NORTH AMERICAN EARLY TERTIAIll' BRYOZOA. 



75 



FIG. 17. Family Eleetriuidae D'Orbiguy, 1851. 



A-F. Elect ru pilosa Linnaeus, 175S. (Larval form=Uyi>hunautcs cumprcssus Klireii- 

 berg, 1833.) 



A, B. Lateral views of larva, X 50, immediately after occlusion. 



C. Larva, X 50, a little before fixation. 



D. View from front, X 50. (A-D, After Barrois, 1877.) 



c, corona. 



cc, cavity of segmentation, 

 re, cavity of the stomach. 

 coe, lateral diverticulum of the stomach cavity. 

 coq, shell. 

 cst, stomach. 

 /, fossette of the plume. 



/i, portion charged with elements (hepatic?) 

 under the enigmatic organ of Schneider. 



mi, aboral mass. 



o, mouth of the gastrula. 



I'll, pharynx. 



/'/, ciliary plume. 



r. large retractor muscles. 



-. oral face. 



si. separating furrow of the terminal bud. 



rt. terminal bud. 



E. Sketch showing anatomy of polypule. (After Calvet. 1900.) 



ocs, oesophagus. 



nit. intertentacular organ. 



<>l>. operculum. 



ova, ovary. 



!>!/. pylorus. 



re, rectum. 



/>, spermatoblast morulae. 



n, anus. 



fa, cardia. 



caec, caecum. 



d, vaginal diaphragm. 



i at, stomach. 



muop, opercular muscles. 



iinii/i', large retractor muscles of the polypide 

 (or of the lophophore). 



mitpd, parietal or expulsor muscles of the poly- 

 pide. 



F. Longitudinal section of the intertentacular organ. (After Calvet, 1900.) 



ct, tentacular canal. met, anhistous membrane of the tentacles. 



ete, external tentacular epithelium. oi, superior orifice. 



cti, internal tentacular epithelium. as, superior cavity, 



i, inferior cavity. re, rectum. 



G, H. Sfcmlranipora menibranacea Linnaeus, 175S. 



Two drawings exhibiting the anatomy of the polypide, X 100. 



(After Nitsche, 1871.) 



c, cardinl part of the stomach. 



d, interior diaphragm of the tentacular sheath. 

 ec, 'ectocyst. 



en, endocyst. 

 oes, esophagus. 



op, fold of the opercular valve. 

 opm, muscles of the operculum. 

 P, pyloric part of the stomach. 

 inn. parietal or extensor muscles of the poly- 

 pide. 



R, rectum. 



KM, retractor muscles of the lophophore (or 



of the polypide). 

 mill, septula. 

 st, stomach. 

 T. tentacles. 

 tscli, tentacular sheath. 

 x. mesenchyme. 



