130 NATURAL HISTORY OF 



being again branclied, so as to give the shoot a plumose 

 appearance. 



Calycles cup-shaped with serrated margins, three 

 teeth on each side, two much everted. Mesial sarco- 

 theca freer than in A. jjluma, and quite prominent. 

 Lateral sarcothecse prominent and tubular. Gono- 

 phores borne in corbulse with spur-like processes, as 

 in A. tubiiUfera. 



The zoophyte springs from a creeping stolon. A 

 large number (from 15 — 20) of stems arise from a 

 single stolon. 



Genus IV. Lytocarpus, Kirchenpauer. 



Stem doubly or simply pinnate. Calycles with ser- 

 rated or undulated margin, and with the mesial nema- 

 tophore opening externally by one or two orifices. 

 Gonophores protected by detached, over-arching pro- 

 cesses, which never form corbulae. — Allman. 



There is only one British species of this genus, the 

 distinguishing characteristic of which is the protective 

 case for the gonophores, which consist of " cylindrical 

 or spine-Hke appendages, which over-arch, but are 

 never united so as to form a closed chamber.^' 



1. L. MYRIOPHYLLUM, Linn. 



Sertularia myriophyllum (Linn., Pall., Esper., E. and 

 8., Berk., Stew., Bosc), Plumularia myriophyllum 

 (Temp., G. J., D. L., B. Q. C, P. H. a., McA., De B.), 

 Pennaria myriophyllum (Oken), Aglaophenia myrio- 

 phyllum [Lamx., Ag., T. H.). 



Hab. : Rare. Lamlash Bay {D. L.), Torbay {T. H.), 

 Dartmouth (Busk), Aberdeen {Macgillivray) , Dublin 

 (Ellis), Isle of Man (Forbes). Height 6—12 in. 



" This very rare coralline grows to the height of 1 



4 



