238 ANNALS OF SCOTTISH NATURAL HISTORY 



The following are the notes on two species of Marine 

 Copepods : 



DERMATOMYZON GIBBERUM, T. and A. Scott. 



1894. Dermatomyzon gibberum, T. and A. Scott, "Ann. and Mag. 

 Nat. Hist." (vi.), vol. xii. p. 144, Plate IX. Figs. 10-14. 



This species was described from a single specimen obtained in 

 a tow-net gathering collected in the vicinity of the Bass Rock, Firth 

 of Forth. Its structure seemed to indicate parasitic habits, but 

 there was nothing at the time of its discovery to show what animal 

 formed its host. In the early part of this year one of the authors, 

 while superintending some line-fishing experiments in the Firth ot 

 Forth, collected a number of specimens of the common Starfish 

 (Asterias rubens) that were brought up attached to the hooks. 

 These starfishes were subsequently washed in a bottle containing 

 methylated spirit, and the result was that nearly one hundred speci- 

 mens of Dermatomyzon gibberum were obtained, most of which, 

 however, appeared to be immature, and only a few of them carried 

 ovisacs. A short time after the capture of these specimens in the 

 Firth of Forth, several examples of this starfish obtained in Liver- 

 pool Bay were examined, and these also, on being washed in 

 methylated spirit, yielded a number of specimens of Dermatomyzon 

 gibberum; but in this case, though the specimens were not so 

 numerous as those taken in the Forth, a greater proportion of them 

 were mature and carried ova. From these and other investigations 

 made by us, we are inclined to think that this Copepod is probably- 

 parasitic on Asterias rubens, but whether it is confined to that star- 

 fish we are as yet unable to say. 



The colour of the animal is brick-red, with a few whitish streaks, 

 so that in the fresh state Dermatomyzon gibberum is not unlike the 

 young of the mollusc Pectunculus glycimeris. The colour, however, 

 soon disappears when the animal is put into methylated spirit. 



LlCHOMOLGUS HIRSUTIPES, T. Scott. 



1893. Lichomolgus hirsutipes, T. Scott, " Eleventh Annual Report of 

 the Fishery Board for Scotland," part iii. p. 286, Plate IV. Figs. 1-12. 



This is a comparatively large Copepod, being in some cases at 

 least -^Q- of an inch in length. It was first obtained among some 

 trawled material collected in the Firth of Forth at the "Rath 

 Ground," a shallow bank situated a short distance north of the Bass 

 Rock. Lichomolgus hirsutipes, like the Dermatomyzon just described, 

 appears to be more or less parasitic in its habits, but at the time of 

 its discovery we did not know of any animal with which it was 

 likely to be associated. During the same line-fishing experiments 

 that are referred to in the notes on Dcrmatomyzon gibberum, various 



