300 NATURAL HISTORY OP 



Hab. : Cornwail {R. Q. C), South Devon {T. E.), 

 Ilfracombe (P. H. G.), Weymouth {A. 8. P.), Shetland 

 (0. W. P.). 



" It is so like the Prince of Wales' Feather that you 

 are disposed to write ' Ich dien ' underneath." — 

 Landshorough, In colour it is light purple or lilac, 

 and forms lobed or flabellate incrustations on old bi- 

 valve shells. The cells or tubes are long- and slender, 

 and free throughout almost the entire length. The 

 walls are punctured. It is an exceedingly pretty species, 

 its distinct tubes being beautiful objects even under a 

 lens of low power. 



3. T. FIMBRIA, Lamarck. 



Tubipora serpens {Fahr., B'Orh.), T. flabellaris 

 {G. J., D. i., Bush, Aid., T. E.). 



Hab. : Wick [G. W. P.), Northumberland [Alder), 

 Shetland {G.W.P.). 



The zoarium is fan-shaped, of a dull white colour, 

 strongly wrinkled or ridged both upon the cells and in 

 the space between them. The cells are horizontal 

 throughout their entire length, and are free for a very 

 short distance only. As will be seen from the localities 

 named, this is a northern species. 



Genus III. Idmonea, Lamouroux. (From Idmon, 

 one of the Argonauts.) 

 Zoarium erect and ramose, or (rarely) adnata; 

 branches usually triangular. Zooecia tubular, disposed 

 on the front of the branches, ranging in parallel trans- 

 verse or oblique rows on each side of a mesial line. — 

 T. H. 



1. I. Atlantica, Forbes. 

 I. radians (Van Ben.). 



