532 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



1915. Entalophora proboscidea Harmer, The Polyzoa of the Siboga Expedition; 



pt. 1, p. 108, pi. 10, fig. 12 (ovicells). 

 1920. Mecynoecia proboscidea Canu and Bassler, Monograph Early Tertiary 



Bryozoa North America, Bull. 106, U. S. National Museum, p. 726, pi. 



10S, figs. 1-15. 



The base has the Proboscina growth form and not an expanded foot. 

 The ovicell on our specimen is similar to that figured by Harmer in 

 1915 from a Malasian example. 



The peristome measures 0.20 mm. in diameter on the average. 

 Some variations are possible according to the diameter of the branches; 

 on the more robust it can measure 0.24 mm. although this is rare. 

 Biology. — According to former observations made on specimens 

 from the temperate zone this species seemed characteristic of the 

 rather deep bottoms. In the equatorial zone it appears on the con- 

 trary to live at less depth. Harmer, 1915, cites 36 to 73 meters for 

 specimens from Malasia. In the Philippines we have observed it 

 from 34 to 47 meters and its geographic extension is much reduced. 

 In the Sulu Archipelago, very rich in diatoms, the peristomes are little 

 salient but as other species with long peristomies live in this same 

 locality it must be concluded that the great saliency of the tubes has 

 no relationship to the richness of the plankton. 

 Occurrence. — 



D. 5141. Jolo Light, Jolo; 60° 9' N.; 120° 58' E.; 29 fathoms; 



co. S. 

 D. 5147. Sulade Island, Sulu Archipelago; 5° 41' 40" N.; 120° 



47' 10" E.; 21 fathoms; co. S., Sh. (common). 

 D. 5151. Sirun Island, Sulu Archipelago; 5° 24' 40" N.; 120° 

 27' 15" E.; 24 fathoms; co. S., Sh. (common). 

 Plesiotypes — Cat. Nos. 8350-8352, U.S.N.M. 



MECYNOECIA GEMINATA, new species 



Plate 79, figs. 9, 11 



Description. — The zoarium is free, cylindrical, robust, bifurcated 

 borne on an orbicular, little expanded foot. The tubes are visible 

 only because of their convexity; they are striated transversely, 

 isolated, or paired; the peristomie is salient, somewhat oblique or 

 almost perpendicular to the zoarial surface; the peristome is orbicu- 

 lar and very thick. The ovicell is a long, very convex sac terminated 

 by a large crescentic oeciopore. 



Measurements. — Diameter of orifice, 0.10-0.12 mm; diameter of 

 peristome, 0.20; diameter of tubes, 0.24-0.26; distance of apertures, 

 1.00; width of branches, 1.00. 



Affinities. — The paired tubes characterize this species very well. 

 Fascicles of three tubes are very rare. The transverse section indi- 

 cates the club-shaped tubes. 



