KOTBYLLOIDES LEACHII. 79 



Diameter of mass from one to tliree inches (25-70 

 mm.) or upwards. [Length of individuals one-fourth, 

 of a line (0'5 mm ).] 



Hal). On the underside of stones and amongst 

 rocks between tide-marks, and occasionally investing 

 the roots of Laminaria digitata, etc. 



ENGLAND. Cullereoats and Whitley, Northumb. 

 (Alder}. [Falmouth, Cornwall (Codes) J\ Douglas, 

 Isle of Man (Aider). 



SCOTLAND. [Firth of Clyde (Norman).'] Orkney 

 Islands (Heddle). 



IRELAND. North-east coast (Thompson). 



First record.- -Thompson, 1840. 



[Savigny says that the systems are very numerous, 

 much crowded, usually composed of six to twelve 

 individuals, and sometimes of twenty-five to thirty ; 

 and that the branchial aperture is white, encircled by 

 a fawn-coloured collar ringed with white. He named 

 the species after Dr. "William Leach by whom he says 

 it was communicated to him. It was removed by 

 Milne Edwards from Botri/llus to his new genus 

 Botrylloides, together with Botri/llus rosaceus (fig. 114, 

 p. 52). 



A single individual of a variety of the colour of B. 

 rubrmn is figured (PI. LXIV, fig. 3).] 



2. Botrylloides rubrum Milne Edwards. 

 (Plate LXIV, fig. 4, and PI. LXVI, fig. 5.) 



Botrylloides rubrum MILNE EDWARDS Obs. Ascidies comp. 

 [1841], p. 87, [in Mem. Acacl. Sci. List. France, XVIII 

 (1842), p. 303,] pi. vi, f. 3, and pi. vii, f. 2; FORBES & 

 HANLEY Brit, Moll. I [1848], p. 24; [COCKS in Rep. E. 

 Cornw. Polyt. Soc. for 1849 (1850), p. 75;] THOMPSON 

 [in Rep. Brit. Assoc. for 1852 (1853), p. 293, and] Nat. 

 Hist. Ireland, IV [1856], p. 363; [ANSTED & LATHAM 

 Channel Isl. (1862), p. 219] . **"j 



[Botrylloides rubra GOSSE Man. Marine Zool. II (1856), 

 pp. 34, 50.] 



