558 
BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 
Bracebridgia ( Porina ) subsulcata Sraitt, 1872, has been dredged at depths 
from 10 to 48 fathoms. Osburn found it again off the Tortugas from 16 to 19 
meters. He was kind enough to send us some specimens. The examination of their 
interior has proved to us that the species has no ascopore nor spiramen. 
Fig. 166. — Genus Bracebridgia MacGillivray, 18S6. 
A-M. Bracebridgia pyriformis Busk, 1884. A. Specimen, natural size. B. Young specimen 
growing from an incrusting base; natural size. G. Portion toward the periphery, showing 
normal zooecia. D. Two avicularian cells from the margin of a lobe. E. Older zooecia toward 
the base of the specimen, two completely closed. F. Two zooecia from incrusting part, showing 
apiculate process and oral avicularium. G. Mandible of avicularium. H. Opercula from edge 
of a lobe. (A-H after MacGillivray, 1888.) I. Zooecia with parietal areolae. X 40. J. A por- 
tion of the margin of a zoarium with two avicularia, X 55. K. Four zooecia from the basal 
aspect after removal of the basal surface, X 55. L. An avicularian mandible, X 140. M. Oper- 
culum, X 140. (I-M after Levensen, 1909.) 
N. Bracebridgia ( Poricella ) elongata Canu, 1907. Outlines, X 80. (After Canu, 1907.) 
ae, peristome of a zooecium; ai, aperture of a zooecium ; ge, peristome of a gonoecium ; 
gi. aperture of a gonoecium ; pp, frontal micropore seen from the interior. 
BRACEBRIDGIA ACULEATA, new species. 
Plate 71, figs. 10-12. 
D escri/ption . — The zoarium is free, bilaminar, composed of two lamellae placed 
back to back and separable. The zooecia are elongated, fusiform, distinct, sep- 
arated by a furrotv and surrounded by an especial line of areolae; the frontal is 
