206 
BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 
1891. Onychocella angulosa Waters, North Italian Bryozoa, Quarterly Journal of the 
Geological Society, vol. 47, p. 9. (not synonymy). 
1S95. Onychocella angulosa Neviani, Bryozoi fossili Farnesina, Paleontograpliica Italica, 
vol. 1, p. 97, pi. 5, fig. 7. 
1904. Onychocella angulosa Canu, Bryozoaires Tertiaires Tunisie, Explorations Scientifiques 
rle la Tunisie, p. 18, pi. 34, fig. 2. 
1907. Onychocella angulosa Canu, Bryozoaires des Terrains tertiaires des environs de Paris, 
Annales de Paleontologie, vol. 2, p. 21, pi. 3, fig. 11. 
1905. Onychocella angulosa Canu, Bryozoaires fossiles des Terrains du Sucl-Ouest de la 
France, Bulletin Societe geologique de France, ser. 4, vol. 6, p. 513, pi. 12, fig. 13. 
1909. Onychocella angulosa Norman, The Polyzoa of Madeira, Journal Linnean Society 
Zoology, vol. 30, p. 293, pi. 37, fig. 1. 
1912. Onychocella angulosa Canu, Bryozoaires helvetiens de l’Egypte, Memoires de l’lnsti- 
tut egyptien, vol. 6, p. 201, pi. 10, fig. 10. 
\ ■ [Ao=0. 16-0.20 mm. 
Measurements .— Opesia niQnon /tut n \ 
[lo— 0.18-0.20 mm. (Max. 0.26.) 
„ . fZs=0.4:0-0.60 mm. 
Zooecia ; n ~ 
[fe=0.40-0.60 mm. 
Opesium of the ] A<?«.=0.20 mm. ~ . ... 
, n • 7 Onychocellanum 
onychoceliarrum J tow=0.10mm. 
\Lon— 0.60 mm. 
[ Ion— 0.28-0.30 mm. 
Affinities and variations . — The zooecia are hexagonal, but of an irregularity 
which defies all constant micrometric measurements. The polypedian convexity 
is hardly apparent and the opesiular indentations are not symmetrical. The opesium 
is sometimes transverse, but more often somewhat elongated. 
The opesium of the onychocellarium often' has a small proximal sinus, larger 
in the interior than on the exterior as in the recent specimens. 
The presence of this species off the Madeira Islands and in the Priabonian of 
Europe rendered it probable that it would be found in America. However, it is 
rare in the latter country. 
Occurrence .. — Middle Jacksonian: Wilmington, North Carolina (rare); near 
Lenuds Ferry, South Carolina (rare). 
Geological distribution . — In France, this species makes its appearance in the 
Lutetian of the Paris Basin and the Pyreneean Basin (Canu). It exists abundantly 
in all the younger stages which border the Mediterranean in France, Italy, Algeria, 
Tunis, and Egypt. * 
Habitat . — Mediterranean (to a depth of 80 meters). Atlantic: Madeira Islands 
(50-70 fathoms). Pacific: Off China. The species seems to be an inhabitant of 
the warm seas. 
Plesioiypes. — Cat. No. 63964, U.S.N.M. 
ONYCHOCELLA GEORGIANA, new species. 
Plate 17, figs. 15, 16. 
Description . — The zoarium incrusts rocks. The zooecia are hexagonal, elon- 
gated, distinct, but confluent among themselves. The cryptocyst is finely granular, 
concave, smaller than the opesium; the opesium is elliptical or oval with a convex 
