9 



pereiopoda expands as in P. affinis. External margin 

 of the lateral plates of the thelycum raised to a 

 ridge. Distal end of the inner lamina of the petasma 

 is large and convex and nearly covers the distal end 

 of the outer lamina. Rostrum serrated to its apex, 

 8 dentate. Narrow, irreguler grooves in the shell 

 which are thickly beset with setae. 



P. incisipes. 



7. Lateral plates of the thelycum convex. Anterior 

 end of the internal lamina of the petasma long, 

 narrow and curved dorsally. Apex of the rostrum 

 slender and devoid of teeth. Rostrum 7 dentate. 

 Shell beset with setae. 



P. jfoyneri. 



b. First pereiopoda bispinose, second and third unispinose. 

 Walls of the seminal receptacle calcified and its cavity 

 divided by a median septum. Tail segment armed. 



8. With irreguler pubescent furrows. Rostrum 9 

 dentate. 



P. intermedins 



c. Second joint of the first and second pereiopoda 

 unispinose. Seminal receptacle consists of two entirely 

 separate cavities. Carapace with a pair of fissures. 

 Peduncle of the second pair of antennae with a tooth. 



9. Carapace smooth and naked. Rostrum short, 

 slightly longer than the eyes. No gastric tooth on 



