b. Dorsal striæ and cilia absent; Genus *_Chilodon_
posterior end not pointed

c. Dorsal striæ and cilia absent; Genus _Scaphidiodon_
posterior end pointed

5. a. Caudal spine with posterior 6
bristle-like cilia

b. Caudal spine without posterior Genus _Trochilia_
bristle-like cilia;
ventral cilia reduced

6. a. With pigment spot on anterior Genus _Ægyria_
angle

b. Without such pigment spot Genus _Onychodactylus_

c. Cilia on right edge only of Genus *_Dysteria_
greatly reduced ventral surface

* Presence at Woods Hole indicated by asterisk.


Genus NASSULA Ehr. '33

(Dujardin '41; Stein '67; Cienkowsky '55; Cohn '66; Clap. et Lach.
'58; Kent '81; Maupas '83; Entz '84; Fabre-Domergue '88; Bütschli
'88; Shevyakov '96.)