176 



Confer: F. Doflein, Lebensgewolmheiten und Anpassungen bei 

 dekapoden Krebsen, Jena 1910. 



17 specimens, one of which is egg-bearing and fuU-grown, wliile 

 the others are yoiinger and of different size, from the Gulf of 

 Naples, received from the Zoological Station. 



The ova-bearing female is 74 mm. long. The rostral formulae 

 of IG specimens are the following : 



7 +1 . ., . 7+2 



— - — eight specimens, — j — one specimen. 



7+2 . 7+1 



— - — one specimen, , — one specimen. 



6+1+1 . 6+1 



~ one specimen, — - — two specimens. 



5 o 



6+1+1 . 6+1 



one specimen, ^ one specimen. 



7+1 

 The most common formula is --- — , sometimes the foremost 



o 



tooth is situated more forward. In 13 of 16 specimens the upper 

 margin is armed with seven, in 3 only with six teeth, not coun- 

 ting the apical tooth ; in 2 specimens tivo apical teeth are observed, 

 in the rest only one. Two teeth are invariably placed on the 

 carapace, the 3^ immediately before it, the 2'i tooth is about one 

 and a half as far distant from the l^t as from the 3^. In 12 of 

 16 specimens, i. e. in 75 per cent., the lower margin is armed 

 with five, in 4 with four teeth. In most specimens the rostrum 

 fully agrees with IIeller's figure. 



The shorter ramiis of the outer flagellum, which in most spe- 

 cimens is fused to the longer for one-^fth its length, rarely for 

 one-foiirth or for one-sixth, as in the adult ova-bearing female, 

 reaches in all the specimens beyond the apex of the rostrum, 

 but the portion that reaches beyond it, varies from 1,5 to 5,5 mm., 

 in one specimen, long 56 mm., the shorter ramus reaches even 

 only 0,6 mm. beyond the rostrum: sometimes just half the 

 shorter ramus reaches beyond the rostrum, in otlier specimens 



