102 BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 



Genus ADENIFERA Canu and Bassler, 1917. 



1917. Adenifera CANU and BASSLER, Synopsis of American Early Tertiary Cheilostome 

 Bryozoa, Bulletin 96, United States National Museum, p. 12. 



With a distal glandular penthouse. 



Genotype. Membranipora armata Haswell, 1880. 



Range. Jacksonian-Recent. 



In 1914 Waters studied the genotype and wrote: "This form can not remain 

 under M ' embranipora, though I am not suggesting that it is Petralia, but call atten- 

 tion to various similar characters in forms placed far asunder." 



The hydrostatic zoarial system well known in the Petraliidae is not limited to 

 this family, but occurs frequently in many other bryozoa. We have noted the fact 

 that the life of bryozoa commensal upon algae is in intimate relation with the 

 substratum. 



Waters noted 30 tentacles in M 'embranipora armata, but this number occurs 

 very rarely. We are in ignorance regarding the family to which this genus should 

 be referred. 



The species which may be classed in this genus are as follows : 



Adenifera (Membranipora) armata Haswell, 1880. Recent. 



Adenifera (Membranipora) nigrans Hincks, 1882. Recent. 



Adenifera (Membranipora) margineHa Hincks. 1884. Recent. 



Adenifera (Membranipora} striata MacGillivray, 1904. Tertiary of Australia. 



ADENIFERA INARMATA Canu and Bassler, 1917. 



Plate 21, figs. 5-7. 



1917. Adenifera inarmata CANU and BASSLEK, Synopsis of American Early Tertiary Cheilo- 

 stome Bryozoa, Bulletin 96, United States National Museum, p. 12, pi. 1, fig. 2. 



Description. The zoarium is unilamellar. living upon algae; its lower side 

 bears hydrostatic tuberosities. The zooecia arc very large, ogival in form, and dis- 

 tinct ; the mural rim is very finely, granulated, rounded, enlarged at the base, where 

 it sometimes bears callosities. The opesium is entire, elliptical but somewhat irregu- 

 lar. On the distal part of the mural rim there is an arched pad which is hollow, 

 fragile, and symmetrical, the fore part containing two glands. No avicularia. 



. \ho= 0.60-0.66 mm. . (Zs=0.80-0.90mm. 



Measurements. Opesia 7 n Kf . Zooecia 7 - on -,. 



|io=0.50mm. 1/3=0.60-0.70 mm. 



Affinities. This species differs from Adenifera striata MacGillivray, 1904. 

 from the Miocene of Australia, in its much smaller micrometric measurements and 

 in the reduction of its cryptocyst. It differs from the recent Adenifera armata in 

 the total absence of a lateral avicularium on the distal arch. Here, again, it may 

 be noted that the Membranipores have not always the simplicity of structure 

 described by the older authors. 



Occit>rrence. Middle Jacksonian : Near Lenuds Ferry, South Carolina (com- 

 mon) ; Wilmington, North Carolina (very rare 1 ). 



Cotypes. Cat. No. 62570, U.S.N.M. 



