254 Mr. Thompson's Additions to the Fauna of Ireland. 



s 



ileyonidium hirsuium, Johnst. B. Z. 303. pi. 42. f. 1, 2. 



Alcyomum hirsutttm, Hem. Not uncommon on the northern 

 shores. W. T. 



Alcyonidiwn echinatutn, Johnst. B. Z. 304. pi. 42. f. 3, 4. 



Aleyomum echinatum, Flem. Commonly encrusting univalve shells 

 ; i round the coast. 



Alcyonidiwn ? parasiticum, Johnst. B. Z. 304. pi. 41. f. 4, 5. At- 

 tached to Sertularia, &c. on the northern and eastern shores. 

 W. T. 



Plumatella repens, Lam. Johnst. B. Z. 322. f. 51. In rejectamenta 

 on the shores of Lough Earn, I obtained this species in Sept. 

 1S37. 



Spongia mammdlaris, Zool. Dan. vol. iv. p. 44. tab. 158. f. 3, 4. A 

 specimen of this sponge, which I have not seen referred to as 

 identical with any British species, was dredged in Strangford 

 lough in 1835, by Mr. Hyndman and myself. 



Halichondriu parasitica, Flem. 



Spongia parasitica, Mont. Wern. Mem. vol. ii. p. 114. Not 

 uncommon on marine plants and the larger corallines on the 

 north-east coast. W. T. 



Halichondria suberica, Flem. Coldstream, Edin. New Phil. Jour. 

 1830. vol. ii. p. 235. pi. 4. 



Spongia suberica, Mont. This species, as represented by Dr. Cold- 

 stream, has occurred to me investing univalve shells dredged in 

 the loughs of Strangford and Belfast. In the former locality I 

 in 1 835 obtained the Spongia ? suberia, which in the Magazine 

 of Natural History, vol. vii. p. 491, is described and figured by 

 Dr. Johnston, who considered it the "perfect state of the 

 H. suberica." 



Halichondria ventilabra, Flem. Sea-fan sponge, Ellis, Phil. Trans. 



1765, p. 289. tab. 11. f. H. 

 Spongia ventilabra, Linn. Specimens of this sponge (with one of 

 which I have been favoured,) were obtained by Mr. R. Ball 

 from the Nymph Bank in 1818. 



Grantia ciliata, Flem. 



Spongia ciliata, Fabr. Sp. coronata, Ellis and Soland. Zoop.p. 190. 

 tab. 58. f. 8 and 9. This very beautiful species I have com- 

 monly found on marine plants on the north-east coast, and 

 occasionally of large size*. 



* Flabellaria opuntia, Blain. Actin. p. 551. tab. 96. f. 4. Halhneda 

 opuntia, Flem. Brit. Anim. p. 515. A specimen of this Flabellaria in 



