6 NOTES ON ENTOMOSTRACA FOUND AT 



Harpacticus chelifer, O. F. Miiller (Plate 2, figs 9-16). 



I figure here some of the appendages of young specimens 

 of H. chelifer found among roots of Laminaria. The young 

 of this species grown under such conditions is generally 

 extremely melanotic : this I have noticed in specimens taken 

 at Holy Island and Gare-loch, as well as in those taken 

 among fuci in tide-pools at North Sunderland, and I believe 

 that the same tendency may at times be seen in the young of 

 other species. The dark coloration disappears gradually with 

 the growth of the individual, and is usually entirely lost — 

 giving place to the normal pale brown or straw-colour — 

 before the full growth is attained. I give in Plate II. examples 

 of these conditions as seen in a very early and in a rather 

 later stage of development. 



Genus PONTOPOLITES, T. Scott. 



Pontopolites typicus, T. Scott (Plate I., figs. 4-12). 



Pontopolites typicus, Scott, Additions to the Fauna of the 

 Firth of Forth (Twelfth Annual Report of the Fishery 

 Board for Scotland), p. 251, Plate VIII., figs. 9-17. 



This interesting species was described and figured by Mr. 

 Scott from specimens taken off Musselburgh. But in some 

 minor characters, chiefly connected with the setiferous 

 armature of the limbs, my specimens appear to differ from 

 the types : I therefore give drawings of some of the more 

 important parts. I have not been able, with the most careful 

 examination, to detect on the limbs any plumose hairs such 

 as are represented in Mr. Scott's figures nor any ciliation at 

 their joints : the sets of the secondary branch of the posterior 

 antennee are considerably longer than those of the Scotch 

 specimens. Mr. Scott describes and figures the fourth pair 

 of feet as having a rudimentary inner branch similar to those 

 of the second and third pairs : the Holy Island specimens, 

 however, do not show this, but have no internal branch, 

 unless the very minute spine indicated in fig. 10 be taken to 

 represent one. 



