142 WALTER GARSTANG, M.A. 



2. Ascidia rddis, Alder, 1863. Ann. Mag. Nat Hist. (3), ii, p. 195, 



? = Ascidia Eoulei, Garstang, 1891. 



= A. depeessa, Boule, 1884 (non Alder, 1863, nee 

 Herdman, 1881). 

 [ = var. petbicola] A. depeessa, Heller, 1875. 

 non — eudis, Heller, 1875. 



? = A. Maeioni, Boule, 1884. 



III. 



Ascidia mentula, 0. F. Miiller. 



Ascidia mentula, Miiller. Zoologia Danica, 1788, vol. i, pp. 6, 7, 

 pi. viii, figs. 1 — 4. 



— bubbotincta, Hancock. Ann. Mag. Nat. Hist., 1870. 



— eubicunda, Hancock. Ibid., 1870. 



— bobusta, Hancock. Ibid., 1870. 



Phallusia mentula, Kupffer. Jahresb. d. Komm. z. Unters. d. deutsch. 

 Meere in Kiel, Berlin, 1874, p. 209, pi. iv, fig. 1. 



Ascidia, mentula, Heller. Untersuchungen, 1875, loc. cit., pp. 2 — 13, 

 pis. i — iv. 



— eubescens, Heller. Ibid. 



— lata, Herdman. Journ. Linn. Soc, xv, 1881. 



Phallusia mentula, TrausteaZt. Die einfachen Ascidien, 1883, loc. cit., 

 pp. 457—459. 



Ascidia mentula, Boule. Becberches, 1884, loc. cit. 



Several large Ascidians, which I refer to this species, were found 

 attached to the sides of a rock, situated far out in the Zostera bed off 

 Nodes Point, on May 7th, at extreme low water, spring-tides having 

 then almost reached their height. The following descriptions refer to 

 two individuals which I brought away with me for more detailed 

 examination ; they are given separately in order to indicate the degree 

 of variation the more naturally. 



A. Body oblong, elongated, attached by almost the whole of the 

 left side. Dimensions — Length, 3 inches ; breadth, 1^ inches ; 

 thickness, ^ inch. An idea of its external appearance may be gained 

 from the figure which Heller gives (1. c. pi. v, fig. 5) to represent a 

 supposed specimen of Alder's Ascidia rudis, but the position of the 

 cloacal aperture is different. 



Test thin, hard, cartilaginous, greatly wrinkled in a longitudinal 



