Mr. Thompson on the Mollusca of Ireland. 95 



are not so regularly disposed over the body as represented in 

 Chiaie's work ; they are most developed about the orifices. 



* Cynthia claudicans, Sav. Mem. p. 150. pi. 2. fig. 1. 



Not uncommon on oysters and other shell-fish taken in the 

 north-east of Ireland. Savigny describes it as common on 

 the oysters brought to Paris. 



Phallusia intestinalis, Sav. Mem. p. 169. pi. 11. fig. 1. 



Obtained in Strangford lough. 



Clavelina lejmdiformis, Sav. p. 110, 174. 



Ascidia lepadiformis, Mull. Z. D. vol. ii. p. 119. tab. 79- f. 5. 



As last. 



*Distoma rubrum, Sav. Mem. p. 177- pi. 3. fig. 1. and pi. 13. 



On Laminaria digitata, dredged in Belfast Bay, by Edm. 

 Getty, Esq., and kindly sent me. This species was communi- 

 cated by Leach to Savigny, who notices it simply as inhabiting 

 the European seas. My specimens were not of so lively a 

 colour as represented in Savigny 5 s work. 



Distoma variolosum, Gaert. Sav. Mem. p. 38 and 178.? 



A Distoma apparently from description (I have not seen 

 any figure) of this species has occurred to me investing Fucus 

 serratus in Belfast Bay; the colour was always whitish- 

 yellow. Gaertner announced the D. variolosum to be found 

 enveloping Fucus palmatus, on the coast of England. 



Botryllus Leachii, Sav. Mem. p. 199. pi. 4. f. 6. and pi. 20. 

 f. 4. Delle Chiaie, vol. iii. p. 94. tav. 36. f. 14 — 16. 



North-east of Ireland, occasionally investing the roots of 

 Laminaria digitata, &c. ; when dried it has somewhat the 

 appearance of a sponge. This species was sent by Leach to 

 Savigny, who marks it with doubt as from the English coast. 

 On the shores of Naples it has been found by Delle Chiaie 

 as above cited. 



Botryllus Schlosseri. Phil. Trans, vol. 49. p. 449. pi. 14. 



I have occasionally obtained this on Algae, in the loughs of 

 Strangford and Belfast, and have found it attached to stones 

 at the island of Lambay, Dublin coast. 



*Botryllus polycyclus, Sav. Mem. p. 47. pi. 4. fig. 5. Bo- 

 tryllus Renieri. Delle Chiaie, vol. iii. p. 93. 



