1899.] PARASITIC COfEPODA OlST FISHES. 475 



(1) PSEUDOCLAVELLA OTALIS. 5 . 



Pseudoclavella ovalis B.-S. Ann. & Mag. N. H. ser. 7, vol. ii. 

 189S, p. 95, pi. vi. fig. 1. 

 In Coll. Brit. Mus. 

 Host : gills of Serranus sp. Muscat. 



Gr. 11. PsEUDOCYCNtrs Heller. 



Head oval. Thorax with three segments, bearing small lateral 

 lobes. Genital segment long (3 times that of cephalothorax). 

 Abdomen short, broad. Caudal appendages very small, simple. 

 Anterior antennae 3-jointed. Posterior antennae small, uncinate. 

 Second maxillipeds as moderately strong biarticulate hooks. Pive 

 pairs of rudimentary limbs ; the first and third uniramose, the 

 second biramose ; fourth and fifth minute, stump-like; the last 

 rising from the posterior extremity of the genital segment. 



(1) PSEUDOCTCNUS APPENDICULATUS. $ . 



Pseudocycnus appendiculatus Heller, Reise d. Novara, 1865, 



p. 218, pi. xxii. fig. 7. 

 „ „ B.-H. Ann. &, Mag. N. H. ser. 7, 



vol. ii. 1898, p. 368. 

 Hosts : gills of GorypJioena and Thynnits macropterus. Aden, 



G-. 12. CrONUS M.-E. (Gongericola V. Ben.) 



Head rounded. Two distinct free thoracic segments withodt lobes 

 or caudal plates- Genital segment oval. Abdomen short. Caudal 

 plates small, setiferous. Anterior antennae 6 jointed. Posterior 

 antennae 2-jointed, uncinate ; second maxilliped slender. Pour 

 pairs of rudimentary thoracic limbs, all biramose. 



(1 ) Cyonus gracilis. 2 • 



Cycnus gracilis M.-E. Hist. Nat. Crust, iii. 1840, p. 496, pi. xli. 

 fig.l. 

 „ „ Heller, Reise d. Novara, 1865, p. 216, pi. xxii. 

 fig. 6. 



Host : Gadus ? Adriatic. 



(2) Ctonus pallidus. $ cj . 



Gongericola pallida V. Ben. Bull. Acad. Roy. Belg. t. xxi. pt. 2, 

 1854, p. 583. 

 ,, „ V. Ben. Mem. Acad. Roy. Belg. xxxiii. 1861. 



p. 148, pi. xxiii. 

 Cycnus pallida B.-S. Journ. M. B. Assn. 1896, p. 159, 

 In Coll. Brit. Mus. 

 Host : gills of Ganger vulgaris. European seas. 



