CATALOGUE OF BRITISH CRUSTACEA. 
119 
1. CALIGUS. 
Caligus, Mailer, Entom. p. 128 (1785). 
Monoculus, sp. Linn. 
Binoculus, sp. O. Fabr. 
Pediculus, Baster. 
Oniscus, Slabber. 
Risculus, pt. Leach , Diet. Sc. Nat. xiv. p. 536. 
1. Caligus diaphanus. Transparent Fish-louse. 
Caligus diaphanus, Nordmann, Micr. Beitr. ii. p. 26 ; Kroger, 
Nat. Tidsk. i. p. 623, t. 6, f. 5, $ . ; M. Edw. Crust, iii. p. 452 ; 
Thump. Ann. ff Mug. Nat. Hist. xx. p. 247 ; Baird, Brit. Ent. p. 
269, t, 32, f. 1 ; Busier, Op. Subs. p. 2, t. 8, f. 9 B ? 
a—c. Old collection. (“ Caligus piscinas ”). 
d — g. Ireland (on various fish). Presented by W. Thompson, Esq. 
2. Caligus rapax. Rapacious Fish-louse. 
Caligus rapax, M. Edw. Crust, iii. p. 453, t. 38, f. 9; Baird, Bril. 
Ent. p. 270, t. 32, f. 2, 3. 
a — e. Ireland (on various fish). Presented by W. Thompson, Esq. 
3. Caligus Muelleki. Cod Fish-louse. 
Caligus Mulleri, Leach, Enc. Brit. Suppl. i. p. 405, t. 20, f. 1 — 8 ; 
Sam. Ent. U. Comp. p. 79 ; Did. Sc. Nat. xiv. p. 536 ; Desm. 
Cons. p. 342, t. 50, f. 4 ; Johnston, Edin. New Phil. Journ. x. p. 
292, t. 7, f. 12, ?. 13, $. (1824); M. Edw. Crust, iii. p. 450; 
Baird, Brit. Ent. p. 271 , t. 32, f. 4, 5. 
Risculus molvte, Leach, Did. Sc. Nat. xiv. p. 536, $ ? 
a, b. Fifeshire (on the Cod). Presented by Dr. Spalding. 
c — l. Ireland (on various fish). Presented by W. Thompson, Esq. 
4. Caligus Centrodonti. 
Caligus Centrodonti, Baird, Brit. Ent. p. 272, t. 32, f. 6, 7. 
Ireland (on Pagellus centrodonti). 
