174 | Dr. Wilh. Giesbrecht on 
men of 9 3- or 4-, of ¢* 4- or 5-jointed ; genital aperture 
lateral ; furea with 6 sete. Anterior antenne of ? 8- to 21- 
jointed, withasingle zsthetask (sensorial appendage); clasping- 
antennz of ¢ 10- to 17-jointed, with one or several esthetasks. 
Posterior antenne prehensile, 4- or (rarely) 3-jointed; exopodite 
1-jointed. Mandible-palp 1-branched (1- or 2-jointed) or 
wanting. Maxilla 2- or (rarely) 1-lobed. Anterior and 
posterior foot-jaws strong prehensile organs. First four pairs 
of feet swimming-organs; their exo- and endopodites in 
general 3-jointed (sometimes both branches of first pair 2- 
jointed, inner branch of fourth pair 2-jointed or wanting). 
Fifth pair of feet rudimentary, 2 jointed (first joint often 
coalescent with fifth thoracic segment), or (rarely) setiform. 
Sexes differ in size and form of body, in segmentation of 
abdomen (¢ having one segment more than ? ), and in form, 
segmentation, appendages, and function of anterior antenne. 
Subfamily 1. Ascomyzorrrvaz, nov. 
Anterior antenne of ? 11- to 21-jointed; the ssthetask- 
bearing joint followed by 2 or 3 apical joints; clasping- 
antenne of ¢ 17- (Cyclopicera, Asterocheres), or 16- (Acon- 
tiophorus ornatus), or 13- (Dermatomyzon) jointed, rarely 
(Acontiophorus) with additional zsthetasks. Mandible with 
palp. Maxilla consisting of a short basal joint and two lobes, 
each bearing 3-5 sete. Last joint of outer branch of third 
and fourth feet with 3 or 4 sets at inner margin. ‘Thoracic 
segments laterally rounded off, rarely produced into lateral 
processes. Abdomen of ¢ 38- or 4-, of g 4- or 5-jointed. 
Siphon usually without, sometimes with, suctorial tube. 
Inner branch of fourth foot normal, similar to the inner 
branches of preceding feet. ‘Terminal joint of fifth foot oval 
or elongated. 
Genus 1. CycLopicerA, Brady, 1872 t. 
Thoracic segments laterally rounded off. Rostrum flat. 
Abdomen of ? 38-, of ¢ 4-jointed. Anterior antenne of 9 
21-, of g 17-jointed ; with one esthetask in both sexes. 
* Males are known of Cyclopicera echinicola, violaceum, minutum, Der- 
matomyzon elegans, Asterocheres Lalljeborgit, Clawsomyzon gracilicauda, 
Acontiophorus ornatus, Dyspontius sp. I have also examined males of 
Cyclopicera echinicola, Bradypontius chelifer, Pteropontius cristatus, Gallo- 
pontius fringilla, Dyspontius Thorellii, capitalis, and brevifurcatus. 
+ According to Canu the genus Jsopodius, Kriczagin (Mitth. nat. Ver. 
Kiew, vol. ili. p. 898, t. xiv.), is probably a synonym of Cyclopicera. I 
have not seen Kriczagin’s work, which is written in Russian, 
