128 BRITISH TUXICATA. 



minutely and rather deeply plicated. The rods are 

 strong, with the papillary membrane rather contracted, 

 but having the upper border, at its junction with the 

 rod, abruptly enlarged so as to assume the appearance 

 of an obtuse tubercle. 



The greater portion of the alimentary canal is 

 covered with vesicular matter, obscuring the organ ; 

 consequently the male vesicles could not be observed. 

 The ovary (PI. XV, fig. 7), as well as the oviduct, con- 

 tained white eggs. 



This species is named after its discoverer, Mr. A. Gr. 

 More, of Dublin. Its nearest allies are Ascidia scabm 

 and A. ' 



23. Ascidia scabra Miiller. 



(PI. XV, figs. 1-7 ; PI. XVIII, fig. 7 ; PI. XIX, fig. 10 ; 



and fig. 1 in text.) 



Ascidia scabra and aspersa MULLEE Zool. Dan. Prod. [1776], 

 p. 225, no. 2726, 2728, and Zool. Danica, II [1788], p. 33, 

 pi. IXY, f. 2, 3; [THOMPSON in Ann. Nat. Hist. (1) V 

 (1840), p. 94;] FORBES and HANLEY Brit. Moll. I [1818], 

 pp. 33, 35; THOMPSON Nat, Hist. Ireland, IV [1856], 

 p. 360; [MclNTOSH Proc. B. Soc. Edinh. V (1866), p. 

 605] . 



Ascidia scabra FORBES and HANLEY Brit. Moll. I [1848], 

 p. 33, pi. C, f. 3; [NOKMAN Rep. Brit. Assoc. 1868 (1869), 

 p. 302]. 



[Ascidia scabra ? FORBES Rep. Brit. Assoc. 1850 (1851), p. 

 242. 



Ascidia aspersa CARUS in Proc. Ashmol. Soc. I (1851), p. 

 266; ? ALDER Rep. Brit, Assoc, 1866 (1867), p. 207.] 



Body suborbicular or ovate, a little compressed, 

 generally adhering largely by the side ; but rather 

 irregular in outline and area of attachment, Apeiimr^ 

 sublateral, not far apart, forming short, broad, echi- 

 nated, reddish tubes. Test tough, transparent, colour- 

 less, more or less tuberculated, especially towards the 

 apertures; sometimes nearly smooth. Mmtfl? semi- 



