146 
BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 
In order to separate the two groups genetically one would have to be certain 
that the smaller avicularium of the M. lineata group is only interopesial. Unfortu- 
nately we have too few specimens to make this study. 
Fig. 37. — Genus Callopora Gray, 1848. 
A-C. Callopora lineata Linnaeus, 1758. A. Zooecia with ovicells and avicularia X 50. B. 
Ordinary zooecia, X 50. (A, B. After Hindis, 1880.) C. Sketch showing dietellae. (After 
Norman, 1903.) 
D, E. Callopora craticula Alder, 1857. D. Several zooecia with ovicells and a single 
zooecium further enlarged. (After Osburn, 1912.) E. Drawing showing occurrence of the die- 
tellae. (After Normau, 1903.) 
F, G. Callopora tenuirostris Hincks, 18S9. F. Avicularian mandible, X 85. (After Waters, 
1S85. ) G. Operculum X 85. (After Waters, 1898.) 
H. Callopora aurita Hincks, 1877. Diagrammatic section of ovicell. (After Levinsen, 1909.) 
ol, oloc-yst ; oo, ooecial operculum ; op, operculum ; pi, pleurocyst ; v, vestibulum. 
I-K. Callopora dumerilii Audouin, 1826. I. Sketch showing dietellae X 27. J. Lateral wall 
showing multiporous septulae, X 91. K. Distal wall with uniporous septulae, X 47. (After 
Levinsen, 1909.) 
L, M. Callopora curvirostris Hincks, 1861. L. Avicularium, X 50. M. Avicularian mandi- 
ble, X 85. (After Waters, 1898, 1885.) 
Gallo fora 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 Callofora Hall, 1851. for which Bassler has proposed the name 
Hallofora. 
