354 Mr. W.Thompson’s Additions to the Fauna of Ireland. 
with any described species. They were submitted to Professor Bell 
for the use of his work on the British Crustacea, and proved to be 
of a species that he considered new, and of which he had just drawn 
up a description under the name of H. pandaliformis. ‘ This name” 
(he observed) ‘‘ suggested itself from their leading to the typical 
Palemons through Pandalus ;” a peculiarity of structure which had 
also attracted my attention. 
2. Idotea acuminatum, Leach ? 
Among Crustacea kindly sent from Dublin for my inspection by 
R. Ball, Esq. were two individuals of an Jdotea 10 lines in length, 
very distinct in form from our three common species, the J. pelagica, 
I. entomon and J. estrum of Leach. They were purchased of Mr. 
M‘Calla, but on what part of the coast taken was not stated. I mark 
the species with doubt on account of Leach’s only specimen in the 
British Museum, with which they were compared, being in a bad 
state of preservation. The J. acuminatum was first noticed in the 
British Museum catalogue of Crustacea, p. 95 (published in 1847), 
as among Dr. Leach’s inedited species. He obtained it on the coast 
of Devon, and called it in his MS., Leptosoma lancifer. 
8. Caligus Nordmanni, Edw. Hist. Crust. vol. iii. p. 455; and 
Atlas, Cuv. Rég. Anim. pl. 77. f. 1. 
I took several specimens of this fine Caligus alive on a sun-fish 
(Orthagoriscus mola) captured on the coast of Antrim in September 
1848. They were all adherent externally to the skin of the fish on 
different parts of the body. When living they were marbled over 
with grayish lilac of dark and light shades. This species was erro- — 
neously included in a paper published in the 20th vol. of the ‘ An- 
nals,’ p. 248. The name C. Mulleri being substituted there for C. 
Nordmanni will make all correct. Two others noticed in the same 
page require the following correction, according to Dr. Baird, who 
then kindly assisted in determining them, but has since given the 
subject a more rigid examination. 
Caligus vespa should be Cal. Stromit, a species since described by 
Dr. Baird in the Report of the Berwickshire Naturalists’ Club for 
1847, p. 259%, 
Caligus sturionis should be Cal. rapar, Edw. Hist. Crust. vol. iii. 
p. 453. pl. 38. f. 9. 
ANNELIDA. 
1.. Planaria flezilis, Dalyell, @bserv. on Planarie, p. 5. f.1, 2. 
April 14, 1848. I found at Cultra, Belfast bay, two Planarie of 
this species adherent to the under side of a stone between tide-marks, 
and brought them home in sea-water to be observed at leisure. When 
fully extended they are 6 lines long, and at the head 23 broad, be- 
coming thence gradually narrower. Eyes commencing at ‘the distance 
of a line from the anterior extremity of the body ; all extremely mi- 
nute, but differing in size ; disposed irregularly in a somewhat cres- 
centic form on either side a transparent circle. The vessels along 
* [See also Annals, vol. i. Ser. 2. p. 396.] 
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