CRUSTACEA OF THE MERaUI AECHIPELAGO. 141 



its outer surface is smooth, and presents an arcuate piliferous 

 line, proceeding from the middle of the external margin towards 

 the internal half of the anterior margin. The latter, which 

 forms the commissure between the merus-joint and the ischium- 

 joint, is transverse (not oblique, as in Scopimera globosa and 

 S. tuberculata) and straight, though a little concave towards the 

 internal angle, which projects slightly more forward than the acute 

 external angle. The internal and external margins of the ischium- 

 joint are also slightly concave. The merus-joint is a little longer 

 than the ischium-joint, and presents the same form as in the genus 

 Dotilla {sensu stricto). The external and internal margins are 

 arcuate, convex, and convergent anteriorly, so that the anterior 

 margin of the joint is very short ; this anterior margin is slightly 

 concave, and bears the palpus near the external angle. Except 

 a narrow, shallow, longitudinal impression which proceeds close 

 and parallel to the external margin, the outer surf ace of this joint 

 appears quite smooth, and without any trace of the grooves that 

 characterize the species of Dotilla. 



The male abdomen is narrow, and is similar to that of some 

 other species of this group, the fifth (or antepenultimate) joint 

 being mu<5h constricted near its base. The very short first seg- 

 ment occupies a little more than half the width of the sternum 

 between the bases of the last pair of legs ; the second segment 

 is a little less broad, but slightly longer ; the third segment is 

 the broadest of all, being a little broader than the first, 

 slightly longer than the first two joints taken together, and its 

 lateral margins are arcuate ; the fourth is as long as the third, 

 but a little less enlarged ; the fifth joint is about once and 

 a third longer than the fourth, and a little narrower, and pre- 

 sents a characteristic constriction near the base; the sixth or 

 penultimate joint is a little longer and broader than the fifth, 

 and almost quadrate ; while the terminal joint is as long as the 

 fifth, and rounded at the tip. The lateral margins of the abdo- 

 men are fringed with short hairs ; its outer surface, liJse that of 

 the sternum, is quite smooth and glabrous. The female abdomen 

 presents the ordinary form. 



The anterior legs of the male are equal or sometimes rather 

 unequal. They are similar to those of Selcecius ; but the fingers 

 have acute tips. The chelipedes are large and long, measuring 

 about tliree times the greatest width of the cephalothorax. 

 The basipodites and ischiopodites are smooth and unarmed. 



