ART. 14 FOSSIL AND RECENT BRYOZOA CANU AND BASSLER 159 



know the variations of the zoarial form, the ovicell and its deforma- 

 tions, and the protoecium which is almost always destroyed. 



There are no recent species in which all these characters have been 

 carefully studied and figured. Their comparison is therefore quite 

 useless. Here the free peristome attains almost to 0.50 mm. in 

 length; it is very fragile and is broken on dead or dried specimens. 



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

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



Cotypes—C&t. No. 7567, U.S.N.M. 



Family PLAGIOECIIDAE Canu, 1918 



Genus PLAGIOECIA Canu, 1918 



PLAGIOECIA DISPAR, new species 



Plate 31, Figure 10 



Description. — The zoarium is orbicular; it encrusts small dead 

 shells. The tubes are distinct, separated by a furrow or by a thread, 

 cylindrical with a little salient and very oblique peristome. The 

 peristome is thin, orbicular, or oval. The ovicell is very long, quite 

 convex, not marginal. 



Measurements. — Diameter of orifice, 0.05 mm. 



Diameter of peristome, 0.07 mm. 

 Distance of tubes, 0.44 mm. 

 Separation of tubes, 0.30 mm. 



Affinities. — This species is well characterized by the subcentral 

 place of its ovicell, contrary to the general rule. In the length of 

 this ovicell, it approaches Diastopora lactea Calvet, 1903, but differs 

 from it in the absence of concentric wrinkles on the colonies and in 

 the somewhat smaller micrometric measurements. 



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

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



Eolotype.—C&t. No. 7571, U.S.N.M. 



PLAGIOECIA SAfiNIENSIS Norman, 1864 



Plate 34, Figure 10 



1889. Diastopora sarniensis Jelly, A synonymic catalogue of Marine Bryo- 



zoa, p. 85. (Bibliography.) 

 1907. Diastopora sarniensis Calvet, Bryozoaires. Expedition scientifique 



Travaileur et Talisman, p. 415. (Bibliography.) 



Our specimen encrusts a fragment of shell and is ovicelled. This 

 is a cosmopolitan species. 



Occurrence. — Pliocene: Minnitimmi Creek, Bocas Island, Almi- 

 rante Bay, Panama. 



Geographic distribution. — Eastern Atlantic : British Channel. Med- 

 iterranean and Adriatic. Pacific: Queen Charlotte Islands, Austra- 

 lian shores, China Sea. 



Plesiotypes. ~C&t. No. 70852, U.S.N.M. 



