2!0 PROCEEDINGS OF THE NATIOITAL MUSEUM. vol.60 



This family is chiefly parasitic upon salt-water fish, but a few 

 species, like the one for which the family is named, are found upon 

 fish that enter fresh water. 



KEY TO SUBFAMILIES AND GENEEA. 



1, One or more body regions furnished with plates or wings, or both. 



Anthosominae. 2 



1. No plates or wings on any body region 5 



2. All the swimming legs replaced by lamellar plates 3 



2, The two anterior pairs of legs of the usual biramose form, the posterior pairs 



sometimes modified 4 



3. Cephalothorax with a divided carapace; swimming legs represented by three 



pairs of large wings Anthosoma Leach, 1816, p. 23 



3. Free thorax and abdomen covered with separate dorsal plates; swimming 



legs fused into a single plate Norton Nordmann, 1864, p. 26 



4. Cephalothorax with large carapace extending over the free segments; only 



two pairs of legs, first and second, with filiform, two-.iointed rami. 



Caetrodes Wilson, 1906, p. 27 



4. Carapace produced into lateral wings ; posterior body covered with a single 



dorsal plate, with large lateral lobes; third and fourth legs transformed 



into laminae Sagum Wilson, 1913, p. 28 



4. Lateral margins of carapace curled over ventrally ; dorsal plate of posterior 



body without lobes ; third and fourth legs with elongate, fleshy rami. 



Lernanthropus Blainville, 1822, p. 30 



5. All four pairs of swimming legs present and equally developed. 



EUDACTYLINAE. 6 



5. All four pairs of swimming legs present, but one or more of them modified 

 or rudimentary Psetjdocycninae. 12 



5. One or more pairs of swimming legs lacking ; those present usually modified 



or rudimentary Dichelesthiinae. 13 



6. Second antennae armed with a stout chela, cheliform 7 



6. Second antennae armed with a simple claw, uncinate 8 



6. Second antennae armed with setae only, setiferous 11 



7. Genital segment produced into a wide and flattened posterior process on 



either side of the abdomen PenicuUsa Wilson, 1917, p. 53 



7. No posterior processes, but the genital segment and abdomen much elongated 



and narrow Kr0yeria Beneden, 1853, p. 54 



8. Legs all uniramose ; claw on second antennae large but simple and not a chela. 



ErgasiUna Beneden, 1851, p. 56 



8. Legs all biramose ; claw on second antennae much smaller 9 



9. Two anterior free thorax segments short and narrow, posterior ones elongate 



and widened; exopods of swimming legs three-jointed, endopods one- 

 jointed Congericola Beneden, 1854, p. 57 



9. Free thorax segments all the same length and width ; exopods and endopods 



of swimming legs with the same number of joints 10 



10. Rami two-jointed in the female; maxilliped with simple claw. 



Nemesis Risso, 1826, p. 58 



10. Rami three-jointed in the female ; maxilliped with a large and stout chela. 



EudactyUna Beneden, 1853, p. 65 



11. Abdomen as long as rest of body ; rami of swimming legs one-jointed ; ante- 



rior thorax segments shorter and narrower than posterior ones. 



Lamproglena Nordmann, 1832, p. 71 



