AKT. 14 FOSSIL AND EECEISTT BKYOZOA CANU AND BASSLER 127 



Measurements. — Peristomicei , ^" 



U^ = 0.10 mm. 



„ . 1X3 = 0.50-0.60 mm. 

 Zooecia 7 „ „„ 



Us = 0.30 mm. 



Variations. — Our specimens are generally quite similiar to the fig- 

 ures of Smitt ; we figure two variations — one around a gonoecium the 

 other around the ancestrula. 



Osburn, 1914 (p. 199), identified this species with Adeona violacea 

 Johnston, 1847. He collected all the intermediate forms between the 

 two species at the Tortugas, but on the contrary, our specimens do 

 not have this variability, so that we have not been able to verify 

 Osburn's synonymy. The ancestrula is small and reduced to the 

 peristomie. 



Occurrence. — Fowey Light, 15 miles south of Miami, Fla.; 40 fms. 

 Albatross Station D. 2319, north of Cuba; 23° 10' 



37" N.; 82° 20' 06" W.; 143 fms.; gray coral. 

 Albatross Station D. 2324, north of Cuba; 23° 10' 



25" N.; 82° 20' 24" W.; 33 fms.; coral. 

 Albatross Station D. 2405, Gulf of Mexico; 28° 45' 

 00"N.; 85° 02' 00" W.; 30 fms.; gray sand, broken 

 coral. 

 Albatross Station D. 2639, Straits of Florida; 25° 04' 



50" N.; 80° 15' 10" W.; 56 fms.; coral sand. 

 Florida, 97 meters (Smitt); Bermuda (Verrill). 

 Plesiotypes. —C&t. Nos. 7448, 7449, U.S.N.M. 



Genus BRACEBRIDGIA MacGilUvray, 1886 



BRACEBRIDGIA SUBSULCATA Smitt, 1873 



Plate 23, Figures 1-3; text Figure 25 



1873. Porina subsulcata Smitt, Floridan Bryozoa. Kongl. Svenska Veten- 

 skaps-Akademiens, Handlingar, vol. 11, p. 28, pi. 6, figs. 136-140. 



1900. Porina subsulcata Verrill, 

 Tunicata and Molluscoida of 

 the Bermudas. Trans. Con- 

 necticut Academy, vol. 10, p. 

 54 



1914, Bracebridgia subsulcata Osburn, 

 Bryozoa of the Tortugas Is- 



1 J Ti 1 T x- /-. • Fig. 25.— BRACEBRIDGIA SUBSULCATA SMITT, 



lands. Pubhcation Carnegie ^gyg. ^. operculum, x 85. B. Mandible 

 Institution, Washington, No. with muscles, x 85. C. Mandible, x 85 

 182, p. 199. 



Structure. — It is with hesitation that Osburn, 1914, placed this 

 species in Bracebridgia, for he believed he recognized trace of an 

 ascopore on the frontal. We have prepared several interiors and 

 have observed no traces of the ascopore, as the olocyst is perfectly 

 smooth without any perforation. This species is evidently a 

 Bracebridgia. 



