132 BRITISH TUNICATA. 



[Var. echinata rar. not'.'] (PL XV, figs. 5-7.) 



Strongly echiiiated, mucli depressed, and adhering 

 for its whole length ; the sides of the test spreading in 

 a flat disc. 



Lenr/th half an inch. 



SCOTLAND. - - Lamlash Bay, Arran (Stevenson & 

 Carpenter). 



[Var. laevis car. nov.~\ 



Orbicular, adhering largely by the side. Test 

 smooth or wrinkled, with the apertures very large and 

 stroii 2'ly echiiiated. 



a / 



Length three quarters of an inch. 

 CHANNEL ISLANDS. Guernsey (Al<:l'r). 



24. Ascidia Normani Alder and Hancock. 



(PL IV, figs. 3 and 4; PL XVIII, fig. 8; PL XIX, 

 fig. 11; PL XX, fig. 9.) 



[Ascidia Normani ALDEE and HANCOCK in Ann. Nat. Hist. 

 (4) VI (1870), p. 361.] 



Body elongated, pretty-regularly oval, white, deli- 

 cately tinged with rosy flesh-colour, attached by the 

 side of the base, transparent, strongly echiiiated, par- 

 ticularly towards the base and apertures, where the 

 spines are usually compound. Apertures of a rose- 

 colour, wide, produced, strongly ribbed and echiiiated 

 longitudinally; the branchial being terminal, the anal 

 about a third down the ventral margin ; ocelli small, 

 inconspicuous. Test thin, transparent, white, or only 

 slightly tinged with pale flesh-colour, covered with 

 simple and compound spines, strongest towards the 

 apertures and base. Ma it tie delicate, of a pale buff 

 flesh-colour, or almost colourless, the tubes well pro- 

 duced, and of a rosy colour. Tentacular filaments 

 rather long, white, wide at the base, distant, alternately 

 large and small, not very numerous. Branchial sac 

 minutely plicated ; stomata long ; thickened margin of 



