26 BRITISH TUNICATA. 



p. 208; NORMAN in Rep. Brit. Assoc, for 1868 (1869), p. 



302]. 

 Ascidia opalina MACGILLIVRAY Moll. Aiiim. Aberdeen [1843], 



p. 312. 

 Ascidia virginea FORBES & HANLEY Brit. Moll. I [1848], 



p. 33, pi. C, f . 2 ; ALDER & HANCOCK in Trans. Tyneside 



Nat, Field Club, I [1848], p. 200; [COCKS in Rep. R. 



Cornw. Polyt. Soc. 1849 (1850), p. 73 ; RUPERT JONES in 



Cyclop. Anat. IV, pt. 40 (1850), p. 1201 ; CARUS in Proc. 



Aslimol. Soc. II (1851), p. 266; LANDSBOROUGH Treas. 



Deep (1847), p. 34, and Excurs. Arran (1852), p. 34;] GOSSE 



Tenby (1856), p. 63; [THOMPSON Nat. Hist. Ireland, IV 



(1856), p. 360 ;] NORMAN in Zoologist, XV [1857] , p. 5708 ; 



[MERRIFIELD Nat. Hist. Brighton (1860), p. 81 ; MURRAY 



in Proc. R. Soc. Edinb. IV (1860), p. 271; ANSTED & 



LATHAM Channel Isl. (1862), p. 219]. 

 [Phnllusia virginea MURRAY in Proc. R. Soc. Edinb. IV 



(1859), p. 149.] 



Non Ascidia virginea 0. F. MULLER (1776). 

 \_Corella parallelogramma HANCOCK in Ann. Nat. Hist. (4) 



VI (1870), p. 362,] 



Body ovate or subquadrate, compressed, adhering 

 by its base. Apertures, branchial very little promi- 

 nent, scarcely tubular, atrial situated a little to one 

 side on a longish tube surpassing the branchial in 

 height ; both with red ocelli. Test firm, hyaline, and 

 perfectly transparent, showing the bright-coloured 

 mantle through. Mantle thin, transparent, attached 

 only at the tubes, more or less marked with crimson 

 and opaque yellow. A circular belt of yellow is seen 

 near the top of the branchial sac, and opaque yellow 

 lines and spots (sometimes star-like) intermixed with 

 crimson blotches, are dispersed over the sides. The 

 dark intestine is seen proceeding from a fawn-coloured 

 stomach on the left side, making a turn downwards at 

 the base of the sac, and rising towards the anal 

 aperture, accompanied by the white oviduct. On the 

 right side there are a few strong radiating muscles 

 near the margin of the mantle ; they are absent on 

 the left, and the meshes of the branchial sac are also 

 seen more distinctly through. Tentacular filaments 



