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 Planarice, the individuals 
(I shall not call them distinct species) from each locality exhibited a 
marked difference, 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 which I have obtained on subaquatic plants in ditches at the 
outskirts of Belfast were similar to those from Lough Neagh. 
P. torva, Mull. 
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. fused, 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. caligorum, Johnston. 
Numerous parasites of this species were attached to a Caligus on a grey 
gurnard ( Trigla Gurnardus ) captured on the coast of Down, on the 22nd 
of June last, by Mr. Hyndman. 
Genus Phylline. 
P. hippoglossi, Lam. 
For some years past this species has commonly [occurred to me on 
halibut ( Hippoglossus vulgaris ) brought to Belfast market, and captured 
on the coasts of Down and Antrim. 
Genus Ekpobdella. 
E. tessulata, Mull. (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 
