1899.] PARASITIC COPEPODA ON FISHES. 465 



in size from first to fourth ; termiBal joints of all with short hook- 

 like setae. External ovaries long, thread-like, twisted, concealed. 



(1) Ceckops latreillii. $ c? . 



Cecrops ZafmZZu Leach, Ency. Brit. Supp. i. 1816, pi. xx. figs. 1-5. 



„ „ Lamarck, Anim. s. Yert. ed. i. t. 138, 1818. 



„ „ Latreille, Encycl. meth. pi. 335, fig. 3-9. 



„ „ Desmarest, Cons, sur les Crust. 1825, 338, pi. 1. 



fig. 2. 



„ „ Guerin. Icon. Ecgne An., Crust. 1817, pi. xxxv. 



fig. 8. 



„ „ M.-E. Hist. Nat. Crust, iii. 1840, p. 474. 



„ „ Baird, Brit. Entom. 1850, p. 293, pl.xxxiv. fig. 1. 



„ „ Nordm. Mikrog. Beitrage, 1832, p. 39. 



„ „ Kroyer, Bid rag til Kundskab, 1863, p. 190. 



„ „ V. Beued. Eech. sur la faun. lit. Belg. 1861, 



p. 149, pi. XX. 



„ „ Thomson, Trans. N. Z. Inst. vol. xxii. 1889. 



In Coll. Brit. Mus. 

 Host : Orthagoriscus mola. Mediterranean. 



Gr. 21. Phtllophoeus M.-E. 



Carapace cordiform. Anterior antennae projecting, triarticulate. 

 Kostrum long. Thorax with three broad, spreading, overlapping 

 plates. Genital segment rounded. Abdomen with short lateral 

 blunt processes on either side of its base. All the limbs biramose 

 and lamellar, without bristles or hooks. 



(1) Phyllophorus cornutus. $ . 



PhyJlopIiorus cornutus M.-E. Hist. Nat. Crust, iii. 1840, p. 471, 

 pi. xxxviii. fig. 13. 



Host : — ? Tongatabu. 



G. 22. Gangliopus Gerst. 



Carapace broader in front than behind, not deeply notched in 

 the centre. Anterior antennae free, biarticulate ; first maxilhpeds 

 unciform. Three free thoracic segments with large dorsal plates, the 

 first with the inner margins widely separated, those of the 2nd 

 and 3rd with the inner borders approximated. All four pairs of 

 thoracic limbs biramose, the first having the outer branch with one, 

 inner with two joints, those of the second and third both two- 

 jointed, the fourth single-jointed. 



(1) Gangliopus pteieormis. $ c? . 



Gangliopv^ pyriformis Gerst. Arch, fiir Naturg. xx. 1854, 

 p. 192, pi. i. fig. 9. 



Nogagus curticaudatus c? , Dana ? vide Stp. & Liitk., Bidrag til 

 Kund. 1861, p. 390. 



Host : — ■? Atlantic. 



