432 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



Measurements . — 



, [7ia = 0.15 mm. r, „ • \Lz = 0.50 mm. 



Aperturaj, „ 10 Zooecia 



(m = 0.12 mm. [42 = 0.40 mm. 



Length of interzooecial avicularium = 0.45-0.50 mm. 



Variations. — Our specimens are unilamellar and of small dimensions. 

 The marginal zooecia are buried and much longer (0.75 mm.) than the 

 others. The orifice of the avicularia is small and traversed by a pivot. 

 The ovicell is large, very convex; its area is perforated by large pores 

 spaced along the periphery; it is never closed by the operculum. 



This is certainly not the species of Audouin, 1826. Since 18S7 

 MacGillivray has noted a fundamental difference regarding the 

 avicularia. 



Our specimens were dead. The species appear to have a large 

 geographic distribution. It is rare in the Philippines. 



Occurrence.— D. 5478. Tacbuc Point, Leyte; 10° 46' 24" N.; 

 125° 16' 30" E.;57 fathoms; Sh. 



Geographic distribution. — Pacific: Port Phillip, Australia (Mac- 

 Gillivray), Carnley Harbor, Auckland Island, 45 fathoms (Marcus); 

 Indian Ocean: Suez, Red Sea (Waters). 



Plesiotype.—C&t. No. 8255, U.S.N.M. 



COSTAZIA RADIATA Ortmann, 1890 



Plate 63, figs. 8, 9 



1890. Cellepora radiata Ortmann, Die japonische Bryozoen Fauna, Archiv fur 

 Naturgeschichte, vol. 50, p. 56, pi. 1, fig. 14. 



Measurements. — Apertura , ~ * mm ' 



Ua = 0.12 mm. 



Acuities. — The measurements of the apertures are rather variable, 

 for the aperture is sometimes a little transverse. 



This species differs from Costazia costazii Savigny-Audouin, 1826, 

 in its longer and thinner peristomial avicularia. It differs from 

 Costazia spathulata MacGillivray, 1887, in its nonspathulated zoarial 

 avicularia. 



The zoarium forms small convexities attached to shells; it is some- 

 times globular and free. Our specimens from the Philippines are 

 identical with those of the Sea of Japan. They are always very rare. 

 They were dead in the dredging. 

 Occurrence. — 



D. 4807. Cape Tsiuka, Sea of Japan; 41° 36' 12" N.; 140° 36' E. 

 D. 5141. Jolo Light, Jolo; 6° 09' N.; 120° 58' E.; 29 fathoms; 



co. S. 

 D. 5145. Jolo Light, Jolo; 6° 04' 30" N.; 120° 59' 30" E.; 23 



fathoms; co. S., Sh. 

 Shado Isles and Sagami Bay, Japan Sea (Ortmann). 

 Pie siotype.— Oat. Nos. 8256, 8257, U.S.N.M. 



