424 ANNELIDA. 



When at rest they sometimes appear as a round black spot, not more 

 than half the size of the other when contracted to the utmost, though 

 when stretched out they reach its full dimensions : — they are much more 

 protean in the forms they assume. The softness alluded to is well shown 

 in Dalyell's figure 15 — the L. Neagh specimens are always of a firm con- 

 sistence. When changing the water on these Phtnarics, the individuals 

 (I shall not call them distinct species) from each locality exhibited a 

 marked diff'erence, though all appeared in equally good health, the latter 

 always retaining their hold against the sides of the phial, while the others, 

 though the liquid was poured out in the gentlest manner, became detached. 

 Specimens Avhich I have obtained on subaquatic jjlants in ditches at the 

 outskirts of Belfast were similar to those from Lough Neagh. 



P. torva, ]\Iiill. 



Several individuals just as described and figured in the work referred 

 to were obtained under stones at Church Island, Lough Beg (adjoining 

 L. Neagh), on the occasion alluded to under P. lactea. Templeton 

 notices '' P.fusca, Pallas," as Irish (Mag. Nat. Hist., vol. ix. p. 239) with- 

 out giving any particulars respecting it. This species and P. torva are 

 said by Duges to be identical (Lamarck, 2nd edit. vol. iii. p. 607). 



P. Arethusa, Dalzell. 



Found in April, 1851, on the under side of a stone at Shane's Castle 

 Park, Lough Neagh, W. T. 



TRIBE HIRUDINA. 



Genus Udonella. 



U. cnlu/ofum, Johnston. 



Numerous parasites of this species were attached to a Caligus on a grey 

 gurnard ( Trifila Gurnardus) captured on the coast of Down, on the 22nd 

 of June last, by Mr. Hyndman. 



Genus Phylline. 

 P. hij)pofflosst, Lam. 

 For some years past this species has commonly [occurred to me on 

 halibut {Hippor/lossus riiJr/an's) brought to Belfast market, and captured 

 on the coasts of Down and Antrim. 



Genus ERroBDELLA. 



U. tessulata, Miill. (sp.). 



In a letter from the Rev. Benj. J. Clarke, dated Tuam, Nov. 22, 1843, 

 it is remarked — " I have a living Nephelis tessulata with the young adher- 

 ing ; I took it in a river here last July with others of the same species, 

 and as this one contained ova, I kept it until the young were born. They 

 have not increased in size for the last two months, and have been cling- 

 ing to the unfortunate mother for three months." In a subsequent letter 

 it was mentioned that "the parent died in March (after having been kept 

 in a bottle of water for nine months), and left her numerous progeny 



