1^ BtrLLETIN 96, UNlTEt) STATES NATIONAL MUSEUM. 



This interesting species is named after Dr. Marcus Benjamin, 

 editor of the United States National Museum. 



Occurrence. — Upper Jacksonian: Rich Hill, 5^ miles southeast 

 of Knoxville, Crawford County, Georgia (very rare). 



Type.— C^i. No. 62596, U.S.N.M. 



ODONTIONELLA, new genus. 



{Odontion, denticle.) 



No intertentacular organ. No dietellae. With denticular plate in 

 the opesia. Septulae fairly numerous. Zoarium may be unilaminate 

 or bilaminate in the same species. (After Waters.) 



Genotype. — Memhranipora Mans Hincks, 1885. Range, — Lutecian- 

 Recent. 



We have instituted this genus for the Mans group (No. 13) of 

 Waters which this author thought in 1898 should be removed from 

 Memhranipora. 



Odontionella {Memhranipora) savartil Audouin, 1826, the widely 

 distributed Tertiary and recent form occurs in the Upper Jacksonian 

 and Vicksburgian of Mississippi and Alabama. 



ADENIFERA, new genus. 



{Aden^ gland.) 



With a distal glandular penthouse. 



Genotype. — Memhranipora armata Hasw^ell, 1880. Range. — Jack- 

 sonian-Recent. 



ADENIFERA INARMATA, new species. 

 Plate 1, fig. 2. 



Description. — The zoarium is unilamellar, living upon algae; its 

 lower side bears hydrostatic tuberosities. The zoopcia are very large, 

 ogival in form, and distinct; the mural rim is very finely granulated, 

 rounded, enlarged at the base where it sometimes bears callosities. 

 The opesium is entire, elliptical but somewhat irregular. On the 

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

 fragile, and symmetrical, the forepart containing two glands. No 

 avicularia. 



,, , r^ . (^0=0.60-0.66 mm. 



Measurements. — Opesia , „ ^^ 



^ [Z<9=0.50mm. 



„ . fZ3=0.80-0.90 mm. 

 ^^«^"^M?^=0.60-0.70mm. 

 Affinities. — This species differs from Adenifera (MemTnmnipora) 

 striata MacGillivary, 1904, from the Miocene of Australia, in its much 

 smaller micrometric measurements and in the reduction of its cryp- 



