OF NORTHTTMBERLAND AND DURHAM. 109 



Under stones at low-water mark, rare. St. Mary's Island. — 

 A.H. 



Order. — (Les Ascidies composees, Milne Edwards,) 

 Family. Botryllid^, McLeay. 



127. APLIDIUM, Savigny. 



1. A. Ficus, Linn. % 



Aplidium ficus, Forb. and Hani. Brit. Moll. i. 11 1 

 Under stones among tlie rocks at Cullercoats, rare. — A. II. 

 The specimen we refer, with doubt, to this species, formed an 

 irregular lobed mass of a brownish colour, with the animals 

 thickly disposed through it, without apparent pattern. Longest 

 diameter nearly two inches. 



2. A. FALL AX, Johns. 



Aplidium fcdlax, Johns, in Loud. Mag. Nat. Hist. vii. 15, 

 f. 4 ; Forb. and Hani. Brit. Moll. i. 11. 

 On sea-weeds, in pools between tide-marks, at Cullercoats, 

 rare. — J. A. 



128. SIDNYUM, Savigny. 



1. S. TURBINATUM, Sav. .? 



Sydneum turhinatum, Flem. Brit. Anim. 469? 

 A species, which we had always taken to be this, is not rare on 

 our coast, but it differs from that figured in Forbes and Hanley's 

 "British Mollusca." It is inversely conical, sometimes adhering 

 by a narrow base, and is of an orange-red colour, with the animals 

 vertically and concentrically arranged : their branchial apertures 

 are eight-cleft. The masses are of different sizes, from a quar- 

 ter to half an inch high, erect, and frequently clustered. 



129. POLYCLINUM, Satigny. 

 1. P. AURANTIUM, 31. Edw. 1 



Polyclinum aurantiuni, Forb. and Hani, Brit. Moll. 14, t. A, 

 f. 3. 

 On the under side of stones between tide-marks at Cullercoats 

 rather rare. — A. H 



