558 



BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 



Bracc~bridgia (Porina) subsulcata Smitt, 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. 



I.X40 



iNx80 



FIG. 166. Genus Bracebri&gia MacGillivray, 1886. 



A-M. Bracebridgia pyriformis Busk, 1884. A. Specimen, natural size. B. Young specimen 

 growing from an incrusting base; natural size. C. 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 avicularinm. 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.) 



X. Bnn-clriiJgiii (PoriccJIa) clongata Canu, 1907. Outlines, X 80. (After Canu, 1907.) 

 (ic, peristome of a zooecium; ui, aperture of a zooecium ; gc, peristome of a gonoeeium ; 

 gi. aperture of a gonoeeium ; pp. frontal niicropore seen from the interior. 



BRACEBRIDGIA ACULEATA, new species. 



Plate 71, figs. 10-12. 



Description. 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 furrow and surrounded by an especial line of areolae; the frontal is 



