TRIBE II. CARYOPHYLLACEA. 419 



2. ISAURA SAVIGNII. (Audouin.} Dana. 

 I. quadrilinearis, clavata, gracilior, pallidior. 



Four lines high, clavate, more slender than the Hemprichii, and paler 

 in colour. 



Red Sea. Ehrenberg. 



Hughea Savignyi, Ehrenberg, G. x. sp. 2. planches de Savigny, 1'Egypte, Polypes, 

 Palythoa Savignii, Audouin, Explic. des tab. 2, fig. 1. 



3. ISAURA ASTER. (Dana.) 



I. potticaris, 2-3'" crassa, extus cinerascens disco, semipollicari, brun- 

 neo, radiis numerosis, pallide luteo-virescentibus ; tentaculis biseriatis, 

 olivaceis. 



An inch high, and 2 to 3 lines thick, with the exterior ash-coloured, 

 disk half an inch in diameter, brown, with numerous pale greenish- 

 yellow rays; tentacles in two series, olive green. 



Plate 30, fig. 2, zoophytes, natural size ; 2 a, same, enlarged. 



Feejee Islands. Exp. Exp. 



The tentacles which fringe the broad disk are about a sixth of its 

 diameter in length : those of the outer series have a pale greenish-gray 

 colour ; immediately around the mouth the disk is green. 



4. ISAURA SPECIOSA. (Dana.) 



I. robusta, f " alta et 2-4'" lata, pallida, disco 8'" lato, viridi, props mar- 

 ginem brunnescente ; tentaculis brevibus, triseriatis, serie externd luted, 

 intermedia umbrino-virescente, internd viridi. 



Stout, | of an inch high, and 2 to 4 lines thick, pale; disk 8 lines 

 broad, deep-green, but becoming brown near the margin ; tentacles 



