474 ME. p. w. BASSETT-SMirn ON [A.pr- 18, 



maxillipeds very sleuder. Only two pairs of thoracic limbs, both 

 biraniose and biarticulate. 



(1) Clavella uippoglossi. 5 , 



Clavella hijjporjlossi Kr. Tidsskrift, i. 1.837, p. 196, pi. ii. fig. 3. 

 „ „' Guerin, Icon, du Eegne Aniin. 1829-43, 



pi. X. fig. 7. 

 „ „ M.-E. Hist. Nat. Crust, iii. 1840, p. 494. 



„ „ V. Ben. Ann. Sc. Nat. 3 ser. vol. xvi. 1851, 



p. 100, pi. iii. figs. 5, 6. 

 In Coll. Brit. Mus. 

 Host : Hii)j}or)lossus vulgaris. 



(2) Clavella mulli. $ . 



Clavella mulli V. Ben. Ann. Sc. Nat. 3 ser. vol. xvi. 1851, p. 101, 

 pi. iii. fig. 4. 

 „ „ B.-S. Journ. M. B. Assn. Plymouth, 1896, p. 159. 



Host : gills of Mullus sp. 



(3) Clavella tenuis. 2 . 



Clavella tenuis Heller, Reise d. Novara, 1865, p. 215, pi. xxiii. 



fig.l- 



Host : gills of Monocentris sp. Philippines. 



a. 9. Cybicola B.-S. (Helleria B.-S.) 



Head rounded. Thorax with three distinct segments bearing 

 lateral lobes but no dorsal plates. Q-enital segment very long. 

 AbdomeD small, with two lanciforin appendages. Anterior antennae 

 6-ioiated. Posterior anteunae 3-joiiited, strongly hooked at the 

 end. Second maxilliped vei-y large, basal joint robust. Three 

 pairs of thoracic limbs, all rudimentary, the first biramose, the 

 second uniraiiiose, the third stump-like. 



" Male " smaller. Posterior antennae strongly prehensile"; no 

 thoracic lateral lobes. 



(1) Cybicola aemata. S 2 • 



Helleria armata B.-S. Ann. & Mag. N. H. ser. 7, vol. i. 1898, 



p. 10, pi. v. tigs. 1, 2. 

 Cijbicola „ B.-S. op. cit. ii. 1898, p. 371. 

 lu Coll. Brit. Mus. 

 Host : Cijbium spp. Indian seas. 



G. 10. PSBUDOCLAVELLA B.-S. 



Head small, rounded. A single free thoracic segment without 

 lobes or dorsal plates. Genital segment oval, 4 times as long as 

 cephalothorax. Abdomen very short. Caudal plates minute, 

 setiferous. Anterior antennae indistinctly 3-jointed. Posterior 

 antennae short, uncinate. Second maxillipeds slender. Four pairs 

 of rudimentary limbs present, the first two biramose, third and 

 fourth from the genital segment stump-like. 



