26Q Proceedings of the Boyal Irish Academy. 



the case mentioned by Smith, Captain Hutton found some t-^o or three 

 specimens in a gathering made by him at ^alahide, Co. Dublin, as 

 mentioned in the Proceedings of the Dublin Microscopical Club, loth 

 December, 1864 ; Q. J. M. fe., 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 "vrere imported from foreign seas, and. 

 deposited as the vessels unladed their freight ; but such a supposi- 

 tion cannot be entertained regarding 3klalahide. 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 foims, 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 fnistide was recently found by me in a gathering- 

 made by Eev. M. H. Close, at a place called Drehidnamaud, on the 

 coast of the Co. Eeny. 



In the same gathering which yielded the specimens of Arachnoi- 

 discus Ehrenbergii, Captain Hutton found some specimens of what he 

 regarded as Arachnoidiscus ornatus ; but consideiing it likely these 

 latter were not specifically distinct, I only refer here to the circum- 

 stance as corroborative of the probability that Arachnoidiscus Ehren- 

 bergii was foimd at Malahide. 



Genus YIII. Ceaspedodiscts, Ehr. 



Disk not undulate, having a broad border, with areolation differing- 

 from that of centre. 



Craspedodisciis cosci?iodiSCUS, (Ehr.) ilaiine. 



Border broad, about the third of the entire diameter, areolate 

 areoles hexagonal. Middle portion punctate. (PI. 26, fig. 26.) 



Ealfs, inPritch.,p. 832, PI. v., fig. 80. — Craspedodiscus pyxidicula^ 

 BrightweU, Q. J. M. S., 1860, p. 95, PL v., fig. 4. 



Stomachs of Ascidians, Broadhaven Bay, Co. Galway. 



Genus IX. AcTi>-0PTTCHrs, 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. 



