137 



In the speoimt'iis f'roni Kovigiio the rostrum has the same forni 

 as in thusc from the Black 8ea and the toothiiin'-forniuhie uf 16 

 individuals are the following- : 



9 + 1 , . f + 2 



— - — three specimens, — ~- one specimen. 



o o 



8 + 2 ^ . 7 + 1 



— .j two s])ecimens, - — - — two specimens. 



o o 



3 n 



8+1 . 7+1 



— - — se ven specimens, -~ one specimen. 



8 + 1 

 Tlie formuhi - here a^'ain most times occurs. In more than 



half the nuinber of tlie specimens, in 50 per cent., the upper 

 margin is armed with ei(//if teeth, in 25 per cent. with neL-cn, 

 and ithic teetli are only observed in 3 specimens. In one young' 

 individual the lower margin presents tiro teeth, in all the others 

 fhree'^ in 81 per cent. of th(i specimens therc; is one apical tootli, 

 in 19 per cent. two apical teeth occur. In the small egg-bearing 

 specimen from Kovigno not only three teeth are situated on the 

 carapace, but even the 4'1' arises still from it, its apex, however, 

 distinctly reaches beyond the orbital margin ; in the larger spe- 

 cimens the 4tli tooth is just placed over the orbital margin, in 

 the yoimger individuals just bef ore it. In the ova-bearing spe- 

 cimen the fst tooth is one-fourth farther distant from the posterior 

 than from the anterior margin of the carapace, this is also the 

 case in the other specimens or at the utmost the distance from 

 the posterior margin appears one and a half as long as the 

 distance from the anterior or little more. 



S — - 1 

 In the 5 specimens from Naples, finally, the rostrum is — ^ — 



dentate, in one specimen the 4tl' tooth arises still from the cara- 

 pace, but tlie apex projects beyond the orbital margin, in 3 spe- 

 cimens the 4tli tooth is situated just over the orbital margin and 

 in the last specimen immediately before it; in these 5 specimens 

 the distal half of the rostrum is ratlier strongly trending upwards. 



