of the Fishery Board for Scotland. 



173 



most part the anterior portion of the head of a bright red or orange 

 colour, and frequently the male was found adhering tc the female. 



Tope (or topers) are occasionally brought to the Aberdeen Fish Market 

 by the steam trawlers, and it is from the fishes landed there that 

 I have obtained most of my specimens of this parasite. Mr. Duthie 

 has recently, however, sent me specimens of the parasite obtained 

 on male topers captured in the seaward portion of the Clyde and landed 

 at that port. The discovery of this species by Mr. Duthie makes an 

 interesting addition to the Clyde Copepod-fauna. 



One of the more obvious characters by which the species may be dis- 

 tinguished is that of the comparatively large roundish disks which termi- 

 nate the short second pair of maxillipedes. The whole animal is short and 

 robust — very different iu appearance from the more elegant Lernceopoda 

 galei. 



One of the most typical female specimens obtained by us gave the 

 following measurements : — From forehead to end of thorax, 5*5mm. ; 

 from forehead to end of posterior thoracic appendages, 7mm. ; from fore- 

 head to end of ovisacs, 13mm. ; greatest width of thorax, almost 4mm. 



The male of Lernceopoda bidiscalis has a general resemblance to that of 

 Lernceopoda galei, but the maxillipedes and other mouth-organs, and the 

 antennal appendages, differ somewhat in structure from those of that 

 species. 



Lernceopoda salmonea (Gisler), (PL VIII., fig. 26.) 



1751. Pediculus salmonis, Gisler, K. S. Vet. Ak. Handl., vol. xii., 



p. 171, PI. VIII., figs. 1-5. 

 1761. Lernceopoda salmonea, Linn. , Faun. Suec. (2nd edition), 



p. 509, No. 2102. 

 1850. Lernceopoda salmonea, Baird, op. cit., p. 335, PI. XXXV., 



fig. 6. 



This species was obtained on the gills of a diseased salmon, Salmo salar, 

 caught in the Firth of Tay in January 1891, and also on the gills of a 

 trout sent to the Fishery Board's laboratory from a loch in Sutherland- 

 shire. Lernceopoda salmonea is a smaller species than any of the others 

 already mentioned ; the specimen represented by the figure measured only 

 about 6mm. 



In this species the arms are short and moderately stout. The cephalo- 

 thorax seen from above is sub-triangular, while the posterior portion of 

 the thorax assumes a sub-clavate form by gradually increasing in width 

 towards the distal extremity. The posterior thoracic processes and the 

 abdomen are very minute (fig. 26). 



Lemoeopoda cluthce, sp. n. (PI. VIII., figs. 27-37.) 



The cephalothorax in this species is small and sub-triangular. A distinct 

 and comparatively narrow neck connects the cephalothorax with the 

 posterior portion of the body ; this posterior portion is somewhat dilated 

 and sub-cylindrical, and, in spirit specimens, shows a few pseudo-constric- 

 tions. Two short processes spring from the posterior end of the genital 

 segment, and the abdomen, which is situated between these processes, is 

 very small. The thoracic arms (second maxillipedes) are slender and of 

 moderate length. 



The antennules and antennae are somewhat similar to those of species 

 already recorded (figs. 30, 31). The mandibles are small, and their 

 biting margins are finely and somewhat irregularly serrated, and in this 

 respect they differ very markedly from the same appendages in Lernozo- 



