﻿PROTOZOA. 
  

  

  RECEPTACULITES 
  De 
  France. 
  

   Beceptaculites 
  sttbttjebinatus. 
  

  

  Plate 
  3, 
  Figs. 
  1-3. 
  

  

  .Receptaculites 
  subturbinatus 
  Hall. 
  Transactions 
  of 
  the 
  Albany 
  Institute, 
  vol. 
  

   iv, 
  p. 
  224. 
  Abstract, 
  p. 
  30; 
  May, 
  1863. 
  

  

  Body 
  small, 
  or 
  sometimes 
  approaching 
  tlie 
  medium 
  size 
  of 
  

   species 
  of 
  this 
  genus 
  ; 
  subhemispheric 
  or 
  depressed 
  subtur- 
  

   binate 
  ; 
  base 
  of 
  attachment 
  broad 
  ; 
  upper 
  side 
  flat 
  or 
  slightly 
  

   depressed 
  in 
  the 
  middle 
  for 
  a 
  space 
  of 
  about 
  half 
  the 
  diameter, 
  

   thence 
  curving 
  outwards 
  and 
  downwards 
  to 
  the 
  periphery 
  ; 
  

   cell-apertures 
  on 
  the 
  sides 
  and 
  exterior 
  portions 
  of 
  the 
  upper 
  

   surface 
  distinctly 
  rhomboidal, 
  the 
  width 
  from 
  the 
  lateral 
  

   angles 
  being 
  greater 
  than 
  the 
  height 
  ; 
  cell-margins 
  very 
  prom- 
  

   inent 
  ; 
  the 
  cells 
  in 
  the 
  central 
  portion 
  obscure. 
  

  

  This 
  small 
  species, 
  in 
  the 
  specimen 
  originally 
  described, 
  has 
  

   a 
  diameter 
  of 
  nearly 
  25 
  mm., 
  with 
  a 
  height 
  about 
  half 
  as 
  

   great. 
  It 
  differs 
  essentially 
  from 
  any 
  of 
  the 
  species 
  previously 
  

   known 
  to 
  me, 
  but 
  approaches 
  in 
  character 
  to 
  the 
  R. 
  liemi- 
  

   sphericus 
  of 
  the 
  Magara 
  formation 
  of 
  Wisconsin. 
  

  

  ASTYLOSPONGIA 
  Roemer. 
  

  

  ASTYLOSPONGIA 
  PEJEMOESA 
  Goldf. 
  

  

  Plate 
  3, 
  Figs. 
  4-11 
  and 
  14. 
  

  

  Siphonia 
  prcemorsa 
  Goldf. 
  Petref. 
  Germ., 
  i, 
  17, 
  t. 
  6, 
  f. 
  9. 
  1826. 
  

  

  Siphonia 
  excavata 
  Goldf. 
  Petref. 
  Germ., 
  i, 
  17, 
  t. 
  6, 
  f. 
  8. 
  1826. 
  

  

  Siphonia 
  prcemorsa 
  Hisinger. 
  Leth. 
  Suec, 
  94, 
  t. 
  26, 
  f. 
  7. 
  1837. 
  

  

  Siphonia 
  prcemorsa 
  Eichwald. 
  Silur. 
  Schichtensyst. 
  in 
  Esthland, 
  209. 
  

  

  Siphonia 
  prcemorsa 
  Maximilian. 
  Herzog 
  von 
  Leuchtenberg, 
  Beschreibung 
  einiger 
  

   neuen 
  Thierreste 
  der 
  Urwelt 
  aus 
  den 
  Silurischen 
  Kalkschichten 
  von 
  Zarskoje- 
  

   'Selo. 
  St. 
  Petersburg, 
  1843, 
  24. 
  

  

  Siphonia 
  prcemorsa 
  Ferd. 
  Roemer.. 
  i. 
  Leonh. 
  u. 
  Bronn's 
  Jahrb. 
  1848, 
  684. 
  

  

  Siphonia 
  prcemorsa 
  Ferd. 
  Roemer. 
  i. 
  Letheea 
  geognost. 
  ed. 
  3 
  Th. 
  ii, 
  154, 
  t. 
  27, 
  1. 
  

   21. 
  1852-1854. 
  

  

  Siphonia 
  excavata 
  Bronn. 
  i. 
  Leth. 
  geogn. 
  ed., 
  3 
  Th. 
  v, 
  75. 
  1851-1852. 
  

  

  Siphonia 
  stipitata 
  Hisinger. 
  Leth. 
  Suec. 
  94, 
  t. 
  xxvi, 
  f. 
  8. 
  

  

  Jerea 
  excavata 
  d'Orbigny. 
  Prodr. 
  de 
  Pal. 
  strat. 
  ii, 
  286. 
  1850. 
  

  

  Astylospongia 
  prcemorsa 
  Roemer. 
  "Die 
  Silurische 
  Fauna 
  des 
  Westliohen 
  Ten- 
  

   nessee, 
  p. 
  8, 
  pi. 
  1, 
  figs. 
  1, 
  la-le. 
  1860. 
  

  

  Astylospongia 
  prcemorsa 
  (Goldf.) 
  Hall. 
  Trans. 
  Alb. 
  Inst., 
  vol. 
  iv, 
  p. 
  228. 
  

   Abstract, 
  p. 
  34 
  ; 
  May, 
  1863. 
  

  

  