50 CARCINOLOGICA.L STUDIES. 



The Leyden Museum contains also an adult male of this spe- 

 cies, from the Gulf of California. This specimen , the cephalo- 

 thorax of which has a length of 63 mm., fully agrees 

 with the specimens from the Bahama Islands and the An- 

 tilles, but the coloration is somewhat different. The upper 

 surface of the cephalothorax has , especially on the gas- 

 tric and branchial regions , a violet colour and the pale 

 spots are much less numerous, more distinctly defined 

 and not confluent. The anterior legs as well as the am- 

 bulatory ones are • of a bright red , more or less mixed 

 with yellow , especially on the posterior legs, and the pale 

 spots are here also few in number and not confluent. 



24, Se s a rm a Büttikoferi de Man. 



Sesarma Büttikoferi, de Man, in: Notes frono the Leyden Mu- 

 seum, Vol. V, 1883, p. 163. 



A male and a female from the Junk River, Liberia. 



The male specimen is of a somewhat larger size than 

 the original type-specimen described by me in 1883. As 

 to the female, I observe that the hands are comparative- 

 ly much smaller than those of the male. In the adult 

 male the palra projects considerably outward beyond the 

 carpus, and the fingers measure only a third of the whole 

 length of the hand , the palm being twice as long as the 

 fingers. In the female , however , the fingers are still a 

 little longer than the palm and the latter is not at all 

 produced outward beyond the carpus ; but the outer sur- 

 face of the hands is flattened as in the male , and the 

 other characters are also nearly the same. 



Measurements : cf Q 



Distance between the external orbital 



angles IS^/g mm. ll^/g mm. 



Length of the cephalothorax . . . 12\'5 » 9% » 

 Breadth of the upper margin of the 



front 91/3 » 7 » 



Length of the hands 15 » 6V4 » 



Notes from tlie Leyden IMuseutn, Vol. XIII. 



