CARCINOLOGICAL STUDIES. 91 



the hands shows a few impressed longitudinal lines , each 

 of which is bordered by a fringe of very short stiff hairs; 

 on the upper margin two similar lines are observed, 

 between which many very small and rounded tubercles are 

 seen. The inner surface of the palm appears granulated in 

 the middle and below near the lower margin, and those 

 granulated parts are separated from one another by smooth 

 portions. The dactylus is tuberculiferous above and exter- 

 nally and presents three longitudinal furrows, which are 

 bordered by very short stiff hairs. 



The ambulatory legs wholly resemble those of Plag. im- 

 maculata in form and length and the anterior margin of 

 the meropodites is armed in both species with a single 

 acute tooth , a little before the distal end. Whereas , however, 

 the lower surface of the ambulatory legs of Plag. imma- 

 culata is entirely smooth , those of Plag. speciosa are marked 

 with numerous impressed lines , each of which is bordered 

 by a fringe of short stiff hairs ; these lines run transversely 

 on the meropodites, and longitudinally on the carpo- and 

 propodites. The lobes above the bases of the second and 

 third pairs of ambulatory legs are small and dentate. 



The dimensions of these two specimens are as follows: 



(ƒ 9 



Distance between the external orbital 



angles 23 mm. 2072 mm. 



Length of the cephalothorax , the epis- 



toma included 29 » 25 » 



The dimensions of two specimens of Plag, immaculata^ 

 however, are as follows : 



^ 9 



Distance between the external orbital 



angles 14 mm. I6V3 ™°i' 



Length of the cephalothorax , the epis- 



toma included 19» 24 » 



Plagusia speciosa Dana is a very rare species and has 

 hitherto only been recorded from the Paumotu Archipelago. 



ISTotes from the Leyden. ]Museuiii , Vol. XII. 



