BRYOZOA OF THE PHILIPPINE REGION 181 



The onychocellarium is an ordinary zooecium perforated by an 

 elliptical, median opesium without a peripheral pad. 



Affinities. — In the regularity of its opesium, this species appears to 

 have the structure of the Membranicellariidae. It can not, however, 

 be classed in the genus Membranicellaria Levinsen, 1909, for the 

 frontal of the zooecia is not rhomboidal and the dorsal is not elliptical. 

 As our specimens had neither ovicells nor chitinous appendages we 

 can not create for them a special genus since we would not be able 

 to define it. 



Erina patagonica Canu, 1908, of the Argentina Helvetian is more of 

 the type of Membranicellaria. Melicerita elliptica Maplestone, 1900, 

 from the Australian Miocene is of absolutely identical structure and 

 presents the same onychocellaria and the same colony. If the 

 enlargement indicated be exact it is a smaller species but positively of 

 the same genus. 8 



Membranipora regularis Maplestone, 1900, belongs prehaps to the 

 same group, but no onychocellaria are shown on the figure. 



Eschara amyntas D'Orbigny, 1852, of the French Senonianhas the 

 same zooecial form but the opesium of the onychocellarium is large, 

 elliptical, and not median. It is very small on Eschara alimena 

 D'Orbigny, 1852. 



Vincularia perforata and Eschara areas D'Orbigny, 1852, of the 

 French Senonian are figured without onychocellaria, but the zooecial 

 form is also hexagonal. 



Eschara echinata D'Orbigny, 1892, of the French Senonian in zooecial 

 form belongs also to the same group. However, the latter on the same 

 colony can be ogival, rhomboidal, or indistinct. Besides the ovicell is 

 hyperstomial and of a type altogether different, for it is never buried 

 on the distal zooecium. The onychocellarium is also a more dif- 

 ferentiated structure. 



Omoiosia maorica is a very remarkable species. It indicates 

 manifestly that the onychocellarium is not an organ particular to one 

 family as Jullien thought in 1881 for it certainly exists in the Mem- 

 branicellariidae. 



Occurrence. — D. 5574. Simaluc Island, north of Tawi Tawi; 5° 30' 

 45" N.; 120° 07' 57" E.; 340 fathoms. 



Plesioty pes. —Cat. No. 7983, U.S.N.M. 



Family COSCINOPLEURIDAE Canu, 1913 



Description of the family and the principal genus Coscinopleura is 

 given in our 1920 monograph. Macropora MacGillivray, 1895, and 

 Quadricellaria D'Orbigny, 1850, which we placed here in 1920, are 



» What the Australian author considered as an avicularium Is a perforation of external origin. 

 2182— 29— — 13 



