440 PROF. W. A. HEBDMAN" ON BRITISH TUNICATA. 



to the eye even on the right side ; the branchial sipliou is of 

 extreme length. The prebranchial zone is papillated ( Pi. XXXV. 

 fig. 7). The tentacles are very numerous and closely placed. 

 They are alternately large and small, and there are about 60 of 

 each. The dorsal tubercle is large and of ovate form, the aperture 

 is anterior, and the horns are irregular, and may even fork (see 

 figs. 4, 5). 



The renal vesicles are exceedingly abundant, and are filled 

 with yellow and brown concretions (PI. XXXV. fig. 2). They 

 are scattered over the wall of the stomach, and intestine, and even 

 encroach upon the mantle, 



I do not think that the specimens from Marseilles referred to 

 A. producta by Eoule * belong to this species. As one distinction, 

 the dorsal tubercle is of an entirely diff'erent type in Eoule's 

 species, 



10. A. elongata, A. & H. — I have seen no specimens of this 

 species, I would suggest^but I am judging from Hancock's 

 short description alone — that the single specimen from Seaham 

 Harbour might be an elongated example of Ascidiella aspersa 

 (0. E. MiiUer). 



11. A. affinis, A. & H, — I have examined Canon Norman's type 

 specimens, obtained by Dr. Baird in the Eiver Eoach, Essex, 

 in 1865, and I am of opinion that they are very like overgrown 

 flabby individuals of Ascidiella virginea (O. E. M.). I have seen 

 large specimens of what Alder and Hancock called "A. sordida'^ 

 (which is A. virginea) from the Eirth of Eorth which were like 

 the present form. Pedunculated individuals also, sucb as some 

 of these affinis, are found in A. virginea f. On the other hand, 

 the tentacles and dorsal tubercle in Canon Norman's specimens 

 remind me more of A. aspersa; but these are very variable 

 organs. 



12. A. Normani, A. & H. — I have seen what is left of the 

 type specimen, collected by Canon Norman between tide-marks in 

 Strangford Lough in 1869 ; but unfortunately the specimen had 

 evidently at some former time dried up, and nothing can now be 

 made out from it except the shape and a thin membranous, 

 almost leathery, test. 



* Ann. Mus. Marseilles, t. ii. Mem. 1. 



t I described one as variety 'pedunculata in Traus, Koy. Soc. Edinb. vol. xxxii. 

 part i. p. 98. 



