44 BRITISH TUNK'ATA. 



(i. With Calcareous c 



1. Leptoclinum maculosum Milne Edwards. 



(Plate LVIT.) 



HHK-H/.ONHHI MILNE EDWARDS Obs. Ascidies comp. 

 [1841], p. 81, [in Mem. Acad. Sci. List. France, XVIII 

 (1842), p. 297,] pi. viii, f. 2; [THOMPSON in Rep. Brit. 

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

 (1) XIII (1844), p. 434;] FORBES & HANLEY Brit. Moll. I 

 [1848], p. 16; THOMPSON Nat. Hist. Ireland, IV [1856], 

 p. 362; [WOODWARD Man. Moll. pt. 3 (1856), p. 342; 

 NORMAN in Zoologist, XVIII (I860), p. 7247; ANSTED & 

 LATHAM Channel Isl. (1862), p. 219]. 



Colony forming a thin, tough, leathery crust, some- 

 times slightly papillose, of a white or greyish colour 

 [occasionally with a blue or purplish tinge], marked 

 with undulating or branching purplish lines (PL LVII, 

 figs. 2, 5, and 7) ; the surface densely crowded with 

 stellate calcareous granules (PI. LVII, figs. 3, 4, 6, and 

 8). Individuals dispersed in a nearly quincunx order; 

 nf>d<tiiie)i> pedunculated. Common orifice rather incon- 

 spicuous. 



Diameter of mass variable, generally about an inch 

 (25 mm.) or upwards. 



Hah. On the roots of Laminaria and on other 

 marine bodies. 



On most parts of our coasts. 



ENGLAND. Northumberland coast (Alder). Isle of 

 Man (Aider). 



WALES. [Garth Ferry, Carnarvonshire (Alder).'] 

 Menai Straits, Anglesey (Alder). 



IRELAND. Belfast Bay, Antrim, and the north of 

 Ireland generally; [Clew Bay, Mayo] (Thompson). 



CHANNEL ISLANDS.- - [Parella Bay, Guernsey 

 (Norman). ~\ 



First record.- -Thompson, LS43. 



[The figures given on PL LVII probably represent 

 colour-varieties only.] 



