POLYCLINUM SUCCINEUM. 5 



a short languet. Thorax cylindrical, occupying more 

 than one-third of the length of the body. Abdomen 

 rounded, sessile. Post-abdomen about the same length 

 as the thorax, slightly pedunculated and ending in a 

 point below. 



Diameter of the colony about three-quarters of an 

 inch (19 mm.). 



Hob. [Base of Coralline zone (50 fathoms).] 



SCOTLAND. North of Whalsey Lighthouse, Shetland 

 (Norman). 



First record. Alder, 1863; roll. Norman [1861]. 



This species was dredged by Mr. Norman on the 

 haddock-ground, about six miles north of Whalsey 

 Lighthouse. It is remarkable on account of its great 

 delicacy and the transparent funnel-shaped excretory 

 orifices which rise considerably above the surface. 



[Under the name of Polyclinum siibopacum it was 

 the intention of the authors to describe another form 

 (PI. XI, figs. 7 and 8) found by Canon Norman in 

 Gouliot Caves, Sark, in 1865. It bears, however, such 

 a general resemblance to PolycHnum succineum that it 

 may well be considered as only a variety (var. sub- 

 vpacum) of that species.] 



3. Polyclinum cerebriforme Alder. 

 (Plate LI, figs. 9-11.) 



Polyclinum cerebriforme ALDER in Ann. Nat. Hist. (3) XI 

 [1863], p. 170. " 



Colony transversely ovate, depressed, pretty-largely 

 attached, yellowish, becoming nearly black in spirit; 

 the surface corrugated into brain-like folds (PI. LI, 

 fig. 9). Individuals irregularly disposed over the 

 surface ; systems few, the excretory orifices rather 

 small, circular, with the margin very slightly produced. 



Longest diameter of mass about three-quarters of 

 an inch (19 mm.), shortest half an inch (12 mm.). 



Hab. Between tide-marks. 



