546 DR. J. G. DE MAN ON CRUSTACEANS [DeC. 12, 



tooth. The short flagellum of the internal antennse, which is 

 just as long as their peduncle, is serrulate internally, and coalesced 

 for a very short distance, i. e. for 1 of its length, with the outer 

 flagellum. 



The legs of the first pair reach with their chelae beyond the 

 antennal scales ; the chela is a little more than half as long as the 

 carpus. 



The legs of the 2nd pair (figs. 8 and 9) are unequal, the left 

 being a little larger than the other. The left leg (fig. 8), which 

 is somewhat shorter than the body, projects more than half 

 the carpus beyond the antennal scales. The cylindrical merus, 

 that slightly thickens distally, is four times as long as thick. 

 The carpus, which is a little shorter than the merus, has a rather 

 stout, conical shape ; it thickens considerably towards the distal 

 end, appearing here more than tivice as thick as at its base, when 

 looked at from above, and its width at the distal end measures 

 two-Jifths of its length. The chela is somewhat longer than merus 

 and carpus taken together. The palm is nearly once and a half 

 as long as the carpus, and one-fourth longer than the fingers, which 

 are a little curved inward, so that the inner border of the chela 

 appears somewhat concave ; the palm, distinctly broader than the 

 carpus, is someiohat broader than thick, though but very little, the 

 breadth in the middle being in proportion to its thickness as 

 15 : 13, so that it appeals almost cylindrical. About at one-third 

 of its length from the articulation the immobile finger- is armed 

 with a conical tooth (fig. 10), half as high as the finger is broad 

 at this place ; behind it is seen a smaller rounded tooth and, 

 between the latter and the articulation, four or five extremely 

 small and low rounded teeth. The dactylus appears, at its base, 

 a little broader than the fixed finger (fig. 8), and is armed, just 

 in tlie middle, with a slightly curved, conical tooth, which is a 

 little larger than the foremost tooth of the index ; opposite to it 

 on the fixed finger is a small notch (fig. 10), that fits the 

 tooth. Between this tooth and the articulation there are still 

 five or six, much smaller, obtuse, somewhat unequal teeth. The 

 tapei'ing fingers therefore do not shut close together ; between 

 the foremost teeth and the tip the cutting-edge is sharp. The 

 joints of this leg are everywhere covered with innumerable minute, 

 sharp spinules, except on the usual, naked lines ; these spinules 

 are more crowded and a little larger on the outer and on the 

 inner border of the palm and near the finger-cleft on the upper 

 surface, whereas they are less numerous on the rest of the upjjer 

 and on the lower surfaces. They ai'e few in numbei' on both sides 

 of the fixed finger ; on the outei- margin of this fingei- they are 

 also few in number, but lai'ger than on the inner border of the 

 palm. The outer side of the dactylus is thickly beset with 

 slenderei-, larger spinules, the sharp tip of which is cui-ved 

 upward, whereas the inner part of the upper and lower surface 

 is nearly smooth. A few microscopical hairs occur on the outer 

 and inner borders of the chela and of the other joints. 



