18 



CHOUTEAU CORALS 



Growth line: Fine encircling irregularity on 

 theca. 



Haploid: Simple conical coral. 



Holotheca: Outer wall or common investing 

 sheath in massive coralla. Peritheca. 



Horizontal skeletal element: Structure 

 formed at base of living coral. 



Horizontal bar*: See Tabula, especially in 

 Favositidae. 



Horseshoe dissepiment: Domed dissepiment 

 resting on flat horizontal base near inner 

 edge of dissepimentarium. 



Hystero-brephic: Very early stage with pos- 

 sible omission of characters in offset coral- 

 lite. 



Hystero-corallite: Skeleton of offset corallite 

 formed after the proto-corallite. 



Hystero-ephebic: Adult stage with possible 

 omission of characters, in offset corallite. 



Hystero-neanic: Early stage with possible 

 omission of characters, in offset corallite. 



Incomplete tabula: Not extending across the- 

 carium. 



Increase: Asexual growth. Budding, Gemma- 

 tion. 



Infundibuliform: Cone- or funnel-shaped. 



Inner wall: Solid longitudinal structure sim- 

 ulating internal theca. See Phyllotheca, 

 Sclerotheca, Cyathotheca, Stereotheca. 



Inosculation*: Joining. Anastamosing. 



Interior wall*: (Obsolete.) See Inner wall. 



Intermural increase: Lateral increase occur- 

 ring in cerioid coralla at angles between 

 walls. 



Intermural pore: Perforation of only one of 

 two neighboring corallite walls in massive 

 coralla. 



Interrupted septum*: Not reaching theca. 

 Lonsdaleoid septum. 



Interseptal ridge: Vertical ridge on exterior 

 of epitheca between adjacent septa. Pseudo- 

 septum in part, Pseudocosta, Ruga, Costa 2. 



Interseptal space: Portion of lumen between 

 two adjacent septa. 



Interstitial budding: Insertion of new coral- 

 lites in interstices between corallites. 



Invaginated: Tabular arching in reverse of 

 usual manner. 



Lamella: 1 Short axially located plate resem- 

 bling septum. 



Lamella*: 2 (Obsolete.) See Septum. 



Lateral budding*: Budding from some point 

 in walls. Parietal budding. 



Lateral fossula*: Gap between an alar sep- 

 tum and next adjacent counter septum (ob- 

 solete). Alar pseudo-fossula. 



Lateral increase: Apparent growth of new 

 corallite from epitheca of parent. 



Left counter quadrant: Position of thecarium 

 between counter septum and left alar sep- 

 tum w^hen counter is orientated away from 

 observer. 



Long septum: Extending almost to axis. 



Lonsdaleoid: Having septa withdrawn from 

 periphery, outer space filled by dissepiments. 

 Recessive septa in part. 



Lonsdaleoid dissepiments: Abut against either 

 epitheca or other dissepiments because of 

 retreat of septa toward axis. 



Lonsdaleoid septum: Not extending to peri- 

 phery. Recessive septum. 



Lumen: Space within thecarium not occupied 

 by skeletal elements. 



Major septa: Protosepta and metasepta. 



Marginal budding*: Budding from margin or 

 from definite points near base. Basal bud- 

 ding. 



Massive: Compound corals with actually 

 touching corallites. See Cerioid, Plocoid, 

 Prismatic. 



Medial lamella: Axial plate generally in car- 

 dinal-counter plane. 



Medial plate*: Bisects axial column in car- 

 dinal-counter plane, may be continuous with 

 cardinal septum or counter septum, or 

 neither. Axial plate. 



Metasepta: Long septa resembling protosepta 

 but in intermediate position. Secondary 

 septa. 



Minor septa: Short septa inserted subsequent 

 to and alternating with major septa. Ter- 

 tiary septa, in part. 



Mural pore: Perforation extending through 

 epithecas of two adjacent corallites, as in 

 Favositidae. 



Naic septum: Formed in part by transverse 

 plates connected by rods or granules of 

 sclerenchyme. 



Neanic stage: Ontogenetic stage between 

 brephic and ephebic stages. 



Neotissue: New tissue, commonly thicker 

 than atavo-tissue. 



Nepionic stage: Ontogenetic stage in which 

 the six protosepta are formed. Brephic stage. 



Offset: Corallite formed later than and from 

 proto-corallite. 



Operculum: Lid covering calyx. 



Outer wall: External sheath of corallite. Epi- 

 theca. 



Outer zone*: See Dissepimentarium. 



Pali*: Short vertical plates located axially. 

 Lamella 1. 



Term not recommended. 



