GLOSSARY 



17 



Costa*: 2 (Obsolete.) Longitudinal ridge on 

 epitheca located between septa. Interseptal 

 ridge. 



Costal budding: Increase from thecal region. 



Counter: Indicates position of structures or 

 areas within thecarium; determined primar- 

 ily by parallel bordering septa; cardinal 

 quadrants lie between alar septa and coun- 



, ter septum. Abbreviated: K or CT. 



Counter-laterals: First pair of secondary sep- 

 ta; may be grouped with primary septa. Ab- 

 breviated: CL. 



Crenulate: Zig-zag or serrated epitheca of 

 corallites in compound coralla. 



Crossbar carinae: Crossbars at position of 

 septa in peripheral region if the septa are 

 absent. 



Curved: Used to modify designation of shape 

 in simple corals, typically cardinal quad- 

 rants are on concave side, counter quad- 

 rants on convex side. 



Cyathophylloid: Tendency toward radial sym- 

 metry. 



Cyathotheca: Inner wall formed by fusion of 

 down-turned margins of tabulae. 



Cylindrical: Uniform in diameter, especially 

 in mature portions. 



Cyst*: See Dissepiment or Cystosepiment. 



Cystiphylloid : Tendency toward abundant dis- 

 sepiments. 



Cystocolumella: Axial structure consisting of 

 cysts. 



Cystosepiments : Large dissepiment-like struc- 

 tures differing from dissepiments by arising 

 independently of septa ; not sharply differ- 

 entiated from dissepiments. 



Dendroid: Fasciculate with branching coral- 

 lites. 



Denticulate: Serrate axial edges of septa. 

 Acanthine in part. 



Diaphragm: 1 Transverse partition in tubular 

 area of Cleistopora and Cladopora. 



Diaphragm*: 2 (Obsolete.) See Tabula. 



Dichotomous: Branching by pairs, as in ra- 

 mose Favositidae. 



Dilated septum: Thick throughout length. 



Diphymorph: Corallite expressing new ortho- 

 gentic trend within compound corallum. 



Directive septa*: Cardinal, counter, and alar 

 septa. Primary septa. 



Discoid: Button or coin-shaped. 



Discontinuous septa: Septum with trabeculae 

 not completely fused to form longitudinal 

 plate. See Acanthine, Amplexoid, Lonsdale- 

 oid, Naic, Perforate septa, Retiform, Septal 

 cone, Septal fillets. Septal grating. 



Dissepiment: Small distally arched structure, 

 convex upward, occurring next to theca but 

 between septa, except where septa do not 

 reach theca (lonsdaleoid septa). 



Dissepimentarium: Peripheral zone of dis- 

 sepiments. 



Distal: Youngest portion. 



Endotheca*: 1 Portion of corallite encircled 

 by theca. Thecarium. 



Endotheca: 2 All structures within theca ex- 

 cept columella and septa. 



Ephebic stage: Ontogenetic stage possessing 

 specific characters (adult). 



Epitheca: External sheath of corallites; com- 

 monly indicates development subsequent to 

 formation of primary coral wall. Outer 

 wall. 



Epithecal projection: Horizontal tube con- 

 necting adjacent corallites in fasiculate col- 

 onies. Fistula. 



Everted: Periphery of calyx lower than floor. 



Exotheca: All structures outside of (but in- 

 cluding) theca. 



Exothecal scales: Small plates attached in 

 vertical rows to septal grooves. Scales. 



Extra-calicinal budding: Increases other than 

 from calyx. 



False costa*: (Obsolete.) Longitudinal ridge 

 on epitheca between septa. Interseptal ridge. 

 Costa 2. 



Fasciculate: Corallites of compound corals 

 not touching. See Dendroid, Phaceloid. 



Fiber*: (Obsolete.) See Trabecula 1. 



Fission: Separation of calyx by cleavage. 



Fission budding: Extension of features of 

 parent corallite into new corallite (polyp 

 may be separated from parent polyp by 

 closing off of area of juncture). 



Fistula: Connecting tube between neighbor- 

 ing corallites of fosciculate coralla. Epithe- 

 cal projection. 



Fossula: 1 Gap formed by abortion of a sep- 

 tum. 



Fossula: 2 Gap formed by shortening of a 

 septum, also by down-warping of tabulae 

 at same position. Siphonofossula in part. ~ 



Fovea*: (Obsolete.) See Fossula. 



Gemmation: Asexual increase. Budding. 



Geniculate: Having abrupt change in direc- 

 tion of growth. Scolecoid in part. 



Genomorphic group: Diphymorphs of coralla 

 or entire genus. 



Gerontic stage: Ontogenetic stage character- 

 istic of old age. 



Granulose: Having very small granules on 

 epitheca or tabulae. 



Term not recommended. 



