72 CARCINOLOGICAL STUDIES. 



second. The endostome is distinctly ridged. The merus- 

 joint of the outer foot-jaws (fig. 6c) is as long 

 as it is broad at base; its anterior margin as 

 well as the anter o-ex ter nal angle is rounded 

 and the external margin very slightly concave. 

 The penultimate joint of the palp is only a little shorter 

 than the terminal joint, and the exognath reaches almost 

 to the rounded antero-external angle of the merus-joint. 



The pterygostomian regions, the sternum and the ab- 

 domen are smooth and glabrous. The sternum is almost 

 as long as broad and the two anterior segments are 

 coalescent. The abdomen of the male (fig. (5d) resembles 

 that of Geryon longipes A. Milne Edw. as regards its 

 outer form ; it is seven-jointed , all the sutures being dis- 

 tinct , but the third , fourth and fifth segments seem to 

 be coalescent and immobile. The two first segments cover 

 the whole width of the sternum between the bases of the 

 fifth ambulatory legs ; they are less broad than the third 

 segment , which is the broadest of all. The fourth , fifth 

 and sixth segments are subequal in length , the lateral 

 margins of the penultimate segment slightly convex. The 

 form of the terminal segment differs a little in our spe- 

 cimen and in that of the Berlin Museum. In our specimen 

 it is broadly triangular, the length measuring only 

 two thirds of the breadth at base; the lateral margins are 

 very slightly concave and the posterior margin occupies 

 exactly the anterior margin of the penultimate segment. 

 In the specimen of Berlin the terminal segment is com- 

 paratively less enlarged and more narrowed anteriorly, the 

 lateral margins being more distinctly concave ; the length 

 measures four fifths of the breadth at base , and the pos- 

 terior margin is a little shorter than the anterior margin 

 of the penultimate segment. 



The anterior legs are moderately robust and the right 

 leg is a little larger than the left, as in the specimen of 

 Herbst. The upper margin of the arms bears a very small 

 spiniform tooth at some distance before the distal end ; 



Notes from tUe Leyden JMuseum, "Vol. XII. 



