116 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



Biology. — This species occurs in the same localities as Tremopora 

 radicifera and T. ovalis. It prefers calm, shallow waters and coral, 

 sandy, and shelly bottoms. 

 Occurrence. — 



D. 5137. Jolo Light, Jolo; 6° 04' 25" N.; 120° 58' 30" E.; 20 



fathoms; S. Sh. 

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



fathoms; co. S. 

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

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

 S., Sh. 

 Cotypes.— Cut. Nos. 7914, 7915, U.S.N. M. 



HIANTOPORA SPATHULATA, new species 



Plate 11, fig. 12 



Description. — The zoarium encrusts foraminifera. The zooecia are 

 distinct, separated by a furrow, elongated; the frontal is convex and 

 perforated by a dozen large round pores. The apertura is orbicular, 

 oblique, limited inferiorily by an umbo more or less salient; the 

 peristome is thin and bears 5 distal spines. The ovicell is hypersto- 

 mial, deeply embedded in the distal zooecium, never closed by the 

 operculum, quite globular, verrucose. On each side of the orifice 

 there are two spatulate avicularia with pivot longitudinal and with 

 rounded beak. 



Measurements. — 



~ . n (ho = 0.10 mm. ^ . [L2 = 0.45mm. 



Onncei 7 Zooecia, _ 



Uo = 0.10 mm. [42 = 0.25 mm. 



Biology. — This species is very well characterized by its avicularia. 

 The passage of eggs is assured by the immersion of the ovicell and pro- 

 tection by the operculum in opening. Our specimens were living and 

 in reproduction in March, 1908. 



Occurrence.— D. 5179. Romblon Light, Romblon; 12° 38' 15" N.; 

 122° 12' 30" E.; 37 fathoms; hard S. 



Holotype.—C&t. No. 7916, U.S.N.M. 



HIANTOPORA LATICELLA, new species 



Plate 11, figs. 13, 14 



Description. — The zoarium is unilamellar. The zooecia are little 

 distinct, separated by a very slight furrow, very broad; the frontal is 

 somewhat convex and perforated by 3 to 7 very large orbicular pores; 

 the orifice is semielliptical, transverse; the costules are finely granu- 

 lated. The ovicell is deeply immersed in the distal zooecium; it is 

 smooth, convex, transverse. On each side of the orifice there are two 

 small transverse, triangular, avicularia with two denticles as a pivot. 



Measurements . — 



_._ [7io = 0.17 mm. _ . [Z2 = 0.60 mm. 



0nfice lZo = 0.25 mm. Zooecia j fe = 0>55 mm> 



