120 
of P. borealis has but 4 joints). "'The' greatest difference, however, 
obtains in regard to the pereiopods. All the'pereiopods are. rather 
Fig. 25. The larva of Pandalus propinguus (2): 
: antenna 1—9 of stage 1—5. 
large; 1st to 3d pairs are deeply cleft, 4th and 5th: pairs have 
only the endopodite. 
Pandalus borealis has no known larval stage totally corre- 
sponding with the'lst stage of the larva from the "Tjalfe"; stage 
2 (Sars 1. e. Pl. 2, figs. 1—3) is the best corresponding, but it has 
