liOTRYLLOIDES ALBICANS. 81 



in Abh. schles. Ges. vaterl. Cultur, 1868-69 

 (1869), p. 125; ANSTED & LATHAM Channel Isl. (1862), 

 p. 219]. 



[Botryllus albicant* DESHAYES in Cuvier's Regne Anim., 

 Moll. (dr. 1845), pi. xxviii, f. 3; THOMPSON in Ann. Nat. 

 Hist. (1) XVIII (1846), p. 385.] 



Colony (PL LXIV, figs. 5 and 7) mcrusting, trans- 

 parent, white with a slight tinge of purple or flesh- 

 colour ; marginal tubes white. Individuals moderately 

 large, transparent white Avith an opaque white circle 

 around the branchial aperture, and the under part of 

 the thorax also opaque white ; arranged in more or 

 less elongated series, sometimes assuming a subcircular 

 form approaching to that of Botryllus (PL LXIV, 

 fig. 6). 



Diameter of general mass rather small, seldom 

 exceeding half an inch (12 mm.). 



Halt. On stones and Fuci. [On the underside of 

 stones between tide-marks, and on Fucus vesiculosus, 

 etc., in rock-pools (Thompson). On the under surface of 

 stones and on stems of the yoimg Fucus serratus (Cocks). ^ 



ENGLAND. Bamborough, Northumb. (Alder). St. 

 Mary's Island, Northumb. (Hancock). [Falmouth, 

 Cornwall (Cocks). ~\ 



IRENAND. Springvale, Down (Thompson). 



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



First record. [Thompson, 1846.] 



4. Botrylloides vinosa sp. noc. 



Colony incrusting and rather sinuous in outline, 

 thin, transparent, of a pale purplish tinge with white 

 marginal tubes. Individuals purplish-brown or claret- 

 coloured, sprinkled with a darker shade of the same 

 colour, and with a bifid white spot behind the bran- 

 chial aperture ; arranged in short systems with single 

 or double rows on each side, not much undulating and 

 sometimes nearly elliptical ; the undulating margin of 

 the common cloacal orifice edged with white. 



in. 6 



