BRYOZOA OF THE PHILIPPINE REGION 249 



Measurements. — 



rj ■ ! • \Lz = 0.50-0.55 mm. . , |k = 0.10mm. 



Zoanal zooecia Apertures, 



1^2 = 0.30-0.35 mm. Ua = 0.08 mm. 



Female zooecia \Lz = 0.65-0.70 mm. . . (A.a = 0.10 mm. 



(with ovicell)lZz = 0.30-0.35 mm. P res 'lfa = 0.10 mm. 



t i . i • I Z,2 = 0.35 mm. A |k = 0.015 mm. 



Aborted zooecia Aperture, nnic 



U2 = 0.20-0.25 mm. Ua = 0.015 mm. 



~ • , |Lz = 0.15mm. , \ha = 0.01-0.02 mm. 



Zooeciules Aperture, nni _ 



(t2 = 0.12 mm. ^ lm = 0.015 mm. 



Affinities. — Our specimens present almost all the groups of zooecia 

 with very small aperture called by Hincks "aborted" although in 

 reality we are absolutely ignorant of their structure and their physio- 

 logical function. It is likewise with the zooeciules. 



The micrometric measurements given above are somewhat different 

 from those which we have observed on the figures published by tho 

 authors; but this is a very variable species susceptible to the least 

 undulation of the substratum. The ovicells are also shorter and 

 wider; they have a mitriform aspect. We have never observed 

 frontal tuberosities. We are therefore not absolutely certain of our 

 determination. 



All of our specimens were dead; they encrust pebbles and shells. 

 This is the first time that this species has been dredged from depths so 

 great. 



Occurrence. — 



D. 5144. Jolo Light, Jolo; 6° 5' 50" N.; 121° 2' 15" E.; 19 



fathoms; co. S. 

 D. 51G2. Tinagta Island, Tawi Tawi Group; 5° 10' N.; 119° 47' 



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

 D. 5217. Anima Sola Island, between Burias and Luzon; 13° 20' 

 N.; 123° 14' 15" E.; 105 fathoms; crs. gy.S.; 17.2° C. 

 Geological distribution. — Vicksburgian and Miocene of the United 

 State.-; Miocene of Australia. 



Geographical distribution. — Atlantic: English Channel, Madeira, 

 Azores, Cape Verde Islands. Pacific: Loyalty Island, Torres Straits, 

 China Sea, Tizar Bank. Indian Ocean: Saya de Malha, Mauritius, 

 Wasin, British East Africa. 



Ptesiotype.— Cat. No. 7997, U.S.N. M. 



Genus CHORIZOPORA Hincks, 1880 



CHORIZOPORA VENTRICOSA, new species 



Plate 22, fig. 12 



Description. — The zoarium encrusts shells. The zooecia are dis- 

 tinct, separated by a furrow, a little elongated, elliptical, ventricosCi 

 bound together by connecting tubes; the frontal is convex, trans- 



