145 



adult iiidividuals, oiily by '/„ to '/•> '*^ ^^^ length, the fused 

 jjortion included, beyond apex of' rostrum; in the Scandinavian 

 specimens, on the contrary, the shorter ramus generally projeets 

 hl/ more fJiaii lialf itx loKjfli. tlie fused portion included, beyond 

 apex (»f rostrum, namely by two-thirds to eight-ninths that 

 length and it happens but very rarely that the rostrum extends 

 to the middle — though never beyond tlie middle — of tlie 

 shorter ramus. tlie fused jiortion included. as e. g. in an adult 

 female froin Bergen and in twd otlu-r ones from the Isefjord. 

 The (Hff'c reilt foof/ilii;/ of the rosffiiiH. cinnhhird irith f/ie differoif 

 hfarinij of f lic shorter nniiiis of the oiiter (iiitemiiildr fi/f/el/inii, 

 Hoir iiiiliieex me fo i-ajord tlie Scdii'/liK/rif/ii fonii os o nirietif of 

 L. (tilspersiis IvATJIKK, irliicli^ of eoiirxe. nillsf heor tlie imiite of 

 Fahriri/. According to S. Kemp (1. c. ]>. 12N) the free portion of 

 the shorter ramus slu)uld reacli beyond the apex of tlie rostrum 

 by more than tliree-quarters its lengtli ; in tlie Scandinavian 

 specimens this is 'also often the case, but often also not only the 

 wliole free part of the sliorter ramus but even a part of tlie 

 coalesced portion projeets beyond the rostrum. 



The mandibular palp of the Scandinavian specimens (Fig. 2/) 

 agrees with that of the specimens from the Black Sea, the ter- 

 minal joint is a little more slender, but its forni is somewhat 

 variable, as has already been described above ; the 2'! joint, how- 

 ever, appears in the Scandinavian specimens also somewhat longer 

 with regard to the terminal joint than in S. Kemp's figure 2b (1. c). 



The rostral formulae of the 9 specimens from the Gulf of 



Naples are the following : 



6+1, . 6+1 . 5+1 



— - — three specimens; --v^- two specimens; — - — tour specimens. 



The number of specimens from this locality is too small for 

 drawing any conclusion whether the rostrum is arined, in the 

 Mediterranean species, usually with 5 or with 6 teeth on the 

 upper and with 3 or with 4 on the lower margin : probably, 

 however, the Mediterranean form will prove to agree with that 

 of Scandinavia. for TTkller (1. c.) remarks that the lower margin 



