144 



the rostrum resembles the specimens from the Bhick 8ea, in some 

 specimens it runs straightly or almost straightly forwards, but 

 very often the rostrum is distally more or less trending upwards. 

 According to Rathke's description of I\ Fabricü the distal half 

 of the upper margin should be unarmed, entire, as in L. ser- 

 rafiis ; this case, however, does rarely occur among the specimens 

 lying before me, such a form of the rostrum is represented in 

 one of my figures, but I will add that an adult, egg-bearing 

 female from Sebastopol presents quite the same form. 



The males are all of a siiidlhr size than the females, but, of 

 course, this may be fortuitous: the largest male specimens from 

 the Isefjord are hardly 50 mm. long, while the length of the 

 egg-bearing females from this locality varies between 50 and 

 60 mm., but the adult egg-bearing females from Denmark are 

 75 mm. long. Xow I would first call attention to the fact that 

 the antennular peduncle appears, just as in L. Squilla., with regard 

 to the length of the antennal scales, distinctly Io)i(/ér in the mah^ 

 (Fig. 2/) than in the female (Fig. 2/.), or, with other words, 

 that the antennular peduncle reaches farther forwards in the 

 male than in the female, So e. g. in a male, long 48 mm., from 

 the Isefjord the antennular peduncle is 9 mm. long and reaches 

 as far forwards as the terminal spine of the scale, which is 

 10'/^ mm. long; in an egg-bearing female, nearly of the same 

 size, namely 53 mm. long, from the same locality, however, the 

 peduncle is only 8 mm. and the scale 11 '/4 vtim. long, so that 

 the peduncle appears but slightly longer than two-thirds the 

 length of the scale, its distal extremity not by far reaching the 

 terminal spine. Even in the adult, egg-bearing females, long 

 75 mm., from Denmark, in which the antennular peduncle 

 measures four-fifths the length of the scale, the terminal spine 

 is situated just midway between the distal extremity of the 

 peduncle and that of the scale. 



In the Black Sea species the shorter ramus of the outer 

 antennular Hagellum extends, as has already been described, 

 especially in young and middle-sized specimens, rarely also in 



