CRAYFISHES — HOBBS, HOLT, AND WALTON 



33 



merited second antenna bearing only two terminal claws: .(2) the 

 gravid <>r triunguis female, which frequently contains eggs and may 

 be recognized by the apparently 5-segmented antenna bearing three 

 terminal claws. 



Figure 7. — Entocythcrids: a, generalized peniferum illustrating structures mentioned in key; 



b, terminal claws of antenna of female Entocythere inlernotalus. Lateral views of shells: 



c, female Ascelocylhere asccla; d, female Donnaldsoncythere scalis; e, female Dactylocylhert 

 chalaza; }, male Dl. daphnioides. Peniferum: g, Ankylocylhcrc ancyla. Aniicula and 

 J-shapcd rods: h, Dt. suteri; i, Dl. chalaza; j, Dl. falcala; k, Dt. daphnioides. 



Unfortunately, few female entocytherids can be identified unless 

 they are found in amplexus or can definitely be associated with Hie 

 male. Few generic determinations <>f females are possible; however, 



2 1 1 778 07 A 



