»5 

 5> 



1899.] PAEASmC COPEPODA OS PISHES, 473 



G. 6. DiCHELESTiuM Herm. 



Head obtuse. Body elongated, consistiug of four distinctly 

 articulated segments, without dorsal plates. Genital segment oval, 

 long. Abdomen oblong, with two minute caudal plates. Anterior 

 antennae slender, with 8 joints. Posterior antennas large, cheliform 

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

 branched, the third lamellar, the fourth suppressed. 



(1) DiCHELESTIUM SITJEIOiaS. $ d • 



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



pi. V. fig. 5. 

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

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

 pi. xxxix. fig. 4. 

 „ „ H. Eathke, Mem. Acad. Sci. iSt. Petersb. 



iii. 1837, p. 401. 

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



p. 96. 

 In Coll. Brit. Mus. 

 Host : gills of Acipeiiser stuno. 



G. 7. LoifCHiDruM Gerst. (Krbyeria V. Ben.) 



Head broad, with two long movable stylifonn 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 antennae 

 short, cheliform ; the second maxillipeds are lai'ge and uncinate. 

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

 three joints furnished with plumose setae. 



1) LONCHIDIUM LINEATTJM. $ . 



Kroyeria lineata V. Ben. Bull. Acad. Roy. Belg. 1853, t. xx. 

 pt. i. p. 94. 

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



pi. xxii. 

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



pi. ii. 

 Host : gills of Galeus canis. 



(2) LoNCHiDiina ACULEATuir. 9 • 



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

 Host: "Shark." Atlantic. 



G. 8. Clatella 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 



