NORTH AMERICAN EARLY TERTIARY BRYOZOA. 271 



FIG. 75. Family Cellariidae Hincks, 1880. 



A-D. Cellaria flstulosa Linnaeus, 1768. A. Profile view of larva. B. Aboral face. C. Lateral 

 face. (A-C after Calvet, 1900.) 



&a, palette of pigmentary spots of the larva. plv, vibratile plume, 

 co?, calotte (terminal bud). spa, palleal furrow. 



co. corona. xgs, superior glandular system. 



fc, ciliated cleft. ta, pigment spots. 



D. Longitudinal frontodorsal section of a bryozoid. (After Calvet, 1900.) 

 <in. anus. <ji, tentacular sheath. 



on, cardiac region of the stomach. U, hypostege. 



caec, stomachic caecum. mpd, parietal diaphragm muscles. 



chi, incubation cavity. mupae, periesophagial muscular fibers. 



cry, cryptocyst. muop, muscles of the operculum of the ovicell. 



d, vaginal diaphragm. oe, external orifice of the ovicell. 



t, embryo. oi, internal orifice of the ovicell. 



ect, ectocyst. op, operculum. 



el, interzooecial partition. pic, communication plates (septulae). 



eph, hypostegial epiderm (endocyst). rm, mesenchyme covering of the polypide. 



est, stomach. s, membraneous sac in which the embryo is 



fnc, central funicular cord. evolved. 



gn, nerve ganglion. t, tentacles. 



E. Cellaria rigida MacGillivray, 1S87. Longitudinal section through a zoarium, X 64. (After 

 Hennig, 1910.) 



F. Cellaria atlantica Busk, 1884. Interior from the basal aspect after the removal of the 

 basal surface. The cavities of the zooecia and the ovicells are visible and here and there ex- 

 ternal ridges which divide the frontal surface into areas. (After Levinsen. 1909.) 



G. H. Cellaria dennanti MacGillivray, 18S7. G. Section X 85, showing the large nvicularian 

 chamber, also the outer membranes united at certain points only, and between which there has 

 been a calcareous deposit; the basal portions of the intermediate zooecia are shown at c. In the 

 lower zooecium the full number of tentacles is not shown. 



H. Section of tentacles, X 750. (G, H after Waters, 1904.) 



I-X. Opercula (to the left) and aviculariau mandibles (to the right) of Cellaria. (I, M 

 after Waters, 1885 and 1904, and N after Calvet, 1910.) 



