TREBITJS. 
317 
Chalimus scombri, Burm. — Carapace elongated-oval, 
somewhat narrower in front. Thorax of four distinct seg- 
ments. Abdomen large, of three joints. 
Hab. Belfast Bay : attached to Caligus Mulleri. 
Gen. 175. TEEBIUS, Kroger. 
Fourth pair of feet slender, and divided into two branches, 
adapted for swimming. Thorax possessed of three distinct 
joints. Frontal plates without sucking-discs. 
Trebitjs catjdatus, Kroyer.— Male much smaller than 
the female ; in the latter the carapace is oval, the first pair 
of foot-jaws is large and strongly toothed at the apex ; the 
abdomen is long and narrow, and ends in two small tails, 
which have one short and three long plumose bristles. In 
the male these tails are larger. 
Hab. Belfast Bay : on the skate. First found in these 
islands by the late Mr. Thompson. 
Fam. P AND ARID 
One of the prettiest of the families of the fish-parasites. 
