CRUSTACEA OE THE MERGUI AECHIPELAaO. 151 



broader ia the middle than the ischium-joint, and it does not 

 reach to the anterior margin of the merus-joint ; it is broadest in 

 the middle and considerably narrower at the anterior extremity. 

 The outer surface of the joints of the external maxillipeds is 

 punctate; both tbe merus- and ischium-joints are marked with a 

 longitudinal ridge on their outer surface, running close and 

 parallel to the internal margins. The outer surface of the 

 exopodite is conyex. 



The abdomen of the male is rather narrow, and its lateral 

 margins are nearly parallel, scarcely converging towards the 

 terminal end. The two basal joints do not occupy the whole 

 width of the sternum between the bases of the legs of the last 

 pair. The third and fourth joints are nearly three times as long 

 as broad, and have the same length ; the fifth and the sixth are 

 as broad as the two preceding joints, and are successively a little 

 longer ; the terminal joint is rounded at the tip and its pos- 

 terior margin is nearly as broad as its length. The female 

 abdomen is much broader than that of the male and fringed, 

 along the lateral margins, with hairs ; the lateral margins of the 

 joints are slightly arcuate. The outer surfaces of the sternum 

 and of the abdomen are slightly punctate. 



The chelipedes of the largest specimen ( 5 ) are somewhat 

 unequal, the left leg being slightly the larger. The ischiopodites 

 are armed with two or three minute acute tubercles on their 

 anterior margin. The arms scarcely project beyond the lateral 

 margins of the cephalothorax ; their outer surfaces are somewhat 

 transversely rugose, and the margins are covered with some 

 more or less acute granules. The upper surface of the wrist is 

 covered with some minute granules, a few larger ones being found 

 near the internal margin; the internal angle of the wrist is 

 armed with a small acute tooth, and oue or two smaller teeth are 

 found immediately below it. The larger hand is scarcely twice 

 as long as high, and the fingers are nearly as long as the palm ; 

 the latter has a tolerably convex outer surface and the under 

 margin is also convex. The outer surface, which appears smooth 

 to the naked eye, is marked below with a rather coarsely 

 granulated or minutely denticulated longitudinal line, proceed- 

 ing close and parallel to the under margin of the palm, to 

 the tip of the immobile finger. One or two minute acute 

 tubercles or granules are found on the outer surface near the 

 middle of the distal margin of the palm, i. e. a little below the 



