BItYOZOA OF THE PHILIPPINE REGION 545 



IDMONEA PAUPER, new species 



Plate 84, figs. 13, 14 



Description. — The zoarium is free, compressed, bifurcated; the 

 branches are short, rectilinear, very divergent. The fascicles alter- 

 nate on each side of the median crest and are oblique and salient; 

 they are formed of two tubes, convex and little distinct, reaching the 

 zoarial margin without passing beyond it. The ovicell is small, very 

 globular, arranged between three fascicles onl}^; the oeciostome is 

 large, oblique, adjacent to the first peristome of a fascicle. The 

 dorsal is slightly striated transversely. 



Measurements. — Diameter of peristomes, 0.08-0.10 mm.; distance 

 of fascicles, 0.30-0.40; diameter of branches, 0.50; number of tubes to 

 fascicle, 2. 



Affinities. — This species is very well characterized by the great 

 divergence of the branches and by the poverty in number of tubes to 

 the fascicles. It appears to be a deep water species. 



Occurrence. — 



D. 5217. Anima Sola Island, between Burias and Luzon; 13° 20' 



N.J 123° 14' 15" E.; 105 fathoms; crs. gy. S. 

 D. 5577. Mount Dromedario, north of Tawi Tawi; 5° 20' 36" 

 N.; 119° 58' 51" E.; 240 fathoms; crs. S.; 12.4° C. 



Cotypes — Cat. No. 8397, U.S.N.M. 



IDMONEA CRASSIMARGO, new species 



Plate 85, figs. 2, 3 



Description. — The zoarium is free, bifurcated, thick, supported by a 

 little expanded base The fascicles are arranged alternately on each 

 side of the median crest; they are formed of three distinct tubes, 

 separated by a salient thread; the peristomes are thin and polygonal. 

 The fascicles are short and the branches are surrounded by a thick 

 margin without tubes. The dorsal is large, very convex, striated 

 transversely. 



Measurements. — Width of peristomes, 0.12 mm.; separation of fas- 

 cicles, 0.40 ; diameter of first zooecium, 0.18; number of tubes to fascicle, 

 3; and zoarial width, 0.70. 



Affinities. — In its zoarial margin, this species resemble very much 

 Idmonea tumida Smitt, 1871, from Spitzberg, but differs from it in its 

 larger micrometric measurements. Only the figured specimen has 

 been found. We have photographed it because of its great affinity 

 with a boreal species and its very distinctive characters. 



Occurrence. — D. 5579. Sibutu Island, Darvel Bay, Borneo; 4° 54' 

 15" N.; 119° 09' 52" E.; 175 fathoms; fine S. Co., 13° C. 



Ilolotype.—C&t. No. 8398, U.S.N.M. 



