436 Mr. W. Thompson's Additions to the Fauna of Ireland. 



Mr. Ball remarks that when alive it is of a beautiful green colour, 

 and generally adheres to the cornea of the fish's eye : one of those 

 sent to me is fixed to the body of the sprat close to the dorsal fin. 



Nymphum gracile. Leach, Zool. Misc. vol. i. p. 45. pi. 19, f. 1. 

 Shores of Antrim and Down, W. T. 



Orythia coccinea, Johnst., Mag. Zool. and Bot. vol. i. p. 378. pi. 13. 

 Portaferry, Strangford lough, 1837 : Mr. Hyndman and W. T. 

 See Edw. Hist. Crus. vol. iii. p. 536. 



Pychnogonum littorale, Strom, (sp.), Edw. Hist. Crust, vol. iii. 

 p. 537. 



Pychnogonum balcEnarnm, Fabr. This common species was inci- 

 dentally omitted in former ** Additions to the Fauna of Ireland." 

 Pyc. balcenarum must on our coast be content with a smaller victim 

 than a whale, and condescends to suck the juices of an Actinia. 

 In January 1834, several of these parasites, from a very minute 

 to a middle size, were found upon the Actinia mesemhryanthemum 

 at Bangor* by Mr. Hyndman and myself: on the shore near 

 Dublin, the Pychnogonum has likewise been taken on Actinia by 

 Dr. Bellingham. Specimens from Ballantrae, Ayrshire, and 

 Whitehaven, Cumberland, are in my collection : among oysters 

 brought from the latter place to Belfast, I have found them par- 

 ticularly numerous. 



CiRRHIPEDA. 



Anatifa dentata. Lam. A specimen of this Anatifa from Magilligan, 

 county Londonderry, is in Mr. Hyndman's collection. It pre- 

 sents every character of A. laevis, Lam., except in the dorsal valve 

 being slightly dentate — a character insufficient in my opinion to 

 constitute a specific difference. 



Pollicipes cornucopicB, Leach; Lepas pollicipes, Gmel. Mr. Warren 

 of Dublin informs me that he once saw fresh specimens brought 

 to Mr. Glennon's shop, and which were stated by the person in 

 whose possession they were to have been found in the taking 

 down of a lock for repairs at Ringsend, Dublin. 



Balanus scoticus, Brown's lUus. pi. 7. f. 22. This species or variety 

 is found on Pecten maximus in the north, and on the Dublin coast 

 by Dr. Farran, who remarks that he has obtained it only on this 

 shell. 



Balanus punctatus, Mont. Found at Carrickfergus ; common on the 

 island of Ireland's Eye, Dublin coast (W. T.), and at Youghal 

 (R. Ball). 



Balanus candidus, Leach, Brown's lUus. pi. 6. f. S-lOf. Specimens 

 of this fine Balanus taken off the northern coast of Dublin, or be- 

 tween Carlingford and the Isle of Man, are in the collections of 

 Mr. Warren, Dr. Farran, and Mr. R. Ball of Dublin. The largest 

 specimen is three inches in height (not reckoning valves) and 

 nearly as much in diameter. The species varies greatly in form, 



* The Bangor noted throughout this paper is on the coast of Down, 

 f See correction of L. scoticus and L. candidus in description of plate 

 32. 



