CETJSTACEA OF THE MEEaUI AECHIPELAGO. 189 



breadtb. of the front being as 11 : 7 ; tbe abdomen of tbe male 

 is a little less enlarged, and therefore completely resembles 

 the abdomen of S. picta, as figured by de Haan, the posterior 

 margin of tbe penultimate joint being a little less than three 

 times as broad as the length of the joint. The hands of the 

 male differ from those of the type by the palm being a little 

 larger in proportion to the fingers, the latter being quite as 

 long as the palm. The hands are a little higher than half their 

 length, the proportion of the latter to the height being as 16| : 9|. 

 The inner edges of the fingers are more strongly denticulated, 

 the immobile finger being armed with three rather strong teeth, 

 and with some smaller teeth at the base. 



The coloration of the hands is also somewhat diiferent from 

 the type. In the latt.er the red colour of the palm extends 

 nearly to the tij) of the fingers ; but in this variety that colour is 

 found only on the palm and at the base of the mobile finger, 

 the fingers being of a yellowish colour. 



Dimensions : — 



.^- 

 millim. 



Distance between the extraorbital teeth lO^ 



Length of the cephalothorax 17^ 



Breadth of the front Ill 



103. Sesaema polita, n. sp. (PI. XIII. figs. 7-9.) 



Six fine specimens (4 d" , 2 $ ) of this interesting species were 

 collected at Sullivan Island. 



Sesarma polita is one of the small number of those represen- 

 tatives of the genus in which the cephalothorax is longer than 

 broad, and with two teeth behind the extraorbital tooth. It 

 therefore appears to be allied to 8. dblonga, v. Mart., from the 

 Philippine Islands, and to some other species. In the form of its 

 legs, thife species more or less agrees with S. atrorubens, Hess, 

 from Sydney, because the anterior legs are short and granular 

 and the meropodites of the ambulatory legs rather slender and 

 not dilated. The dactylopodites are short, thick, tomentose, 

 and not spinulose, as in S. rotundata, Hess. Besides these cha- 

 racters 8. polita may be recognized at first sight by the upper 

 surface of the cephalothorax being extraordinarily flattened and 

 plain. 



The rather thin cephalothorax is longer than broad, the pro- 



