BOTRYLLUS GEMMBUS. 69 



Diameter of general mass about an inch (25 mm.). 

 Length of individuals one third of a line (0*7 mm.). 



Hob. On stones at low water-mark and adhering 

 to Fuci. [Attached to steins and fronds of Fucus 

 serratus, etc. (Cocks}.] 



ENGLAND. [Selley's, Oliver's, and Glasson's beaches, 

 Falmouth, Cornwall (Cocks).] Ballaugh, Isle of Man, 

 on stones (Forbes). 



IRELAND. Belfast Bay, Antrim, on Fuci, dredged 

 by Edmund Getty, [and Clew Bay, Mayo] (Thomp- 

 son) . 



First record. [Thompson, 1843.] 



6. Botryllus violaceus Milne Edwards. 

 (Plate LXII, figs. 3-5.) 



f! riolacens MILNE EDWARDS Obs. Ascidies coinp. 

 [1841], p. 89, [in Mem. Acad. Sci. List. France, XVIII 

 (1842), p. 305,] pi. vi, ff. 4, 4 a, and pi. vii, ff. 3-3 6; 

 [DESHAYES in Cuvier's Regne Anirn., Moll. (dr. 1845), pi. 

 xxviii, f. 2 ; LOWIG & KOLLIKER in Ann. Sci. Nat. (3), 

 Zool. V (1846), p. 217, pi. vi, f. 28; and in Arch. Sci. 

 Nat. Ill (1846), pp. 210, 297 ;] FORBES & HANLEY Brit. 

 Moll. I [1848], p. 22; [THOMPSON in Ann. Nat. Hist. 

 (2) I (1848), p. 64; COCKS in Eep. R. Cornw. Polyt. Soc. 

 f.r 184'. (1850), p. 74; RUPERT JONES in Todd's Cyclop. 

 Anat. IV, pt. 40 (1850), p. 1191, f. 771, and p. 1196, f. 

 7746; EYTON in Ann. Nat. Hist. (2) X (1852), p. 436;] 

 THOMPSON [in Rep. Brit. Assoc. for 1852 (1853), p. 293, 

 and] Nat. Hist. Ireland, IV [1856], p. 363 ; [WOODWARD 

 Man. Moll. pt. 3 (1856), p. 341, pi. xxiv, f. 8; OWEN Moll. 

 in Eucycl.Brit. ed. 8, XV (1858), p. 332 ; BRONN Thier- 

 Reichs", III (1861), pp. 115, 187, pi. xiv, f. 18; ANSTED 

 & LATHAM Channel Isl. (1862), p. 219]. 



Colony (PL LXII, figs. 3 and 5) a thickish, semi- 

 transparent, olive-coloured crust, with white or blue 

 imbedded gemmae. Individuals forming circular or 

 elliptical systems of from five to twelve or more 

 (PL LXII, fig. 4), of a deep indigo-blue colour, 

 sometimes bordering upon violet, rather paler around 



