LEPEOPTHEIRUS. 275 



Salmo eriox, December. Off a salmon, at a salmon- 

 leap on the river Bush, near Giant's Causeway, June 

 1837; and at Cushendale, April.* From the sea-trout, 

 Donaghadee, April ; f W. Thompson, Esq. 



2. Lepeoptheirus pectoralis. Tab. XXXII, fig. 10. 



Lern^a PECTOKALis, Midler, Zool. Dan. i, 41, t. 33, f. 7 : Eu- 



cyclop. method., Vers, t. 78, f. 12. 

 Caligus pectokalis, Kroi/er, Tidsskrift, ii, 8, t. 6, f. 4. 



— M. Edwards, Hist. Nat. Crust., iii, 454, No. 9. 



— Thompson, Ann. and Mag. Nat. Hist., xx, 247. 

 Lepeoptheirus pectoralis, Nordmann, Mikr. Beitr., ii, 30. 

 Pectoral Lern.ea, Shaw, Nat. MiscelL, viii, t. 295. 



Description. — Female. Carapace oval. Frontal plates 

 small, notched in centre. Antennse small. Thorax fully 

 as long as carapace. Penultimate joint very narrow ; last 

 joint nearly as large as carapace ; almost quadrilateral, 

 and slightly lobed at posterior extremity. Abdomen short. 

 Caudal plates small ; terminal setae short. Sternal fork, 

 with simple, sharp-pointed branches. Third pair of foot- 

 jaws large. Fourth pair of feet small. 



Hah. — Belfast Bay, W. Thompson, Esq. Off the floun- 

 der, John-dory, mackerel, dab, and sole, in March. The 

 gemmous dragonet {Callionymus lyrci), W. Yarrell, Escj. 



3. Lepeoptheirus Nordmannii. Tab. XXXIII, fig. 1. 



Caligus Nordmannii, M. Edwards, Hist. Nat. Crust., iii, 455, No. 10; 

 Atlas Regue An. de Cuv., edit. Crochart, 

 Crustac., t. 77, f. 1. 

 — Thompson, Ann. Mag. Nat. Hist., xx, 248. 



Description. — Female. Carapace rounded oval, nearly 

 as broad as long, diaphanous. Frontal plates of consi- 



* Amongst these specimens were two or three males, and in one instance 

 the male was iirmly attached to the female by his strong third pair of foot- 

 jaws. 



t Some of these specimens were of a reddish hue, aud shone with a metallic 

 lustre. 



