﻿514 
  H. 
  AXLEYNE 
  NICHOLSON 
  ON 
  SPECIES 
  OE 
  CHJ3TETES 
  

  

  Fig. 
  4. 
  Fragment 
  of 
  Chcetetes 
  attritus, 
  Nich., 
  of 
  the 
  natural 
  size. 
  

  

  4 
  a. 
  Portion 
  of 
  the 
  same 
  enlarged, 
  showing 
  the 
  calices 
  and 
  the 
  small 
  solid 
  

  

  tubercles. 
  

  

  5. 
  A 
  fragment 
  of 
  Chcetetes 
  pulchellus, 
  Edw. 
  & 
  H., 
  of 
  the 
  natural 
  size. 
  

  

  5a. 
  Portion 
  of 
  the 
  same, 
  enlarged, 
  to 
  show 
  the 
  groups 
  of 
  larger 
  corallites. 
  

  

  5 
  b. 
  Portion, 
  still 
  further 
  enlarged, 
  showing 
  the 
  few 
  minute 
  intermediate 
  

  

  tubuli. 
  

  

  6. 
  Fragment 
  of 
  Chcetetes 
  Fletcheri, 
  Edw. 
  & 
  H., 
  of 
  the 
  natural 
  size. 
  

  

  6 
  a. 
  Portion 
  of 
  the 
  same, 
  enlarged. 
  

  

  7. 
  Fragment 
  of 
  Chcetetes 
  gracilis, 
  James, 
  of 
  the 
  natural 
  size. 
  

  

  7 
  a. 
  Fragment 
  of 
  the 
  same, 
  enlarged, 
  showing 
  the 
  small 
  crowded 
  calices 
  

  

  and 
  very 
  minute 
  intermediate 
  tubuli. 
  

  

  8. 
  Fragment 
  of 
  Chcetetes 
  delicatulus, 
  Nich., 
  of 
  the 
  natural 
  size. 
  

  

  8 
  a. 
  Fragment 
  of 
  the 
  same, 
  showing 
  a 
  stem 
  which 
  terminates 
  in 
  a 
  rounded 
  

  

  swollen 
  extremity, 
  and 
  apparently 
  springs 
  from 
  a 
  horizontal 
  foot- 
  

   stalk, 
  of 
  the 
  natural 
  size. 
  

  

  8 
  b. 
  Portion 
  of 
  fig. 
  8, 
  enlarged. 
  

  

  9. 
  Fragment 
  of 
  a 
  large 
  individual 
  of 
  Chcetetes 
  ? 
  noduTosus, 
  Nich., 
  of 
  the 
  

  

  natural 
  size. 
  

  

  9 
  a. 
  Portion 
  of 
  the 
  same, 
  enlarged. 
  

  

  10. 
  Fragment 
  of 
  Chcetetes 
  Jamesi, 
  Nich., 
  of 
  the 
  natural 
  size. 
  

  

  10 
  a. 
  Portion 
  of 
  the 
  same, 
  enlarged, 
  showing 
  one 
  of 
  the 
  stellate 
  spaces. 
  

   106. 
  Another 
  portion 
  of 
  the 
  same, 
  still 
  further 
  enlarged, 
  showing 
  the 
  

  

  thick-walled 
  calices 
  and 
  their 
  granulated 
  borders. 
  

  

  11. 
  Fragment 
  of 
  Chcetetes 
  rhombicus, 
  Nich., 
  of 
  the 
  natural 
  size. 
  

  

  11 
  a. 
  Portion 
  of 
  the 
  same 
  where 
  the 
  cells 
  are 
  rhombic 
  and 
  arranged 
  in 
  

  

  diagonal 
  rows, 
  enlarged. 
  

  

  11 
  b. 
  Another 
  portion 
  of 
  the 
  same, 
  where 
  the 
  cells 
  are 
  hexagonal, 
  enlarged. 
  

  

  12. 
  'Chcetetes 
  papillatus, 
  M'Coy, 
  growing 
  upon 
  a 
  Strophomena, 
  of 
  the 
  

  

  natural 
  size. 
  

