46 BRITISH TUNICATA. 



character of L. <t*j>eruni, while some of the specimens 

 have purplish or brownish undulating lines as in L. 

 maculosum. 



t 



3. Leptoclinum durum Milne Edwards. 

 (Plate LVIII, figs. 2-6.) 



Leptoclinum dnrnm MILNE EDWARDS Obs. Ascidies comp. 

 [1841], p. 82, [in Mem. Acad. tfci. lust. France, XVIII 

 (1842), p. 298,] pi. viii, f. 4; [THOMPSON in Rep. Brit, 

 Assoc. for 1843 (1844), p. 264, and in Ann. Nat. Hist. 

 (1) XIII (1644), p. 434; GRUBE Insel Lussin Meeresf. 

 (1864), p. 59 ; NOKMAN in Rep. Brit. Assoc. for 1868 

 (1869), p. 303]. 



[Amaroucium aiwum DESHAYES in Clavier's Regne Anim., 

 Moll. (dr. 1845), pi. cxxx, f. 1.] 



Leptoclinum aureum FORBES & HANLEY Brit. Moll. I [1848], 

 p. 17 ; [CocKS in Rep. R. Cornw. Polyt. Soc. for 1849 

 (1850), p. 74;] THOMPSON Nat. Hist. Ireland, IV [1856], 

 p. 362 ; [DICKIE in Rep. Brit, Assoc. for 1857 (1858), 

 p. 111]. 



Colony thin, incrusting, tough, coriaceous, of a 

 uniform buff or chamois-leather colour (PL LVIII, 

 figs. 5 and 6), sometimes inclining to flesh-colour 

 (PL LVIII, figs. 2 and 3) ; the surface containing 

 calcareous granules (PL LVIII, fig. 4), and more or 

 less distinctly furrowed by undulating lines. Common 

 excretory orifices large. Individuals rather closely set. 

 Brandt ><t I njtertiires prominent and deeply 6-cleft. 

 Abdomen nearly sessile. 



Diameter about an inch (25 mm.). 



Hal>. [? Moderately deep water. On the stem and 

 roots of Laminaria digitata from deep water (Cocks).~\ 



ENGLAND. Craster, Northumb. (Stanger). [Gwyllyn- 

 vase, Swanpool, Pennance, Bar, etc., Falmouth, Corn- 

 wall (Cocks). ~\ Douglas Bay, Isle of Man (Alder}. 



IRELAND. Strangford Lough, Down, dredged 

 (Thompson fy Hyndman). [Clew Bay, Mayo (Thomp- 

 son).'] 



First record. [Thompson, 1843.] 



