286 PLTJMULARIID^E. 



With closed corbulse. 

 1. A. PLUMA, Linnaeus. 



"TiiE PODDED CORALLINE," Ellis, Corall. 13, pi. vii. figs, b, B. 



SERTULARIA PLUMA, Linn. Syst. 1309; Pall. Blench. 149 ; Esper, Pflanz. Serf.. 



t. vii. figs. 1,2; Lister, Phil. Trans. 1834, 369, pi. viii. fig. 2. 

 AGLAOPHENIA PLUMA, Lamx. Cor. flex. 170 ; Agassis, N. H. U. S. iv. 358. 

 PLUMULARIA CRISTATA, Lamk. An. s. Vert. (2nd ed.) ii. 161 ; Johnst. B. Z. 



92, pi. xxiii. figs. 1-3, and pi. xxiv. fig. 1. 

 PLUMA, Flem. Brit. An. 546. 



PKNNARIA PLUMA, Oken, Lehrb. Natur. 94. 



Plate LXIII. fig. 1. 



STEM recurved, smooth, dark brown; pinnae alternate, 

 simple, one to each internode, approximate, springing 

 from the front of the stem; HYDROTHECJE cup-shaped, 

 expanding above, aperture patulous, with a strongly 

 denticulated and somewhat everted margin ; NEMATO- 

 PHORES tubular, channelled, the lateral small and not 

 projecting much ; the anterior stout, adnate through 

 great part of its length, free at the extremity, which 

 projects but slightly ; GONOTHEC^: oviform, protected by 

 a pod-shaped receptacle, formed by the union of a num- 

 ber of crested ribs, and occupying the place of a pinna. 



Var. /3. Dichotomously branched, and of delicate habit. 



I HAVE restored the original name conferred on this well- 

 known species by Linnaeus, which has been unaccountably 

 supplanted in later English works by Lamarck's designa- 

 tion. 



The graceful plumes rise from a flexuous, creeping fibre, 

 which trails over the stems and branches of Fuci, and 

 especially of Halidrys siliquosa, large masses of which are 

 often profusely covered by this zoophyte. They sometimes 

 attain a height of 3 inches or upwards, and bear as many as 

 a dozen of the curious ribbed and crested cases (corbulce) 



