the Fishery Board for Scotland. 



153 



in the first pair of feet, and in the outer branch of the second foot in the 

 male, but it may be distinguished from it by its nine-jointed antennae 

 (H. Jiexus only having eight joints), and in the form of the lower foot 

 jaw, H. Jiexus is also much more sparingly covered with spines. It was 

 pretty abundant about the end of September. 



^au8 spinatus (Goodsir). — Body broadly oval j the lateral angles of the 

 various segments produced posteriorly ; margins of the first body segment 

 beset w^ith a few short setae. Anterior antennae nine-jointed and setife- 

 rous; posterior antennae two-jointed, the first bearing a small two-jointed 

 inner branch. In the female the outer branch of the fifth pair of feet, 

 elongated, bearing five terminal setae ; inner branch short and broad, 

 densely ciliated; in the male, the inner segment is wanting. Caudal 

 segments short and broad, inner tail setae about as long as the animal, 

 tt was found in March of this year, but not in any great numbers. 



Peltidmm depressum (Baird). — In the shape of its body it is very like 

 P. interruptum, only of a larger size ; the anterior antennae also are 

 similar. The fifth pair of feet are alike in both sexes ; they have no 

 spines on their sides, but have three at their apices, and at the apex of 

 the first joint on the inner margin there is a long seta, and about the 

 middle of the second joint, on the outer side, another but shorter one 

 projects. The caudal segments bear five setae, three of which are plumose, 

 and one, the outer, strong and spinous. It is an easily identified species, 

 as the large first segment and the abdomen are more or less translucent, 

 allowing the antennae and feet to be well seen, the second and third segments 

 are, however, highly coloured with a crimson or purplish tint. Specimens 

 of this species are sometimes found devoid of pigment altogether, and I 

 found one of P. interruptum also in that condition. It was not common, 

 although more plentiful than the preceding form. 



Peltidium interr upturn (Goodsir). — The body is elongated and depressed, 

 the margin of each segment being clearly marked. Abdomen not distinct 

 from cephalothorax, caudal segments and setae short. Anterior antennae 

 nine-jointed; in the male knotted and clawed at the apex. Fifth pair 

 of feet shaped somewhat like a seal's flipper, and strongly spinous, but 

 with one slender marginal seta near the middle. In the female the 

 anterior antennae are much more slender than those of the male, although 

 their second joints are somewhat swollen. The general colour is brown, 

 but the margins of the body segments are red, or yellow, or they may 

 be purple. This copepod was not common, the surface net only bringing 

 up a few once or twice. 



What appears to be a variety of this species was also met with. The 

 foot of the fifth pair had only four setae, two of which were apical, and 

 two on the outer margins. The caudal segments bore only three setae 

 each, and the first abdominal segment had on its outer angles a strong 

 spine, similar to the spine in the same position of P. Crenidatum. 



Porcellidium fimhriaturii (Glaus).— It is tolerably easily recognised by 

 the broad ovate appearence of its body, the fifth pair of feet forming two 

 broad plates, with ciliated margins lying alongside of the two caudal 

 segments; and of the caudal segments themselves which are broadened 

 and ciliated very much in the same manner as the fifth pair of feet. It was 

 common on Laminaria during October of last year. 



Idya furcata (Baird). — Body elongated, gradually tapering from the 

 cephalothorax towards the tail. Anterior antennae eight-jointed, the fourth 

 joint bearing a long curved olfactory organ. In the male, the median 

 joints are much swollen and united. Posterior antennae three-jointed, 

 bearing several terminal setae, five of which are hinged in the middle ; 

 the inner branch is long and four-jointed. The swimming feet are well 



