155 



aiul tliat part of the rostrum whicli is sitiiated below the lateral 

 crest, is miicli higher thau that above it. 



Among the 206 specimeus, coUected in Jaiuiary 1915 off 

 Willemstad, 4 males and 4 females occiir, the rostrum of which 

 presents more or less abnormal peculiarities. In the first male, 

 long 64 mm., the rostrum attains only the middle of the 

 3<i joint of the antennuhir peduncle and extends almost straight 

 forward, tliough a line uniting the apices of the tecth of the 

 upper margin is slightly ascending; tlie extremity of the rostrum 

 is rounded, but armed with 2 teeth, of which the lower is slightly 

 longer than the upper, and the lower margin is armed with 3 

 teeth. There are 6 teeth on the upper margin, of which 2 are 

 on the carapace as usual, while the 2*^ is but little farther 

 distant from the l^t as from the 3^; the distances between the 

 following teeth slightly increase in length and the 6tb tooth is 

 as far distant from the 5^^ as from the lower tooth at the 

 rounded extremity of the rostrum. 



In the second male, which measures 60 mm., the rostrum, slightly 

 ascending and reaching only 1 mm. beyond the antennal scales, 

 is armed above with 9 teeth that extend to near the tip, so 

 that there is no apical tooth ; 2 teeth are on the carapace and 

 the 2d is not yet one and a half as far distant from the l^t as 

 from the 3^, but this specimen is conspicuous by a smooth un- 

 ariiied interspace between the b^^ tooth which is situated on the 

 middle of the free part of the rostrum and the 4:^^ tooth ; 

 this unarmed interspace is but little shorter than the distance 

 between the l^t and the 4^^ tooth ; lower margin 4-dentate. 



In the third male, 56 mm. long, the rostrum, slightly ascending 



6 + 2 

 and hardly reaching beyond the scales, is - dentate. The 



two apical teeth, which are situated close together, are of au 

 extraordinarïly small size and one observes furthermore a smooth 

 interspace between the 3^ and the 4th tooth of the upper margin, 

 so that the 3^ tooth appears as far distant from the l^t as from 

 the 4th. 



