1899.J PAUASITIC COJEPODA ON pis,hes. 473-: 



G. 6. DiOHELESTiUM Herm. 



Head obtuse. Body elongated, consistiug of four distinctly 

 arliculated segments, without dorsal plates. Genital segment oAal, 

 long. Abdomen oblong, w itli two minute caudal plates. Anterior 

 antenna3 slender, with 8 joints. Posterior antennse large, cheliform 

 at the end. The first two pairs of thoracic limbs small, tvvo- 

 braucbed, the third lamellar, the fourth suppressed, 



(1) DiCHELESTIUM SIUBIONIS, $ c? . 



Dichelestium sturionisHevm. Mem, Apterologique, 1804, p, 125, 

 pi. V. tig. 5. 

 „ „ Nordm, Mikrogr. Beitrage, 1832, p, 41. 



M,-E. Hist. Nat. Crust, iii, 1840, p, 483, 

 pi, xxxix, fig, 4, 

 „ „ H, Eatbke, Mem, Acad. Sci, St, Petersb. 



iii. 1837, p. 401. 

 „ „ V. Ben. Ann. Sc. Nat. vol. xxi. 1854, 



p. 96. 

 In Coll, Brit, Mus. 

 Host : gills of Acipenser sturio. 



G. 7. LoisrcHiDiUM Gerst, (Krbtjeria V. Ben.) 



Head broad, with two long movable styliform processes pro- 

 jecting backwards. Three distinct free thoracic segments without 

 lobes on dorsal plates. Genital segment very long, oval shape. 

 Abdomen elongated, simple, terminating in two lanceolate setose 

 caudal plates. Anterior antennae 8-jointed. Posterior antennse 

 short, cheliform ; the second maxillipeds are large and uncinate. 

 All four pairs of thoracic limbs are biramose, each branch having 

 three joints furnished with plumose setae. 



1) LOKCHIDIUM LINEATUM. $ . 



Krbyerla Uneata V. Ben. Bull. Acad. Eoy. Belg. 1853, t. xx. 

 pt. i. p. 94. 

 „ „ V. Ben. Rech. sur les Crust. Belg. 1861, p. 149, 



pi. xxii. 

 „ „ C, Claus, Beitrag Parasit. Crust, 1858, p. 24, 



pi. ii. 

 Host : gills of Galeus canis. 



(2) LONCHIDIUM ACULEATUM, $ . 



Lonchidium aculeatum Gerst. Archiv. f . Natur. 1854, p. 189. 

 Host: "Shark," Atlantic. 



G, 8, Clavella Oken, 



Head small, rounded ; thorax biarticulate, without dorsal plates 

 or lateral processes. Genital segment very long (5 or 6 times as 

 long as cephalothorax). Abdomen short. Caudal plates minute. 

 Anterior antennae 6- jointed. Posterior antennae uncinate. Second 



