NO. 1 OSBURN: EASTERN PACIFIC BRYOZOA— CHEILOSTOMATA 51 



Genus ANTROPORA Norman, 1903 

 Antropora Norman, 1903 :87. 

 Membrendoecium Canu and Bassler, 1917:17. 

 Dacryonella Canu and Bassler, 1917:28. 

 Antropora, Yidirvatr, 1926:232. 

 Canua Davis, 1934:215. 

 Antropora, Marcus, 1937:50. 

 Antropora, Silen, 1941 :43. 



Norman indicated the heavy cryptocyst, surrounding the aperture; 

 the paired avicularia at the distal ends of the zooecia; the presence of 

 dietellae, and the genotype, Membranipora granulifera Hincks. Harmer's 

 description is more complete, adding the fact that the ovicells are endo- 

 zooecial and vestigial and that the avicularia do not always face each 

 other. How^ever, he refers to the avicularia as "adventitious" which is 

 incorrect since dissection proves them to be interzooecial. 



I am unable to draw any line of distinction between Antropora, Mem- 

 brendoecium and Dacryonella, and Canua is merely a new name for 

 Membrendoecium which was improperly founded and which Canu and 

 Bassler have corrected. In all of these the cryptocyst is heavy, broad 

 proximally and continued, at least narrowly, around the aperture; the 

 ovicell is endozooecial and vestigial ; all have small interzooecial avicu- 

 laria at or near the proximal corners; all are provided with dietellae, and 

 all are heavily calcified. 



Dacryonella has a large cryptocystal lamina, but not larger than it 

 often is in some species that have been allotted to Antropora and Mem- 

 brendoecium, and it has the same form. The avicularia of Antropora are 

 not "adventitious," as stated by Norman and Harmer, since both dissec- 

 tion and the manner of development at the growing edge prove them to 

 be interzooecial in origin. 



Antropora granulifera (Hincks) , the genotype, occasionally has larger 

 interzooecial avicularia, and this is also true of other species, such 

 as A. (Crassimarginatella) tincta (Hastings), A. (Membrendoecium) 

 claustracrassa (Canu and Bassler), A. (Membrendoecium) compressa 

 (Osburn) and A. (Crassimarginatella) leucocypha (Marcus). None of 

 the above species have the hyperstomial ovicell and the type of avicu- 

 larium with a complete hinge bar of Crassimarginatella crassimarginata 

 (Hincks). 



Through the kindness of Dr. R. S. Bassler, who has shown similar 

 courtesies on many occasions, the writer has had the opportunity to make 



