IIG PLUSTRID^. 



An. s. Vert. ed. 2, ii. 219 : Grant, Ed. New Phil. Jouni. iii. 

 111,337: Flem. Brit. An. 535: Coxich, Corn. Faun. iii. 121, 

 pi. xsi. fig. 1 : Johnst. Brit. Zooph. ed. 2, 342, pi. Ixii. 

 figs. 1, 2: B^isk, B.M. Cat, pt. i. 47, pi. Iv. figs. 4, 5, pi. Ivi. 

 fig. 5: Smitf, Kritisk Forteckn., CEfvers. K. Vet.-Akad. 

 Forh. 18r>7, 360 and 381, pi. xx. figs. 12-16. 



Zoarium of a brown colour^, deeply divided into nume- 

 rous multifid segments^ wliich are narrowed towards 

 tlie base, and expand upwards, generally bifid at the 

 extremities, and slightly rounded. Zooecia in semi- 

 alternating rows, arched and expanded above, with two 

 spines on each side, and frequently one in the centre 

 of the upper margin ; below contracted and truncate ; 

 avicularia scattered, with semicircular mandible. Ooecia 

 extremely shallow, the opening forming an arch over 

 the upper extremity of the cell. 



Polypicle with 13 or 14 remarkably long and slender 

 tentacles. 



Height of fine specimens about 6 inches. 



Habitat. On stones, shells, &c., generally in moderate 

 depths, but also in much deeper water (62-70 fathoms) . 



Localities. Universally distributed on our coasts. 



Geographical Distribution. Belgium, exceedingly 

 common (Van. Ben.) : coast of Normandy (Jussieu) : Lissa, 

 Adriatic (Heller) : Charente-inferieure, " common at great 

 depths "" (Beltremieux) : south-west coast of France, very 

 rare (Fischer) : Society Islands (E. Forbes) : Algoa Bay, 

 a form only distinguished from the European by the 

 comparative smallness of the cells ; Amoy, China (Kirch- 

 enpauer) : Norway (Smitt) f : the Belt and Kattegat 

 (Kirchenpauer) . 



The frond-like shoots of F. foliacea rise from an in- 



* " Yellowish grey," Grant ; " of a lively flesh colour," Couch. 



t It seems not to be an Arctic species ; it has not been found, according 

 to Smitt, in Finmark or Spitzbergen. There can be no doubt that the F. 

 foliacea of Fabricius is a totallv different form. 



