266 Proceedings of the Loyal Irish Academy. 
the case mentioned by Smith, Captain Hutton found some two or three 
specimens in a gathering made by him at Malahide, Co. Dublin, as 
mentioned in the Proceedings of the Dublin Microscopical Club, 15th 
December, 1864; Q. J. M.S., April, 1865, p. 167. Had these forms 
been found in the proximity of a harbour resorted to by foreign vessels, 
it might be suspected they were imported from foreign seas, and 
deposited as the vessels unladed their freight; but such a supposi- 
tion cannot be entertained regarding Malahide. I was present at the 
meeting when the specimens were exhibited, and remember that 
Captain Hutton informed me that he had not been working with any 
material likely to contain these forms, and that he was confident they 
were taken from the sea at Malahide, as the vessels used in the pre- 
paration were new, and had not been used before. I have myself to 
add, that a single frustule was recently found by me in a gathering 
made by Rev. M. H. Close, at a place called Drehidnamaud, on the 
coast of the Co. Kerry. 
In the same gathering which yielded the specimens of Arachnoi- 
discus Ehrenbergiui, Captain Hutton found some specimens of what he 
regarded as Arachnoidiscus ornatus; but considering it likely these 
latter were not specifically distinct, I only refer here to the cireum- 
stance as corroborative of the probability that Arachnoidiseus Ehren- 
bergii was found at Malahide. 
Genus VIII. Cnrasprpopiscus, Ehr. 
Disk not undulate, having a broad border, with areolation differing 
from that of centre. 
Craspedodiscus coscinodiscus, (Ehr.) Marine. 
Border broad, about the third of the entire diameter, areolate 
areoles hexagonal. Middle portion punctate. (Pl. 26, fig. 26.) 
Ralfs, in Pritch., p. 832, Pl. v., fig. 80.—Craspedodiscus pyxidicula, 
Brightwell, Q. J. M. 8., 1860, p. 95, Pl. v., fig. 4. 
Stomachs of Ascidians, Broadhaven Bay, Co. Galway. 
Genus IX. Actinoprycuus, Ehr. 
Disk undulate, divided into strongly defined somewhat triangular 
compartments, with a distinct polygonal centre, the sides of the 
polygon being equal to the number of compartments into which the 
disk is divided. 
The valves in this genus appear to consist of two distinct plates, 
with a striation somewhat different, hence the species have by some 
being unnecessarily multiplied. 
