BRYOZOA OF THE PHILIPPINE REGION 149 



D. 5151. Sirun Island, Sulu Archipelago, Tawi Tawi Group; 



5° 24' 40" N.; 120° 27' 15" E.; 24 fathoms; co. 



S, Sh. 

 D. 5162. Tinagta Island, Tawi Tawi Group; 5° 10' N.; 119° 47' 



30" E.; 230 fathoms; S. brk., Sh. crs.; 11.6° C. 

 D. 5577. Mount Dromedario, Tawi Tawi; 5° 20' 36" N.; 119° 



58' 51" E.; 240 fathoms; crs. S. 

 D. 5579. Sibutu Island, Darvel Bay, Borneo; 4° 54' 15" N.; 



119° 09' 52" E.; 175 fathoms; fine S. co.; 13° C. 

 Geographic distribution. — Torres Strait (Harmer). 

 Plesiotypes.— Cat. Nos. 7950, 7951, U.S.N.M. 



Genus SIPHONOPORELLA Hincks, 1880 



SIPHONOPORELLA OVALIS, new species 



Plate 16, fig. 1 



Description. — The zoarium encrusts nullipores. The zooecia are 

 distinct, separated by a thread, very large, oval, elongated; the mural 

 rim is thick, salient, rounded, with two distal tuberosities; the cryp- 

 tocyst is very small, sunken, flat, smooth. The opesium is very large, 

 oval, occupying the larger part of the zooecium; the polypidian tube 

 is wide, excentric, expanded distally; the opesiular indentations are 

 deep and irregular. 



Measurements. — 



r, • \ho = 0.40 mm. ~ • \Lz = 0.65-0.90 mm. 



0peS1Um iZo = 0.35-0.45 mm. Z ° 0eCla L = 0.60-0.70 mm. 



Affinities. — The initial (serialogene) zooecia of a double series are a 

 little wider. This species differs from the two Australian species 

 Siphonoporella delicatissima Busk, 1861, and Siphonoporella nodosa 

 Hincks, 1880, in its large micrometric dimensions and in the oval form 

 of the zooecia. It differs from the Australian fossil species Siphon- 

 oporella lateralis MacGillivray, 1893, in its very small cryptocyst. 

 It is the sixth known species of this curious genus. The other two 

 species are S. dumonti and S. granulosa Canu and Bassler, 1928, from 

 the Gulf of Mexico. Our specimens were dead. 



Occurrence.— D. 5151. Sirun Island, Tawi Tawi Group; 5° 24' 40" 

 N.; 120° 27' 15" E.; 24 fathoms; co. S., Sh. 



Holotype. —Cat. No. 7949, U.S.N.M. 



2182—29 11 



