i8 



here 0,5 mm. thick and 0,3 mm. at the base, the greatest thickness being one-fourth its length ; 

 the penultimate joint which is just as long as the carpus, appears in a lateral view a httle 

 thicker proximally than at the .distal extremity. Viewed at from above, the carpus appears 

 broader and shows the sanie width along its total length : the propodus appears then also 

 wider than in a lateral view, but this joint is suddenly narrowed near the distal extremity. The 

 dactylus is just half as long as the carpus and the spine at the distal end measures two-thirds 

 its length ; its form is elongate, rhomboidal, almost half as wide as long, it is twice as wide 

 at the base as at the tip and it is slightly distorted. 



In the i"" pair of legs the chela is a trifle longer than the carpus and the carpus 

 measures two-thirds the length of the merus; fingers a trifle shorter than the palm. In the 2°'^ 

 pair the merus is a little longer than the carpus and the carpus one-third longer than the 

 chela; palm one and a half as long as the fingers. Both the legs of the i*' and of the 2"^^ 

 pair bear a sharp tooth at base. Merus of y^ legs a little longer than the carpus, which is 

 almost twice as long as the chela, fingers as long as the palm. In the 4* and in the 5"' legs 

 the propodus appears a little shorter than the carpus ; the merus of the 4* is one and a half 

 as long as the propodus, but that of the 5* only one-tenth; dactylus one-fifth respectively 

 one-sixth shorter than the propodus. 



Measurements of the five pereiopods of the male in millimeters : 



l^t leg 



2nd leg 



jth leg 



4th leg 



51:1 leg 



Length of the merus 



Width ') of the merus 



Length of the carpus 



Width of the carpus 



Length of the propodus .... 



Width of the propodus 



Length of the chela 



Proportion between length and width of the chela . 



Length of the fingers 



Length of the dactylus 



Proportion between the length of the dactylus and its 

 width at the base 



3.3 

 1,06 



2,2 

 0,66 



2,4 



4,6 

 1,12 



3>3 

 0,63 



2,8 

 o,4S 



2,12 

 4,2 

 0,85 



4,3 

 0,38 



4 

 0,25 



2,25 



5 

 1-15 



4,95 



0,34 



3>S 



0,18 



3'5 

 0,16 



2,66 



22 



4,1 

 0,28 



0,16 



3-7 

 0,14 



3,12 

 25 



Petasma large, 4 mm. long and 4,5 mm. broad at its insertion on the pleopods ; it is 

 strongly curved. The petasma (the two branches taken together) terminates distally in two 

 large triangular, obtuse lobes, separated by a semicircular, median incision, and two smaller, 

 lateral lobes, separated from the former by a more narrow and deeper notch ; each lateral 

 lobe ends in a narrow tooth or spine, that is curved ontward and backward and the tip of 

 which is truncate. Behind each lateral lobe one observes on the upper (anterior) surface of the 

 petasma a subacute, depressed, even slightly concave tubercle. At each side of the median 

 line and close to it are two tubercles situated behind one another; the posterior is longer 



j) Measured in the middle. 



18 



