance between the external orbital 

 angles. The hand is rather elongate, but the comparative 

 length of the fingers is as much variable as the length of 

 the hand itself. In the specimen figured by de Haan the 

 fingers are twice as long as the palm and considerably 

 gaping, the dactylus being strongly arcuate. In the other 

 specimen the little gaping fingers are slightly more than 

 once and a half as ong as the palm ; the upper finger is 

 straight, the larger hand presents some resemblance to that 

 of Gelas. vocans M. E. The outer surface of the palm is 

 coarsely granulated, the granules being largest towards 

 the slightly concave base of the immobile finger. In Gelas. 

 vocans the immobile finger is more distinctly concave at 

 the base than in the species of de Haan and almost quite 

 smooth , whereas in Gelas. arcuatus it is also covered with 

 granules. In both species the upper border of the palm is 

 distinctly margined. The fingers have nearly parallel mar- 

 gins in the specimen figured by de Haan, and they are 

 tapering only near the extremities ; but in the other spe- 

 cimen they are regularly tapering towards the tips. Both 

 fingers are longitudinally furrowed on the middle 

 of their outer surface , whereas the mobile finger of Gelas. 

 vocans and of Gelas. tetragonon is never furrowed on its 

 outer surface. 



The iriuer margin of the lower finger presents a more 

 or less promineut tooth a little before the middle in the 

 specimen similar to that which was figured by de Haan , 

 and a second less prominent one a little before the extre- 

 mity ; in the other specimen, with shorter hand, the first 

 tooth stands almost in the middle of the margin. The 

 small tooth which in Gelas. vocans is observed at the base 

 of this finger , does not occur in Gelas. arcuatus. The 

 dactylus or upper finger appears somewhat granulated at 

 the base; its inner margin is armed in the specimen with 



JVotes iroin the Leyden. Museum, Vol. XIII. 



