lÜO CARCINOLOGICAL STUDIES. 



The frout of the male specimen, collected at Padang, 

 is a little broader in proportion to the distance between 

 the external orbital angles than the front of the specimen 

 which was described by Fabricius. The inner surface of the 

 equal hands presents a short granulated crest , composed 

 of five to seven granules , and the dactylus bears thirteen 

 or fourteen oval transverse tubercles. These tubercles are 

 symmetrical and the transverse smooth ridge lies quite in 

 the middle of each; in the Macassar specimen that ridge 

 lies somewhat nearer to the distal end of the tubercle. 



The Japanese male specimen, finally, wholly agrees with 

 the type, but the mobile finger is ornamented only with 

 seven or eight tubercles , and the crest on the inner sur- 

 face of the hands is scarcely distinguishable. I consider 

 this form as a variety: ajffinis de Haan. 



Sesarma guadrata Fabr. is probably a rather rare species 

 and the dimensions seem to be somewhat variable. A large 

 number of specimens from different localities are necessary 

 to make us better acquainted with these varieties. 



31. Sesarma ery thro dactyl a Hess. 



Sesarma erythrodaclyla, Hess, Beitiiige zur Kenntniss der Deca- 

 podea-Krebse Ost-Austvalions , 1865, p. 25, PI. VI, fig. 10. — de 

 Man, in: Zoolog. Jahrbiicher, heransgegeben von J. W. Spengel, 

 Bd. II, 1887, p. 686, and Bd. IV, 1889, p. 436. 



The Leyden Collection contains two young males from 

 Sydney and a third also young male individual from the 

 Pacific Ocean. The number of transverse prominences on 

 the mobile finger of the chelipedes amounts to 23 in the 

 largest, to 25 in the following and to 22 in the smallest 

 specimen. In all these specimens the transverse granulated 

 crest on the inner surface of the hands is very distinct. 

 The outer surface of the palm presents in all , about in 

 the middle, a short minutely granulated transverse line, 

 but I do not know whether this ridge occurs also in the 

 adult or not. The outer surface of the fingers is rather 



Notes from the Leyden Museum, "Vol. XII. 



