114 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



TREMOPORA INTERMEDIA Kirkpatrick, 1890 



Plate 11, fig. 1 



1889. Tremopora dendracantha Ortmann, Japan Bryozoen Fauna, Archiv fur 



Naturgeschichte, vol. 50, p. 29, pi. 2, fig. 6. (After Harmer.) 



1890. Membranipora radicifera var. intermedia Kirkpatrick, Torres Straits, 



Sci. Proc. Royal Dublin Soc. (n. s.), vol. 6, pp. 612, 615, pi. 16, fig. 2. 

 1926. Hiantopora intermedia Harmer, Polyzoa Siboga Expedition, p. 237, pi. 

 34, figs. 1-3, text fig. 2 (Bibliography). 



In this species the lateral spines assume a great development and 

 ramify many times in covering over a portion of the opesium. The 

 other characters are identical with those of Tremopora radicifera. 

 The fossils and the incomplete specimens are difficult to differentiate. 



Tremopora dendracantha Ortmann 1890, as well as the Japanese spec- 

 imen figured by Harmer appears to us to be a different species. 



Occurrence. — D. 5580. Sibuta Island, Darvel Bay, Borneo; 4° 52' 

 45" N.; 119° 6' 45" E.; 162 fathoms; 13.2° C. 



Plesiotype.— Cat. No. 8464, U.S.N.M. 



TREMOPORA OVALIS, new species 



Plate 11, figs. 7, 8 



Description. — The zoarium encrusts shells and nullipores. The 

 zooecia are distinct, united by their mural rim, somewhat elongated, 

 oval; the mural rim is thin, very salient in its distal portion where it 

 bears two large spines; two elliptical avicularia, symmetrically ar- 

 ranged, appear on the superior half of the mural rim. The opesium 

 is entire and oval. From the inferior portion of each avicularium a 

 large ramified spine proceeds, arranged perpendicularly to the zooecial 

 plane. 



Measurements. — 



~ . fk = 0.35mm. „ . [l2 = 0.55mm. 



Opesium, Zooecia, 



1^0 = 0.25 mm. [Iz = 0.45 mm. 



Affinities. — This new species differs from Membranipora bellis 

 Maplestone, 1900, in its oval and nonelliptical opesium. It differs 

 from Membranipora intermedia Kirkpatrick, 1890, in its oval opesium 

 and in the constant presence of two avicularia on the mural rim. It 

 differs from Membranipora cervicornis Busk, 1852, also ornamented 

 with large ramified spines in the presence of two oral avicularia placed 

 on the mural rim. 

 Occurrence. — 



D. 5144. Jolo Light, Jolo; 6° 05' 50" N.; 121° 02' 15" E.; 19 



fathoms; co. S. 

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



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

 D. 5151. Sirun Island, Tawi Tawi Group; 5° 24' 40" N.; 120° 27 

 15" E.; 24 fathoms; co. S., Sh. 

 Cotypes.— Cat. No. 7912, U.S.N.M. 



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