CALIGUS. 271 



of feet long and slender ; the last joint terminating in a 

 long curved claw, serrated on its inner edge, and two or 

 three short spines at its base. Oviferous tubes nearly 

 the length of the body. 



Male. In the male, the last joint of the thorax is 

 considerably smaller, and more of an ovoid shape, than 

 in the female; while the abdomen is longer, narrower, 

 and divided into two articulations, the first being the 

 shorter. The terminating setae are long, and densely 

 plumose. 



Third pair of foot-jaws large. In other respects much 

 the same as female, but rather smaller. 



This species strongly resembles the C. minimus of 

 Otto ; but there is no notch on frontal plates ; the sides 

 of the carapace are not hairy, and the antennae are diffe- 

 rent, being much larger. 



Hah. Belfast Bay, W. Thompson, Esq. Taken from 

 the gurnard (Trigla kirundo etpini), November 1839 ; the 

 Zeusfaber, in February; Trigla gurnardus, June; Platessa 

 limanda, December ; Lough Neagh trout, March ; Corre- 

 gonus pollan, Lough Neagh, November and December ; 

 the brett, Rhombus vulgaris, March, November, and De- 

 cember ; Merlangus vulgaris, March and December. 



2. CALIGUS MULLEBI. Tab. XXXII, figs. 4, 5. 



CALIGUS MULLEKI, Leach, Enc. Brit. Supp., \, t. 20, f. 1-8. 



Desmarest, Coiis. gen. Crust., t. 50, f. 4;a-e. 



Description. Female. Carapace oval, rather longer 

 than broad, narrower at upper extremity. Frontal plates 

 of considerable size, notched in the centre. Lunules well 

 developed. Antennae of considerable size; basal joint 

 large. Thorax shorter than the carapace, about half the 

 size ; penultimate joint very small, of an elongate 

 diamond shape ; last joint nearly quadrilateral, and lobed 

 at posterior extremity. On each lobe there are two very 

 small tubercles, each of which gives off two short setae. 



