o/ the Fishery Board for Scotland. 295 



The fifth pair consist of broad lamelliform and uniarticulate plates 

 situated on the lateral aspect and near the distal end of the fifth body 

 segment ; each foot is about one and a half times longer than broad, it is 

 evenly rounded at the apex, and furnished with two or three small seta3 

 (fig. 24). 



The caudal furca, which are fully one and a half times the length of the 

 last abdominal segment, are somewhat dilated, and provided with a small 

 seta on the outer edge and two small tooth-like spines on the rounded 

 apex (fig. 25). 



Habitat. — On the gills of an Augei-Ush, R/mia squatina (hin.), cai>ti\red 

 about 8 to 9 miles S.E. from Buchan Ness in January last (1902). My 

 son finds this parasite to be moderately frequent on the gills of Angel- 

 fishes captured in the Irish Sea. 



This being the first Eudadyline described, may be considered the type 

 of the genus, and its description given above will show more clearly the 

 distinctive points by which the next species may be satisfactorily 

 identified. 



Eudactylina similit;, T. Scott, sp. nov. PI. XII., figs. 1-19. 



Description of the Female. — Length of the female specimen represented 

 by the figure, 2*97 mm. (about j2_ of an inch) ; it resembles in general 

 appearance the Eudadijlina acuta (Van Beneden), but diflfers in the pro- 

 portional lengths of the body segments and in the structure of some of 

 the thoracic and tail appendages. The first body segment (fig. 1) is about 

 one and a half times the length of the second • the second, third, and 

 fourth are nearly equal in length, but the second is rather the longest ; 

 the last is equal to about two-thirds of the length of the preceding 

 segment. The abdomen is small, being scarcely equal to a third of the 

 entire length of the thorax. 



The antennules are stout, and taper towards the distal extremity ; they 

 somewhat resemble, in structure and armature, the antennules of 

 Eudactylina acuta (fig. 3). 



The antenna? (fig. 4) are moderately stout and four-jointed, the first 

 and second joints are each furnished with a short and stout tooth-like 

 spine on its inner aspect; the last joint is short and is armed with two or 

 three stout but short terminal claws. 



The mandibles are very feeble, and are similar to those of Eudactylina 

 acuta (fig. 5). 



The maxilla? are small and of a simjile bilobcd structure, the principal 

 lobe is rather longer than broad, and bears two moderately long spini- 

 form terminal setii?, the one being about twice the length of the other ; 

 the secondary lobe is small and provided with a slender one-jointed 

 branch which extends somewhat beyond the apex of the primary lobe, 

 and terminates in a moderately long spiniform seta, as shown by the 

 drawing (fig. 6). 



The first maxillipeds are also small, they are three-jointed and armed 

 with a minute terminal claw (fig. 7). 



The second maxillipeds are moderately large and strongly chelate, the 

 terminal joint is broad and its lateral angles are more or less produced ; 

 the one angle is extended into a spoon-like process, while to the other is 

 articulated a stout, strongly-curved claw, the apex of which impinges 

 against the spoon-like process of the opposite angle as shown in the 

 drawing (fig. 8). 



The first pair of thoracic feet are somewhat similar to those of 

 Ewlactylina acuta except in the following particulars: — The inner margin 



