POLYPI. 77 



tinctly inserted into an indent of the stem. The last form the 

 genus Laomedea LAMOUROUX. Those which have cells entirely 

 without pedicle may be thus divided : 



a) with cells bifarious or scattered (Sertularia LAM.) 



Sp. Sertularia abietina L., ELL. Corall. PI. I. No. i. B, b j Sertularia pumila 

 L., ELL. Corall. PI. v. No. 8. fig. a, A, LISTER, Phil. Trans. 1834. PI. vm. 

 fig. 3, &c. JOHNSTON, Br. Zooph. p. 66, PI. xi. figs. 3, 4, and p. 75, PI. 



XIII. fig. I. 



b) with cells verticillate (Antennularia LAM.) 

 Sp. Sertularia antennina L., ELL. Corall. PI. IX a. 



c) with cells secund (Plumularia LAM.) 



Sp. Sertularia pluma ELL. Corall. PL vn. fig. b, B, &c. JOHNSTON, Br. 

 Zooph. p. 92, PI. xxin. figs, i 3. 1 



ORDER II. Octactmia. 



Tentacles eight, pinnate. Nutrient canal contained in a distinct 

 abdominal cavity, connected with it by interposed lamellse. 



Family III. Xenina. Common body, fleshy or membraneous, 

 affixed by the base. Polyps not retractile, with pinnate tentacles. 



Xenia SAV. Common body growing upwards into stems divided 

 at the top, branches short. Polyps fasciculate, collected at the 

 extremities of the branches into globose heads, or umbels. 



Sp. Xenia umbellata SAVIGNY, Description de VEgypte, Polypes, Tab. i. fig. 

 3 ; SCHWEIGGER'S Beobaclitungen auf nalurhist. Reisen. Tab. v. fig. 48 ; in 

 the Red Sea. 



Anthelia SAV. Common body, membraneous, plane, spread over 

 marine bodies, stoloniferous. Polyps standing out, erect, crowded, 

 at the surface of the membrane. 



Sp. Anthelia glauca SAVIGNY, Descr. de l'Eyypte } Polypes, Tab. I. fig. 7. 



Note. Genus Rhizoxenia EHRENR is founded on a figure of 

 Zoantha thalassantha of LESSON in the zoological plates of Du- 

 PERRY'S voyage (Voyage autour du Monde sur la Corvette la 

 Coquille, pendant les annees 1822 1825). The common body is 



1 Many species which have been referred to Sertularia, belong to the Bryozoa. 

 Amongst them are those which LAMARCK has brought together under the genus Serio- 

 laria. See VAN DEB HOEVEN'S Handb. der Dierkunde, first edition, i. p. 76. 



