NORTH AMERICAN EARLY TERTIABY BRYOZOA. 



371 



FIG. 112. Anatomy of the Hippoporae. 



A-L, N. Hii>i>o<Hi>losia paUasianu Moll, 1S03. A. Sketch showing anatomy. B. Portion of a 

 longitudinal section in the region of the pharynx. C. Transverse section of a tentacle. 



D. Transverse section of the lophophore passing through the orifice of the circular canal. 



E. Longitudinal and transverse sections of the vaginal glandular organ. F. Transverse section 

 of a bryozooid. G. Median sagittal section of an embryo of this species. H. Tangential section 

 of a multiporous septula. (A-H after Calvet. 1900.) 



an, anus; 



co, cardiac region of the stomach ; 

 cal, calotte (terminal bud) : 

 caec, caecum ; 

 to, corona ; 



cry, cryptocyst (skeleton) ; 

 ct, tentacular canal ; 

 (I, vaginal diaphragm ; 

 dap, deutospermntoblast morula ; 

 em, rnesenchyrne elements; 

 c/nii, mesoderinal thickening; 

 epe, ectodermal thickening; 

 cst, stomach ; 



etc, external tentacular epithelium ; 

 ep, epiderm of the hypostege; 

 glv, vaginal glands (=opercular glands of 



Waters and Harmer). 

 mnop, opercular muscles; 

 ni up, parietal muscles; 

 mupd, parietal-diaphragm muscles; 

 mupli, peripharyngeal muscular fibers ; 

 mupoe, periesophageal muscular fibers; 



I-L. Lateral face, ( T ) oral face, I J ) 

 (After Barrels, 1877.) 

 c, corona ; 

 ce, cavity between the two branches of the 



stomach ; 



cd, digestive cavity ; 

 cst. stomach ; 

 ft, flagellum ; 

 ins, oral (labial) mesoderm ; 



inupo, parieto- vaginal muscles; 



np, peripharyngeal nerves; 



or, orifices of the circular canal ; 



ocs, esophagus ; 



1 1 ca, ovary ; 



pc, septule ; 



ph, pharynx ; 



lilc, communication plates ; 



plv, vibratile plume; 



jipJr, papilla of vibratile plume; 



psp, protospermatoblast morulae ; 



py, pylorus ; 



re, rectum ; 



nn, mesenchyme covering of polypide; 



sal, inferior glandular system ; 



sf/s, superior glandular system ; 



si, internal sac ; 



xp, spermatoblast morulae ; 



spv, ciliated tritospermatoblast morulae r 



tin, mesenchyme; 



/r, transverse muscular fibers of the circular 



canal 

 aboral face, (K) dorsal face, (L) of the larva. 



o, ciliated cleft. 



PL, ciliated plume; 



pli, pharynx ; 



RV, border of the terminal bud ; 



si, separating furrow ; 



.. oral or vestibular face; 



rt, terminal bud (=cnlotte of Oalvet). 



in i, aboral mesoderm ; 



N. Young zooeciurn. The compensatrix I c. s.) is still small. The pores extend around the 

 distal margin of the operculum. (After Harmer. 1902.) 

 6 polypide bud ; p. m.. parietal muscles ; 



-l, occlusor muscles of operculum; pvm, parieto-vaginal muscles; 



opercular glands (=vaginal glands of s. c., compensatrix. 

 Calvet) ; 

 M. Ltpralin lintuli/x Jullieu, 1903. Sketch of zooeoium, showing terminology. 



