1 8( ) 



— - — tnree specimens, — - — two specimens. 



o o 



9 , . 7 + 2 



- two specimens, — - — one specimen. 



o o 



8 + 1 . 7 + 1 . 



— — two specimens, — - — nine specimens. 



4 o 



8 + 2 „ . 7 + ^ 



— - — tour specimens, — - — two specimens. 



o o 



The formiilae present the saine diversity as in the typical for 



m. 



here also the formula — - most tinies occiirs, while — ~ — and 



•J ö 



3 



— 3 — are also not rather rare. In one young male from Brixham, 



ö 



39 mm. long, the rostrum (Fig. !/•) that reaches as far as the 

 terminal spine of the seales and that is straightly and obliquely 

 directed upwards from the orbital margin to the tip, is ariiied 

 above with 12 teeth, beneath with 2 and presents therefore 

 certainly a rare exception : the first nine teeth are typical, 3 on 

 the carapace, the 4th just before the orbital margin, but, in stead 

 of 1 or 2 apical teeth, one observes three small teeth bet ween 

 the 9th tooth and the apex of rostrum, the lOth tooth situated 

 as close to the 9th as to the following. so that these teeth cannot 

 be considered as „apical" teeth. 



We conclude furthermore from these formulae, that, like in the 

 typical form, tlie upper margin is usually armed with eir/hf teeth 

 (in 66 per cent. of the specimens), more rarely with nine (20 

 per cent.) or with sereii (13 per cent.), — that the rostrum usu- 

 ally bears one apical tooth (81 per cent. of the specimens), 

 rarely two apical teeth (6,6 per cent.) or iio apical tooth at all 

 (9,4 per cent.) and that only in 3 specimens the teeth are placed 

 regularly to the tip. In 92 per cent. of the specimens invariably 

 three teeth are placed on the carapace, the 4th just before or 

 just above the orbital margin ; in 7 specimens firo teeth proved 



