54 CARCINOLOGICAL STUDIES. 



The antero-lateral teeth present the same form and size 

 in both species. The margins of these teeth, of the or- 

 bits and of the front are a little more coarsely granulated 

 in Heterogr. crenulatus than in the other , and the poste- 

 rior margin of the cephalothorax is a little broader than 

 the anterior margin of the front , but in Heterogr. penicillatus 

 the front is distinctly broader than the posterior margin. 



The impressed line on the second joint of the external 

 maxillipedes proceeds closer to the internal margin in the 

 Japanese species than in the other , its distance from the 

 internal margin being a fourth of the breadth of the joint 

 in Heterogr. penicillatus , but two fifths of it in Heterogr. 

 crenulatus , when measured in the middle of the joint. 

 The external margin of the third joint appears more 

 straight and less arcuate in crenulatus than in the other, 

 and is also a little more distinctly emarginate at its posterior 

 end than in penicillatus. 



The carpopodite of the anterior legs oi Heterogr. penicillatus 

 is armed with an acute tooth at its inner angle , but only 

 with a prominent granule in the other. The upper surface 

 is a little more distinctly granulated and the antero-internal 

 surface a little more hairy than in Heterogr. penicillatus. 



The hands have quite the same form in both species; 

 like the wrist they appear smooth for the naked eye, but 

 the fine granulation which they present under a magni- 

 fying-glass , is somewhat more distiuct in Heterogr. crenu- 

 latus than in the other. Nearly the whole inner surface 

 of the palm and of the fingers of Heterogr. crenulatus is 

 covered with hair, but these hairs do not occur on the 

 outer side of the fingers. In Heterogr. penicillatus , on the 

 contrary, the fingers are clothed at their bases with hair 

 on the inner as well as on the outer surface, 

 and the tuft of hair on the inner side occupies only a 

 small part of the inner surface of the palm , extending 

 neither to the upper nor to the under margin. 



The ambulatory legs present about the same form in 

 both species , but the meropodites of Heterogr. penicillatus 



Notes from tte Leyden IMuseuxxi, "Vol. XIII. 



