120 
of P. borealis has but 4 joints). The greatest difference, however, 
obtains in regard to the pereiopods. All the pereiopods are rather 
large; lst to 3d pairs are deeply cleft, 4th and 5th paiis ha\e 
only the endopodite. 
Pandalus borealis has no knovvn larval stage totally cone- 
sponding with the lst stage of the larva from the “Tjalfe ; stage 
2 (Sars 1. c. PI. 2, figs. 1—3) is the best corresponding, but it has 
