72 BRITISH TUNICATA. 



(1856), p. 703; McANDREW & BARKETT in Ann. Nat. Hist. 

 (2) XVII (1856), p. 385;] THOMPSON Nat. Hist. Ireland, 

 IV [1856], p. 362; [DICKIE in Eep. Brit. Assoc. for 

 1857 (1858), p. Ill; H. & A. ADAMS Gen. Recent 

 Moll. II (1858), p. 597, pi. cxxxiv, ff. 1, lo; FORBES & 

 GODWIN-AUSTEN Nat. Hist. Euro]). Seas (1859), p. 158; 

 MERKIFTELD Nat. Hist. Brighton (I860), p. 81; NORMAN 

 in Zoologist, XVIII (1860), p. 7247; BRONN Thier-Reichs, 

 III (1861), pp. 114, 115, 117, 164, pi. xii, if. 13-15]. 



Colon)/ (fig. 120) inc rusting, thin, transparent, pale 

 brownish-grey, with the marginal tubes purplish in 

 colour. Individuals (fig. 1 28) forming circular or oval 



FIG. 126. Botryllus polycychis. Xat.ural size. (Savigny, pi. iv, f. 5.) 



systems of from four to twelve each [8 to 20, Forbes 

 and Hanley] (PL LXIII, fig. 2, and fig. 127 in text), 

 of a brownish or purplish hue, occasioned by spots or 

 blotches of claret-colour and blue on a brownish 

 ground ; usually one or two blotches of opaque white 

 in the centre of the thorax upon a dark-blue ground, 

 and a circle of white spots around the disc. General 

 excretory orifice* rather small, the edges thickly 

 sprinkled with white and blue. 



Diameter of general mass one to two inches (25 

 50 mm.). Length of individuals [about a line (2 mm.)]. 



Hob. On the underside of stones and on Fuci 

 between tide-marks, and in the Laminar ian zone. 

 [Chiefly on the fronds of Laminaria digitata (Thomp- 



