CHARACTERS OF FAMILIES, ETC. 



SUB-KINaDOM— ZOOPHYTA. SECTION— EADIA.T A. 



Class — Polypi. 

 AxiMAL fixed, Iiaving no locomotive organs. Provided Avith a 

 circle of retractile tentaculse around the mouth, and a central 

 gastric cavity, not communicating with an anus, and containing 

 the reproductive organs when these exist. 



Sub-class CORALLARIA. 



Polypi possessing distinct internal reproductive organs. 



Order — Alcvo.varia. 

 Polypi with eight tentacles, which are fringed on their sides 

 with lateral pinnae. 



Family — GorgoxidvT:. 

 Polypi provided with a thick, suberous coenenchyma, sur- 

 rounding a central stem that is adherent to an extraneous body 

 by its basis, and is formed of epidermic sclerenchyma. 



Sub-family — Isin/E . 

 Common axis articulated, or composed of segments, the 

 structure of which differs alternately. 



Sub-order — -Zoantharia sclerodermata. 

 Polypi with conical, tubular, simple or arborescent tentacula. 



Section — Madreporaria aporosa. 

 Corallum composed essentially of lamellar dermic scleren- 

 chyma, with the septal apparatus highly developed, completely 

 lamellar, and primitively composed of six elements ; no tabulae. 



Family — Turbixolid^. 

 Corallum usually simple, not fissiparous. Interscptal loculi 

 extending from the top to the bottom of the visceral chamber^ 

 ii 



