146 



BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 



In order to separate, the two groups generically one would have to be certain 

 that the smaller avicularium of the ,!/. lineata group is only interopesial. Unfortu- 

 nately we have too few specimens to make this study. 



FIG. 3". Geuus Callopora Gray, 1848. 



A-C. Callopora lineata Linnaeus, 175S. A. Zooecia with ovicells and avicularia X 50. B. 

 Ordinary zooeeia, X 50. (A; B. After Hincks, 1880.) C. Sketch showing dietellae. (After 

 Norman, 1903.) 



D, E. Callopora craticula Alder, 1S57. D. Several zooeeia with ovicells and a single 

 zooeeium further enlarged. (After Osburn. 1912.) E. Drawing showing occurrence of the die- 

 tellae. (After Norman, 1903.) 



F, G. Callopora tenuirostris Hincks, ]ss9. F. Avicnlarian mandible, X 85. (After Waters, 

 3885.) G. Opercnlum X S5. (After Waters, 1898.) 



PI. Callopora aurita Hincks, 1877. Diagrammatic section of ovicell. (After Levinsen, 1909.) 

 ol, olocyst : oo, ooecial operculum ; op, operculum ; pi, pleurocyst ; v, vestibulum. 



I-K. Callopora dumerilii Audouin, 1820. I. Sketch showing dietellae X 27. J. Lateral wall 

 showing multiporous septulae. X 91. 1C. Distal wall with uniporous septulae, X 47. (After 

 Levinsen, 1909.) 



L, M. Callopora curvirostris Hincks, 1S61. L. Avicularium, X 50. M. Avicnlarian mandi- 

 ble, X So. (After Waters, 1898, 1885.) 



Callopora is not only one of the most important genera, but also was one of 

 the earliest to be established. It should not be confused with the Paleozoic 

 bryozoan genus Callopora Hall, 1851. for which Bassler has proposed the name 

 Hallopora. 



