CYMOTHOIDEA. 735 



Genus AMPHOROIDEA, Milne Edwards. 



Amphoroidea typica, Edwards. 



Plate 52, fig. 13 a, animal, enlarged ; b, under view of head ; c, 

 under view of abdomen ; d, mandible ; d', profile of its extremity ; e, 

 maxilliped. 



From floating fucus (Macrocystis) near Valparaiso; found about the 

 bases of the fronds, and near the roots. 



Length, nine lines to one inch. Colour, olive-green, often with a 

 browner green line in basal joints of superior antennae parallel with 

 its margin ; also, sometimes in other parts of the body ; in some large 

 specimens a medial longitudinal line along back, white. The lamellar 

 bases of the anterior antennae, in this species, are scarcely as long as 

 their breadth ; the emargination of the caudal segment at its extre- 

 mity is rounded within ; the outer of the lamellae of the caudal appen- 

 dages is broadest at its middle, or just below it; the antero-lateral 

 margin of the caudal segment is straight. Flagellum of second an- 

 tennae about eighteen-jointed, the joints not oblong. 



Amphoroidea australiensis. 



A. typicae affinis. Artictdus antennarum Imarum basalis lamellatus 

 parce oblongus, margine apicali arcuato, angulo externa rotundato. 

 Flagellum antennarum 2darum 20-articulatum. Abdomen postice 

 emarginatum, emarginatione triangulatd, margine segmenti ultimi 

 antero-lateral i paulo sinuoso. Appendices caudales abdomen parce 

 superantes, lamella interna recte truncatd, externa acuminata, angus- 

 tiore quam lamella A. typicae externa. 



Near the A. typica. The lamellar basal joint of the anterior antennae 

 sparingly oblong, the apical margin arcuate, and outer angle rounded. 

 Flagellum of inferior antennae twenty-jointed. Abdomen emar- 

 ginate behind, the emargination triangular; antero-lateral margin 



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