153 



were observed, biit in 16 of these 25 specimens there was no 

 apical tooth, the nine teeth extending here until to the apex. 

 Only in 5 specimens the upper margin presented six teeth and 

 in the 3 with ten the teeth reached to the tip; in 4 specimens 

 the rostrum was armed with eleven teeth, but in 2 of them there 

 was no apical tooth, the teeth reaching again to the apex. This 

 was also the case in the 3 specimens, the rostrum of which 

 carried twelve teeth. 



In 254 of the 378 specimens, i. e. in 67 per cent., the lower 

 margin proved to be armed with four teeth, in UI, i. e. in 29 

 per cent. with three] only in 8 specimens five teeth were ob- 

 served and only in 4 six. One of these 4 specimens, with the 



formula ., , is a young female, long 38 mm., in which the rostrum 



shows abnormal features; the rostrum, indeed, hardly reaches the 

 distal end of the anteunular pedunclo, the upper margin appears 

 in the middle rather strongly convex, so that the rostrum is much 

 broader or higher than usual and the teeth reach to near the 

 tip. In one specimen that was captured off Willemstad on the 

 Hollandsch Diep, the lower margin was armed with seven teeth, 

 the 3<1 of which, however, was in a rudimentary condition. 



We furthermore establish the fact that in 159 of the 378 

 specimens, i. e. in 42 per cent., two apical teeth exist and in 186, 

 i. e. in 49,2 per cent., only one] in 2 adult females from the 



o I o 



Hollandsch Diep, the rostrum of which is ~ -"p-- toothed, three 



apical teeth were observed, a very rare exception indeed, and iu 



7 4-0 

 the specimen with the formula — j — there was no apical tooth 



at all and the foremost (7^1^) tooth of the upper margin was rather 

 far distaut from the apex. In 30 of the 378 specimens, i. e. in 

 about 8 per cent., the teeth of the upper margin are placed 

 until to the tip, but almost half of them are young individuals. 

 We may therefore conclude from these observations that the 

 upper margin is usually armed with seoen teeth besides the apical 

 tooth or teeth, less often with elght^ that the lower margin is 



