PEN^EIDEA. 611 



sidered the first of the larger flagellum, though different and distinct 

 from any following, is quite short, and nearly as broad as the pre- 

 ceding. The longer flagellum is rather stout below. Scale of outer 

 antennae pointed, but not acute, long ciliae on inner and apical margin, 

 last three basal joints very slender (fig. 10 c). 



The mouth organs are a pair of mandibles, two pairs of maxillae, 

 and one of maxillipeds. The mandibles narrow towards a dentate 

 apex ; they have a long palpus which is somewhat hairy ; the last 

 joint obtuse and hairy, and besides short pectinate, with spinules on 

 inner side. The first maxillae have a stout base and are narrow above, 

 and with a tuft of short setae at apex. The second maxillae are broad 

 foliaceous in several lobes, with the margin hairy. The maxillipeds 

 have an oblong transverse base narrowing outward, bearing towards 

 outer extremity an oblong ciliate cultriform lamella, and at inner apex 

 a five-jointed termination, broad and compressed, the third of these five 

 joints largest, the last narrow and acuminate ; the two leave a broad 



oval space between them, the tips being in contact and so also the 

 bases. 



The six anterior legs have a long and narrow imperfect hand, the 

 terminating claw folding on outer half of inner surface. Joint pre- 

 ceding the hand longer than the hand ; this branch of the legs hairy 

 on inner side. Natatory branch about two-thirds as long as the other, 

 consists of an oblong basal joint, and a flexible multiarticulate extre- 

 mity, which is hairy. Following four pairs very slender and long 

 [they were partly broken in the specimen]. Branchiae attached to 

 base of thoracic legs irregularly foliaceous in many folds. 



