NORTH AMERICAN EARLY TERTIARY BRYOZOA. 
699 
Fig. 229. — Anatomy of tlie family Crisiidae Johnston, 1847. 
*A-I. Crisia denticulata Lamarck, 1836. A. Zoarium, natural size. B. Polypide isolated from 
the tube. (After Milne-Edwards, 1838.) a, tentacles; b, tentacular sheath; c, retractor muscle 
of the polypide; d, alimentary tube; e, anus. C. Portion of longitudinal section through the 
polypide. The contour of the cardiac region which has not been covered by the section is repre- 
sented by stippling. D. Transverse section of a branch of the colony. E. Tentacle, transverse 
section. F. Strip of a tangential section of the ectocyst. Each of the pores corresponds to a 
spherular leucocyte. G. Portion of a longitudinal section of the wall of the ovieell. The spheru- 
lar leucocytes are always abundant in the vicinity of the pores. H. Leucocytes of the general 
cavity of a zooeeium. (C-H after Calvet, 1900. ) cocc, stomachic coecum ; cl, interzooecial par- 
tition; ect, ectocyst; ect', ect", the two cuticular leaves of the ectocyst; cm, mesenchyme; ep, 
endocyst; eph, epiderm of the pharynx; cst, stomach; etc, external tentacular epithelium; eti, 
internal tentacular epithelium; gt, tentacular sheath; mupoe, muscular perioesophagial fibers; 
mugr, great retractor muscle; met, anhistous membrane of the tentacles; oes, oesophagus; ph, 
pharynx ; pg, pylorus ; psp, protospermatoblast morales ; re, rectum ; sm, mesenchymatous lining 
of the polypide; t, tentacles. I. Section through the inner wall of a zooeeium showing the eon- 
nectons from zooecum to zooecum (c) X 330. (After Waters, 1914.) 
J. Crisia geniculata Milne-Edwards, 1878. Polypide with the tentacles evaginated. (After 
Milne-Edwards, 1838.) a, tentacles garnished with vibratile cilia; b, stomach; c, intestine; d, 
anus ; e, retractor muscle of the polypide. 
K. Crisia elongate Milne-Edwards, 1S38. Proximal end of zooeeium, showing connection (a) 
to the two neighboring zooecia, through numerous tubes in which there is a septum in the middle 
of the zooecial walls (tv), X 250. (After Waters, 1914.) 
L. Crisidia cornuta Ellis, 1755. Decalcified segment. (After Pergens, 1899.) a. j., link of 
juncture ; est, stomach ; ep, ectocyst ; p, parencliyme. 
