SUBORDER ALCYONARIA. 629 



bable that the polyps, on examination, will prove one or both of these supposed varieties 

 to be distinct from the rugosa. 



The genus CLAVULARIA, of Quoy and Gaymard, is thus characterized by them : 

 " Animaux cylindriques a huit tentacules pinnes contenus dans des tubes claviformes, 

 coriaces, stries, subpedicules, fixes et agglomeres." 



Clavularia viridis. " C. tubis coriaceis, clavulatis, rectis aut subcontortis, longitrorsum 

 striatis, virescentibus ; polypis striatis, fuscis, tentaculis planiusculis, pinnatis, violaceis." 

 Length about two inches; exterior of the tubes containing subcalcareous spicules. Island 

 of Vanikoro, incrusting dead'corals. (Voy. del'Ast., iv. 260, pi. 21, figs. 10-12 ; Blain- 

 ville, Man. d'Act., 500.) 



Clavularia violacea. " C. minima, tubis cylindricis, coriaceis, truncatis, canaliculatis, 

 obscuro-violaceis." A few lines in height, and crowded together and forming quite large 

 incrusting plates. " Us sont couverts d'acicules qui sont aussi de couleur violette." The 

 polyps, as seen by these authors, were nearly retracted. Island of Vanikoro, near low- 

 tide level. (Voy. de 1'Ast., iv. 262, pi. 21, figs. 13-16 ; Blainville, Man., 500.) 



FAMILY IV. TUBIl'ORID^. 



Alcyonaria coralligena, corallis tubulatis, calcareis, aut semicakareis, 

 tubulis penitus non striatis. 



Coralligenous Alcyonaria; coralla tubular, calcareous or semicalcare- 



ous; tubes not striate within. 



i 



The animals of the Tubiporidre do not differ essentially, as regards 

 structure, from those of the Alcyonidse. The forms of the coralla 

 vary much according to the mode of budding arid growth. Budding 

 by basal shoots without upward growth in the polyps produces the 

 Aulop&rtf, similar in character to the Ilhizoxenia? ; while with acro- 

 genous growth, the ramose forms of the Telesto, or the convex clusters 

 of tubes presented by the Tubiporce, are produced. The latter are 

 united by cross plates formed at the budding process. 



The genus of fossils, Syringopora, has been arranged near the Tu- 

 biporae. The species are peculiar, principally, in having within the 

 tubes a central tubular axis, which is united to the sides by a series of 



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