6 CARCINOLOGICAL STUDIES. 



granulated , the granules being larger towards the lateral 

 margins. The external maxillipedes are uniformly granu- 

 lated and this is also the case with the sternum. The male 

 abdomen is five-jointed and nearly smooth , except the two 

 basal joints; the penultimate joint is nearly quadrate and 

 scarcely shorter thau the breadth of its posterior margin. 



The seven-jointed abdomen of the female is also some- 

 what granulated on the two first joints and on the lateral 

 sides of the two following. 



The anterior legs are especially characteristic. They are 

 equal , both in the male and in the female. The arms are 

 everywhere granulated , and the granules are a little larger 

 on the upper and on the infero-external margins. The wrist 

 is everywhere granulated , and armed with a single tooth 

 at the internal angle. The hands are almost three times 

 as long as high, like in A. Richtersii, but the fingers 

 are comparatively shorter. They measure, in- 

 deed, little more than a third of the length of 

 the palm, and the palm is twice as long as 

 high. The upper margin and almost the whole outer and 

 inner surfaces of the palm are covered with conical gra- 

 nules , which are arranged , at least in the middle of the 

 outer surface, more or less distinctly in longitudinal series. 

 The granules disappear gradually towards the distal end 

 of the outer surface and of the lower margin , somewhat 

 more in the younger male than in the female specimen. 

 A few granules are seen along the distal margin of the 

 outer surface. The granulation evidently extends on a some- 

 what greater part of the outer surface of the palm than 

 in A. Richtersii, and in this species the granules show 

 nowhere a disposition to an arrangement in longitudinal 

 series. The short fingers are feebly dentate, but distinctly 

 excavated at their ends; the upper margin of the 

 dactylus presents two deep longitudinal furrows , and the 

 outer and inner sides of the fingers are also furrowed. 

 The hands have the same form and proportions in the 

 male and in the female , though it ought to be obser- 



Notes I'voai tlie Leydeii Museum, "Vol. XIII. 



