124 NATURAL HISTORY OP 



on tlie stem closer, and the branchlets more numerous, 

 straighter, and longer. Amongst the microscopic 

 characters the most noticeable is that the internodes 

 of the branchlets are equal in length, and all Ijear 

 calycles. 



Genus II. 'Pujkxjla'ria, LamarcTc {in part). 



Zoophyte consisting of plumous shoots, simple or 

 branched, jointed, attached by a creeping stolon. 

 Hydrothecce cup-shaped. Nematopliores movable, dis- 

 tributed along the stem and branches. Gonothecce 

 always unenclosed, differing in the two sexes. — T. H. 



1. P. PiNNATA, Linn. 



Sertularia pinnata (Linn., E. and S., Berk., Tiirt., 

 Stew., Bosc), Aglaophenia pinnata {Lamx.). 



Hab. : Generally distributed. Height 1 — 7 in. 



This is the " Jointed Sea-bristle Coralline " of E. 

 and S. It is described by Dr. Johnston as " very deli- 

 cate, white or rarely horn colour, simple, plumous, and 

 pretty." 



Dr. Landsborough describes the surprise of the Arran 

 boatmen, who were astonished at his caring for the 

 dredged zoophyte in its collapsed state, on his plunging 

 it into clear water and showing it to them in all its 

 beauty. " They did not think there had been anything 

 so bonny in the whole bay." The calycles, which 

 appear like a plain glass tumbler, are inserted in the 

 pinnfe, one to each internode. The nematophores, 

 which are cup-shaped, are attached to each internode, 

 one being placed just below the insertion of the 

 calycle. 



2. P. SETACEA, Ellis. Plate IX. fig. 4. 



Corallina setacea {Ellis), Sertularia pinnata, var. /3. 



