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,ea pectoralis, Muller -, Zool. Dan. i, 41, t. 33, f. 7 ; En- 
eyclop. method., Yers, t. 78, f. 12. 
Caligcjs pectoralis, Kroyer, 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 Lernjsa, Shaw, Nat. Miseell., viii, t. 295. 
Description. — Female. Carapace oval. Frontal plates 
small, notched in centre. Antennae 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 setse short. Sternal fork, 
with simple, sharp-pointed branches. Third pair of foot- 
jaws large. Fourth pair of feet small. 
Hab. — Belfast Bay, W. Thompson, Esq. Off* the floun- 
der, John-dory, mackerel, dab, and sole, in March. The 
gemmous dragonet ( Callionymus lyra), W. Yarrell, Esq. 
3. Lepeoptheirus Nordmannii. Tab. XXXIII, fig. 1. 
Caligus Nordmannii, M. Edwards, Hist. Nat. Crust., iii, 455,No.lO; 
Atlas Regne 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 firmly attached to the female by his strong third pair of foot- 
jaws. 
f Some of these specimens were of a reddish hue, and shone with a metallic 
lustre. 
