SU oe 
Polyphemus pediculus. Swimming feet. 
Ofryoxus gracilis, First foot. 
Macrothrix nova-mexicana. 
Female. 
End of post-abdomen. 
Antennule. 
Leydigia quadrangularis. First foot. 
Osphranticum lJabronectum. 
Antennule. 
Fifth foot of female. 
