46 CARCINOLOGICAL STUDIES. 



armed with a triangular prominent tooth at 

 the distal extremity; in some specimens the granulated 

 internal margin of this finger presents still a second smaller 

 tooth a little beyond the middle , and a few somewhat 

 prominent granules near the base, but in other specimens 

 only the distal tooth of the dactylus exists. This distal 

 tooth is not found in Gelas. lacteus. The dactylus is only 

 slightly arcuate towards its extremity. The lower finger 

 or index is nearly straight, scarcely directed upwards at 

 the pointed.extremity. The granulated and straight 

 inner margin bears in Gelas. inversus only one 

 single tooth, which lies immediately before 

 the middle, and no teeth exist at the distal extremity; 

 Gelas. lacteus presents also a small tooth a little before 

 the middle , but the inner margin is somewhat arcuate 

 immediately before the tip. 



The inner surface of the palm is highly characteristic 

 of this species. There is namely no trace of the 

 more or less oblique granulated ridge, which 

 in nearly all other species of this genus borders the un- 

 der surface of the palm, proceeding in an oblique direc- 

 tion from the articulation of the wrist to the base of the 

 index, but the internal surface of the palm is, on this 

 place, simply rounded, smooth for the naked eye , very 

 finely granulated when seen under a magnifying glass. 

 In Gelas. lacteus, on the contrary, there is, like in most 

 other species, a prominent oblique granulated crest, defi- 

 ning the under surface of the palm. Gelas. inversus pre- 

 sents , however , one single row of prominent granules 

 near the articulation of the mobile finger, but this row 

 exists also in Gelas. lacteus. For the rest the inner sur- 

 face of the palm and of the fingers appears smooth for 

 the naked eye in both species. 



The ambulatory legs are slender, almost in the same 

 degree as those of Gelas. lacteus : so e. g. the meropodites 

 of the last pair of legs of the latter have a length of 7''/4 

 mm. and a breadth of 2^/5 mm., those of Gelas. inversus 



Notes frona the Leyden Museum, Vol. JKIII. 



