104 BRITISH TUNICATA. 



opaque, rather soft and contractile, strongly wrinkled, 

 especially longitudinally, more or less mamillated, and 

 much corrugated in contraction ; generally covered 

 with zoophytes and other extraneous matters; inside 

 smooth and shining. Mcmtle (PI. XXXIV, fig. 3; 

 PI. XXXV, fig. 1) adhering closely to the test, opaque 

 yellowish white, streaked with red towards the aper- 

 tures. Tentacular filaments linear, lono-, and tapering. 

 Branchial sac (PL XXXIV, fig. 4; PI. XXXVI, figs. 1 

 and 2) with four strong folds on each side ; oral lamina 

 smooth, narrow. Ovaries (PI. XXXVI, figs. 2-7, and 

 figs. 60 and 61 in text) thickly covering the internal 

 surface of the mantle in rounded or ovate masses of a 

 purplish or reddish hue, interspersed with soft pyri- 

 form papillae. 



Lenf/tJi two to two and a half inches; breadth one 

 half less. 



Halt. On stones and shells in deepish water. 



ENGLAND. - - Not uncommon on the coasts of 

 Northumberland and Durham (Alder}. [Cullercoats, 

 Northumb. (Alder $ Hancock, 1848).] 



SCOTLAND. Aberdeen (Macgillivmy) . 



CHANNEL ISLANDS. Guernsey (Ald^r). 



First record. [Macgillivray, 1843.] 



fttyela tiiberosa is a very coarse species, often much 

 overgrown with zoophytes, and its form obscured by 

 numerous swellings caused by Modioli imbedded in 

 the test. 



2. Styela informis (Forbes). 



(PL XXXIV, fig. 6 ; PL XXXVI, figs. 8 and 9 ; and 



fig. 62 in text.) 



Cynthia informis FORBES in Brit. Moll. I [1848], p. 38; 

 [? ALDER in Rep. Brit, Assoc. for 1866 (1867), p. 208]. 



"Bod a rudely conical, subtuberous ; test (PL XXXIV, 

 fig. 6) thick, coriaceous, crimson [or orange-coloured], 



