102 
BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 
Genus ADENIFERA Canu and Bassler, 1917. 
1917. Adenifera Canu and Basslek, Synopsis of American Early Tertiary Cheilostome 
Bryozoa, Bulletin 96, United States National Museum, p. 12. 
With a distal glandular penthouse. 
Genotype. — M embranipora armata Haswell, 1880. 
Range. — J acksonian-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 Petmlia, 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 emhranipora 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 {M embranipora) armata Haswell, 1880. Recent. 
Adenifera ( M embranipora ) nigrans Hincks, 1882. Recent. 
Adenifera (M embranipora) marginella Hincks, 1884. Recent. 
Adenifera (M embranipora') striata MacGillivrav, 1904. Tertiary of Australia. 
ADENIFERA INARMATA Canu and Bassler, 1917. 
Plate 21, figs. 5-7. 
1917. Adenifera inarmata Canu and Bassler, Synopsis of American Early Tertiary Clieilo- 
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 are 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. 
,, j. r\ • f4o=0.60-0.66 mm. 
Measurements. — Opesia , _ 
1 | to=0.50 mm. 
Zooecia 
fLz= 0.80-0. 90 mm. 
| fe=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. 
Occurrence. — Middle Jacksonian: Near Lenuds Ferry, South Carolina (com- 
mon) ; Wilmington, North Carolina (very rare)/ 
Cotypes j — Cat. No. 62570, U.S.N.M. 
