80 BRITISH TUNICATA. 



Colony (PI. LXIV, fig. 4) pale reddish-brown in 

 colour, with red marginal tubes. Individuals bright 

 opaque-red, approaching to orange around the bran- 

 chial aperture and cloacal line ; set in shortish 

 compact systems a little sinuatecl. Tentacular fila- 

 ments orange. 



Diameter of mass about an inch. 



Hal). On stones and Fuci between tide-marks. [On 

 the under surface of stones and on stems of the young 

 Fucus serratus (CorJis).~\ 



ENGLAND. Falmouth, Cornwall (Alder [and Cocks']). 

 Fowey, Cornwall (Peaclt}. 



IRELAND. Belfast Bay, Antrim (Tliompson). 

 CHANNEL ISLANDS. [Guernsey (Ansted fy Latham). ,] 

 First record. Forbes & Hanley, 1848; [coll. Alder]. 



[Milne Edwards says 'that Botrylloides rubrum is 

 remarkable for its brilliant colour, and may be dis- 

 tinguished from B. rotifer (p. 83) by the tunic of the 

 individuals (petites Ascidies) being opaque and of 

 a very intense red-lead colour; also by the confines 

 of the various systems united into one mass being 

 much more distinct, by the clear demarcation between 

 the individuals in the same system and the much-raised 

 nipple-like form of the anterior extremity of their 

 body, and by the fairly well-developed tentacular 

 filaments.] 



3. Botrylloides albicans Milne Edwards. 

 (Plate LXIV, figs. 5-7.) 



Botrylloides albicans MILNE EDWARDS Obs. Ascidies comp. 

 [f841], p. 88, [in Mem. Acad. Sci. lust. France, 

 XVIII (1842), p. 304,] pi. vi, f. 2; FORBES & HANLEY 

 Brit. Moll. I [1848], p. 24, pi. A, f . 8 ; [ALDER & HAN- 

 COCK in Trans. Tyneside Nat. Field Club, I (1848), p. 

 207 ; COCKS in Rep. R. Coriiw. Polyt. Soc. for 1849 (1850), 

 p. 74; EYTON in Ann. Nat, Hist. (2) X (1852), p. 436; 

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

 MCANDREW & BARRETT in Ann. Nat. Hist. (2) XVII (1856), 

 p. 385;] THOMPSON Nat, Hist, Ireland, IV [1856], p. 363; 



