^54 Mr. Thompson's Additions to the Fauna of Ireland. 



Alcyonidium hirsutum, Johnst. B. Z. 303. pi. 42. f. 1, 2. 



Alcyonium hirsutum, Flem. Not uncommon on the northern 

 shores. W. T. 



Alcyonidium echinatum, Johnst. B. Z. 304. pi. 42. f. 3, 4. 



Alcyonium echinatum, Flem. Commonly encrusting univalve shells 

 •around the coast. 



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

 tached to SertularicE, &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. 

 1837. 



Spongia mammillaris, 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. 



Halichondria parasitica, Flem. 



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

 uncommon on marine plants and the larger coralHnes 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 1835 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, Elhs, 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 181 8. 



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*. 



* Flahellaria opuntia, Blain. Actin. p. 551. tab. 96. f. 4. Halimeda 

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



