86 BEITISH TUNICATA. 



wrinkled longitudinally ; tubes short, the anal inclin- 

 ing backwards. Mantle rather delicate, yellowish, 

 tinged in parts with a reddish flesh-colour. Tenta- 

 cular filaments numerous, delicate, unequal in size. 

 Branchial sac minutely plicated, with rather long, 

 conical papillae. Oral lamina rather narrow, strongly 

 ribbed transversely, with the margin pectinated. 



Length about two and a half inches. 



Hah. Between tide-marks. 



CHANNEL ISLANDS. Guernsey (Norman). 



First record. Hancock, 1870; coll. Norman [1865]. 



FIG. 16. Ascidia rubrotincta. Natural size. 



The test of this species (fig. 16) is well supplied 

 with much-branched blood-channels ; the branches are 

 slender with the ends of the ultimate twigs much 

 enlarged, elliptical, or pyriform, appearing at the 

 surface as red points ; all the ramifications partake 

 largely of the same colour; the enlarged extremities, 

 however, and the septa dividing the tubes, are most 

 crowded with pigment-cells. 



The muscular fibres of the mantle, which are fine, 

 interwoven, and numerous, have a glossy, silky appear- 

 ance. 



The branchial sac (PI. XXVII, fig. 3) does not extend 

 far behind the visceral mass, and is minutely plicated. 

 The primary vessels are slender, with a few strong- 

 ones interspersed at irregular intervals. The secondary 



