630 BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 



Genus CONESCHARELLINA D'Orbigny, 1851. 



1851. ConescJiarellina D'OKRIGNY, Paleontologie franchise. Terrain Cretace, vol. 5, p. 446. 



The zoarium with lunoecia. The zoaria, which have the form of a low cone 

 or an arched disk, only show a single layer of zooecia. while their inner cavity is 



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Fio. 192. Genus Conescharellina D'Orbigny, 1851. 



A-H. Conescharellina canceUata Busk, 1852. A. Zoarium, natural size and magnified. 

 B. Internal face magnified. (A, B after MacGillivray, 1895.) C. Zooecia, X 25. D. Aperture, 

 X 50. (C, D after Waters, 1882.) E. Avicularian mandible, X 85 and X 250. F. Operculum, 

 X 85. (E, P after Waters, 1S87.) G. Ovicell, X 55. H. Ovicell from the side, X 55. (G, H 

 after Leviusen, 1909. ) 



I-N. Conescharellina angulopora Tenison-Woods, 1880. I. Between the two avicularia is 

 seen one of the peculiar crescentic apertures belonging to certain kenozooecia (zooecia of com- 

 pensation), X 75. J. A crescentic aperture and two avicularia, X 75. K. Operculum, X 100. 

 L. A transverse section of the operculum, X 200, M. Aperture, X 75. N. Avicularian mandible, 

 X 200. (I-N after Levinsen, 1909.) 



O-P. Conescharellina incisa Hincks, 1881. O. Avicularian aperture, X 25. P. Oral aper- 

 ture, X 25. (O, P after Waters, 1887.) 



Q. Conescharellina philippinensis Busk, 1852. Five zooecia are seen from the basal side 

 (after removal of the frontal wall), showing a number of avicularian chambers, which are con- 

 nected partly with the zooecial surface and partly with each other through septules and pore 

 chambers. There is also seen one of the peculiar kenozooecia, which are provided with a narrow 

 semilunate aperture, X 75. (After Levinsen, 1909.) 



occupied by numerous avicularia placed in horizontal layers; ovicells may occur. 

 (After Levinsen, 1909.) The apertura has a distal rimule. 



