SHRIMPS FROM THE MARSHALL ISLANDS — CHACE 7 



mens examined, these numbers vary from three to nine, and appear 

 to increase with specimen size. 



The relative numbers of males and females in this collection do not 

 bear out Armstrong's suggestion (1941, p. 1) that a submerged light 

 may exert a greater attraction for males than for females. Including 

 89 males and 121 females and juveniles, of which 4 are ovigerous, that 



Table 1. — Variation in dentition on fingers of second chelae of specimens o/Leptochela 

 robusta from Bikini Lagoon 



Fixed 



Denticles fingers Dactyls 



24 1 



25 2 



26 2 



27 



28 1 2 



29 10 



30 2 



31 2 12 



32 1 13 



33 1 11 



34 1 10 



35 6 11 



36 3 12 



37 8 6 



38 10 2 



39 8 2 



40 11 1 



41 10 1 



42 7 



43 5 



44 10 



45 6 



46 4 



47 3 



48 1 



49 



50 



51 1 



52 



53 



54 1 



were sexed of the lot of 2,750 specimens taken in Bikini lagoon on 

 April 23-25, the sexed individuals of the entire collection amount to 

 195 males and 361 females and juveniles, of which 12 are ovigerous. 

 The small number of egg-bearing females suggests that the eggs 

 usually are produced at some other season of the year or that ovigerous 

 specimens are not attracted by a submerged light as are females 

 without eggs. 



