Maryland Gkological Survey 123 



MOLLUSCOIDEA 



Class BRYOZOA 



Order CTENOSTOMATA 



Family RHOPALONARIIDAE 



Genus RHOPALONARIA Ulrich 



Ehopalonaria tenuis Uh'ich and Bassler 

 Plate VII, Figs. 7-9 



Rhopalonaria tenuis Ulricb and Bassler, 1904, Smith. Misc. Collections, vol. 

 xlv, No. 1452, p. 270, pi. Ixvi, figs. 7-9. 



Description. — Zoariuni adnate, excavating the surface of the host so as 

 to become usually about half imbedrled in it and consisting of attenuate 

 fusiform cells averaging about 3 in 2.0 mm. 



The geographical range of this species which has hitherto been recorded 

 from tlie Hamilton of Michigan, Ontario and New York is now extended 

 to Maryland by the discovery of a specimen in the Romney shales at Wolfe 

 Mill. This specimen consists of rather poorly preserved excavated molds 

 in the surface of a shell but the excavations are distinct enough for the 

 recognition of the species. 



Occurrence. — Eomney Formation, Hamilton Member. East bank 

 Evitts Creek below Wolfe Mill. 



Collection. — Maryland Geological Survey; U. S. Js'ational ^luseum. 



Order TREPOSTOMATA 



Family MONTICULIPORIDAE 



Genus MONTICULIPORA d'Orbigny 

 MONTICULIPORA ( ?) MARYLANDENSIS n. Sp. 



Plate VII. Figs. 10-12 



Description. — Zoarium a lamellate expansion varying from 2 to 6 or 

 more millimeters in thickness and made up of a numl^er of superimposed 

 layers. Zooecia angular, poh'gpnal, thin-walled, about 5 in 2 nmt. Acan- 