  

  12 
  a. 
  A 
  few 
  cells 
  of 
  the 
  same, 
  highly 
  magnified. 
  

  

  12 
  b. 
  A 
  portion 
  of 
  the 
  same, 
  not 
  so 
  greatly 
  enlarged, 
  showing 
  one 
  of 
  the 
  

  

  tubercles. 
  

  

  13. 
  Chcetetes 
  corticans, 
  Nich., 
  growing 
  on 
  an 
  Orthoceras, 
  of 
  the 
  natural 
  size. 
  

  

  13 
  a. 
  Portion 
  of 
  the 
  same, 
  enlarged, 
  showing 
  one 
  of 
  the 
  tubercles. 
  

  

  14. 
  Fragment 
  of 
  another 
  specimen 
  of 
  C. 
  corticans, 
  in 
  which 
  the 
  tubercles 
  

  

  are 
  smaller 
  and 
  not 
  so 
  pronounced, 
  growing 
  on 
  a 
  large 
  Orthoceras, 
  

   of 
  the 
  natural 
  size. 
  

  

  15. 
  Chcetetes 
  Ortoni, 
  Nich., 
  growing 
  on 
  Strophomena 
  altemata, 
  of 
  the 
  

  

  natural 
  size. 
  

   15 
  a. 
  Portion 
  of 
  the 
  same, 
  enlarged, 
  showing 
  the 
  tubercles. 
  

   15 
  b. 
  Portion 
  of 
  the 
  same, 
  enlarged 
  further, 
  showing 
  the 
  granulated 
  margins 
  

   of 
  the 
  calices. 
  

  

  Plate 
  XXX. 
  

   Fig. 
  1. 
  Fragment 
  of 
  Chcetetes 
  ? 
  clathratulus, 
  James, 
  enlarged, 
  showing 
  the 
  dia- 
  

   gonal 
  arrangement 
  of 
  the 
  cells 
  and 
  the 
  tubercles. 
  

   1 
  a. 
  Section 
  of 
  the 
  same, 
  enlarged, 
  showing 
  the 
  two 
  strata 
  of 
  tubes 
  springing 
  

   from 
  a 
  common 
  lamina. 
  

  

  1 
  b. 
  Portion 
  of 
  the 
  same, 
  enlarged 
  still 
  further. 
  

  

  2. 
  Fragment 
  of 
  Chcetetes 
  frondosus, 
  D'Orb. 
  (?), 
  of 
  the 
  natural 
  size, 
  showing 
  

  

  the 
  stellate 
  spaces. 
  

  

  2 
  a. 
  Section 
  of 
  the 
  same, 
  enlarged, 
  showing 
  the 
  two 
  strata 
  of 
  corallites 
  

  

  arising 
  from 
  a 
  common 
  membrane. 
  

  

  2 
  b. 
  Portion 
  of 
  the 
  same, 
  enlarged, 
  showing 
  the 
  calices 
  and 
  a 
  stellate 
  space. 
  

  

  3. 
  Fragment 
  of 
  Chcetetes 
  mammulatus, 
  Edw. 
  & 
  H., 
  natural 
  size. 
  

  

  3 
  a. 
  Portion 
  of 
  the 
  same, 
  enlarged. 
  

  

  4. 
  Upper 
  surface 
  of 
  Chcetetes 
  discoideus, 
  James, 
  natural 
  size. 
  

  

  4 
  a. 
  Under 
  surface 
  of 
  the 
  same, 
  natural 
  size. 
  

   4 
  b. 
  Profile 
  view 
  of 
  the 
  same, 
  natural 
  size. 
  

  

  4 
  c. 
  Portion 
  of 
  the 
  upper 
  surface 
  of 
  the 
  same, 
  enlarged. 
  

   4 
  d. 
  Portion 
  of 
  the 
  lower 
  surface 
  of 
  the 
  same, 
  enlarged. 
  

  

  