﻿136 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  secondary 
  septa 
  pass 
  off 
  in 
  a 
  pinnate 
  manner 
  (fig. 
  29). 
  90° 
  toward 
  

   either 
  side 
  occur 
  the 
  " 
  alar 
  " 
  septa. 
  These 
  are 
  parallel^ 
  to 
  the 
  

   secondary 
  septa 
  which 
  branch 
  off 
  from 
  the 
  cardinal 
  septum. 
  They 
  

   have 
  a 
  single 
  series 
  of 
  secondary 
  septa 
  branching 
  off 
  from 
  them 
  on 
  

   the 
  side 
  away 
  from 
  the 
  cardinal 
  quadrants. 
  The 
  two 
  remaining, 
  or 
  

   coiuitcr 
  quadrants, 
  are 
  filled 
  with 
  parallel 
  septa, 
  which 
  branch 
  off, 
  in 
  

   a 
  pinnate 
  manner, 
  from 
  the 
  alar 
  septa, 
  and 
  are 
  completed 
  in 
  front 
  

   by 
  the 
  counter 
  septum 
  to 
  which 
  they 
  are 
  all 
  parallel. 
  

  

  One 
  of 
  the 
  four 
  '' 
  primary 
  septa 
  " 
  — 
  commonly 
  the 
  cardinal 
  sep- 
  

   tum 
  — 
  may 
  be 
  aborted, 
  leaving 
  a 
  groove 
  or 
  fossula. 
  Between 
  the 
  

   septa 
  various 
  endothecal 
  tissues 
  may 
  be 
  developed, 
  such 
  as 
  cross 
  

   plates, 
  or 
  dissepiments 
  connecting 
  adjoining 
  septa; 
  tahidac, 
  or 
  floors 
  

   more 
  or 
  less 
  completely 
  dividing 
  the 
  whole 
  inner 
  space, 
  irrespective 
  

   of 
  the 
  septa; 
  and 
  cysts, 
  which 
  form 
  a 
  vesicular 
  tissue 
  more 
  or 
  less 
  

   regularly 
  disposed 
  (Cystiphyllum). 
  The 
  cup 
  or 
  calyx 
  may 
  be 
  

   limited 
  below 
  by 
  a 
  continuous 
  floor, 
  by 
  dissepiments 
  or 
  otherwise, 
  

   or 
  it 
  may 
  be 
  limited 
  only 
  by 
  the 
  margins 
  of 
  the 
  septa, 
  the 
  spaces 
  

   between 
  the 
  septa 
  being 
  open 
  to 
  the 
  bottom 
  of 
  the 
  corallum. 
  The 
  

   costae 
  are 
  commonly 
  covered 
  by 
  a 
  concentrically 
  wrinkled 
  epitheca, 
  

   which 
  forms 
  the 
  outermost 
  wall 
  of 
  the 
  corallum. 
  

  

  In 
  colonial 
  forms 
  the 
  adjacent 
  corallites 
  commonly 
  become 
  pris- 
  

   matic 
  from 
  crowding. 
  The 
  separate 
  tliecae 
  may 
  be 
  retained, 
  or 
  

   they 
  may 
  become 
  obsolete, 
  the 
  corallites 
  becoming 
  confluent. 
  The 
  

   epithecal 
  covering 
  in 
  these 
  forms 
  is 
  commonly 
  confined 
  to 
  the 
  free 
  

   margins 
  of 
  the 
  outer 
  corallites, 
  and 
  surrounds 
  the 
  whole 
  colony 
  as 
  

   a 
  pcritheca. 
  

  

  The 
  tabulate 
  corals 
  are 
  invariably 
  compound, 
  either 
  loosely 
  or 
  

   compactly, 
  and 
  consist 
  of 
  tubular 
  or 
  prismatic 
  corallites 
  com- 
  

   monly 
  with 
  thick 
  walls, 
  which 
  in 
  certain 
  groups 
  are 
  perforated 
  by 
  

   mural 
  pores. 
  Septa 
  are 
  absent 
  or 
  but 
  slightly 
  developed, 
  sometimes 
  

   being 
  represented 
  merely 
  by 
  vertical 
  ridges 
  or 
  rows 
  of 
  spines. 
  The 
  

   number 
  is 
  usually 
  six 
  or 
  12. 
  The 
  corallites 
  are 
  crossed 
  by 
  numer- 
  

   ous 
  tabidae 
  which 
  cut 
  off 
  the 
  empty 
  portion 
  of 
  the 
  tube 
  below 
  the 
  

   polypite. 
  Other 
  endothecal 
  structures 
  are 
  absent. 
  

  

  The 
  reproduction 
  of 
  the 
  Anthozoa 
  is 
  both 
  sexual 
  and 
  asexual, 
  the 
  

   latter 
  by 
  lateral 
  or 
  calycinal 
  budding, 
  or 
  by 
  fission. 
  

  

  Genus 
  enterolasma 
  Simpson 
  

  

  [Ety.: 
  hrepov, 
  intestine; 
  eXaap-a^ 
  lamella] 
  

  

  (1900. 
  A^. 
  Y. 
  state 
  mus. 
  Bid. 
  39, 
  p. 
  203) 
  

  

  Corallum 
  simple, 
  turbinate 
  and 
  usually 
  straight. 
  Septa 
  numer- 
  

   ous, 
  those 
  of 
  the 
  earher 
  cycles 
  reaching 
  nearly 
  to 
  the 
  center, 
  where 
  

   they 
  have 
  projections 
  which 
  reach 
  to 
  the 
  center, 
  becoming 
  much 
  

   involved 
  and 
  forming 
  a 
  pseudocolumella 
  of 
  very 
  peculiar 
  appear- 
  

  

  ' 
  Parallel 
  as 
  seen 
  in 
  the 
  costae. 
  

  

  