BRYOZOA OF THE PHILIPPINE REGION 263 



D. 5574. Simaluc Island, north of Tawi Tawi; 5° 30' 45" N.; 



120° 07' 57" E.; 340 fathoms. 

 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. 

 Cotypes.— Cat. Nos. 8008-8010, U.S.N.M. 



PETRALIELLA FALCIFERA, new species 



Plate 26, figs. 1, 2 



Description. — The zoarium is unilamellar. The zooecia are dis- 

 tinct, elongated, elliptical; the frontal is convex and covered by 

 tremopores; the shield very thin distally and enlarged laterally bears 

 before the aperture a large avicularian umbo with oblique mandible. 

 A large falciform avicularium arranged obliquely is attached to the 

 shield. 



Measurements. — 



. fk =0.16 mm. „ . (Lz~= 1.00 mm. 



Aperture, __ Zooeciai, _ or 



[Za=0.30mm. Us =0.85 mm. 



Affinities. — Two large marginal zooecia have absolutely the aspect 

 and the dimensions of Petraliella philippinensis. We would have 

 considered the rare specimens of P. falcifera as a variety only if we 

 had found them in the same locality. 



Occurrence. — D. 5151. Sirun Island, Sulu Archipelago; 5° 24' 40" 

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



Cotypes.— Cat. No. 8011, U.S.N.M. 



PETRALIELLA VERRUCOSA, new species 



Plate 26, figs. 4-8 



Description. — The zoarium is unilamellar. The zooecia are dis- 

 tinct, separated by a furrow, elongated, elliptical; the frontal is 

 covered with tremopores; the shield is flat laterally and bears before 

 the aperture an avicularian umbo very little salient in which the 

 mandible opens obliquely; 2-6 small elliptical avicularia with pivot 

 appear laterally. The aperture is semielliptical, transverse; the 

 proximal border bears a small lyrula and two small cardelles; the 

 peristome is thin and immersed. Two to four small elliptical avicu- 

 laria with pivots are arranged above the aperture. The ovicell is quite 

 globular, very salient and formed of an olocyst covered by a tremo- 

 cyst with very fine pores. 



Measurements. — 



. . (k=0.16mm. „ . \Lz -0.70-0.80 mm. 



Aperture , on Zooecia, 



Ua =0.20-0.24 mm. U2-=0.50mm. 



