ART. 14 FOSSIL AND EECElSrT BEYOZOA CANU AND BASSLER 143 



1885, are not altogether exact. We Jbave distinctly recognized the 

 two linear lateral attachments common to Holo'porella but they are 

 little removed from the border. Furthermore, the two lamellae 

 which habitually constitute the operculum glide very easily on one 

 another and it seems to us that the small lateral sinuosities figured 

 by Busk have no other origin than irregular gliding in the 

 preparations. 



The interzooecial avicularia have mandibles more rigid and 

 more easy to prepare. Our mandibles are very close to those 

 of Busk; the central lucida is quite variable in form and in 

 position. 



On the interior face of the free colonies the zooecia are arranged 

 in longitudinal bifurcated rows. 



Biology. — "It is readily recognizable by its grayish-brown color 

 with blackish-brown opercula in the zooecial and avicularian aper- 

 tures against which the calcareous white projecting rostra show it." 

 (Smitt.) Except in the youngest stages, the colony has a dark gray- 

 ish or blackish color against which the white spines stand out in 

 sharp contrast." (Osburn.) 



Our colonies are generally free and tubular. They probably en- 

 crust thin algae. Sometimes encrusting shells and Petralia. More- 

 over, the species has been observed on corals and even on sponges. 

 This species has been observed only in little depths of water. Its 

 geographic distribution is great. 



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

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

 coral. 

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



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

 Tortugas, low water, 24 meters (Osburn) ; Florida, 

 41-56 meters (Smitt). 



GeograpJiic distribution. — Indian Ocean: Heard Island, 121 meters. 

 Pacific: Shark Islands, Port Jackson, 13 meters; and Port Philips 

 Heads, Australia. 



Geologic distribution. — Miocene of Australia (Waters) ; Pliocene of 

 New Zealand (Waters); Oligocene of Anguilla; Miocene of Jamaica; 

 Pliocene of Florida. 



Plesiotypes.— Cat. No. 7527, U.S.N.M. 



HOLOPORELLA MAGNIFICA Osburn, 1914 



Plate 24, Figures 7, 8; text Figure 32 



1914. Holoporella magnifica Osbukn, Bryozoa from the Tortugas Islands. 

 Publication Carnegie Institution, Washington, No. 182, p. 216, figs, 

 22, 23. 



,^ . A ^ /7ia = 0.24-0.26 mm. 



Measurements. — Aperturei, ^ ^^ ^ „^ 



Ua = 0.28-0.30 mm. 



