167 



Calais. Except the two froni Rovigno, the females of this collection 

 are not egg-bearing. One female, long 68 mm., from Le Portel is 

 infested by a Bopyrus at the right side of the carapace and anothcr, 

 long 46 mm., from Brixham bears two Bopijyi^ at either side one. 

 The rostral formulae of 48 specimens show a rather great 

 diversity and are the following: 



8+1 . 7+2 



— - — one specimen, — - one specimen. 



8 + 1 , . 7 + 1 



— j^ — two specimens, — - — ten specimens. 



7 + 1 + 1 . 6+2 ^ 



one specimen, — - — two specnnens. 



b D 



7 + 1 + 1 , . 6 J- 1 „ 



— ■ — two specimens, — — - four specimens. 



6+1+1+1 . 6+1 



one specimen, — — two specimens. 



7+2 . 6+1 



— :^ — one specimen, -- — one specimen. 



7 +1 . ^ . 5 + 1 



— - - nineteen specimens, — - one specimen. 



o o 



The most common formiila proves to be — - —, less often — - — . 



In 31 of the 48 specimens, i.e. in 65 per cent., the upper margin 

 is armed with seven teeth, not counting the apical tooth or teeth ; 

 in 7 specimens, i.e. in 15 per cent., with eight^ in 9, i.e. in 19 

 per cent., with s/.r and in an adult male, long 83 mm., from the 

 Straits of Calais only with five teeth. In the larger female from 



Rovigno with the formiila and in two adult specimens 



from the Straits of Calais with 8 teeth on the upper margin the 

 foremost tooth is placed on the unarmed part of the upper margin, 

 about midway between the 7ih tooth and the apex of the rostrum 

 and in a specimen, long 80 mm., from the same locality, even 

 two teeth are placed on the unarmed part of the upper margin 

 at some distance from one another, the S^^ tooth being situated 

 rather close to the apical tooth. In 44 specimens, i.e. in 92 per 



