EARLY TERTIABY CHEILOSTOME BRYOZOA. 13 



tocyst. It differs from the recent A. armata Haswell, 1880, in the 

 total absence of a lateral avicularium on the distal arch. 

 Occurrence. — Middle Jacksonian : Near Lenuds Ferry, South Caro- 

 lina (common). 

 Wilmington, North Carolina (very rare). 

 Type.— C^t. No. 62570, U.S.N.M. 



Genus TROCHOPORA D'Orbigny, 1851. 



1851. Trochopora D'Orrignv, Paleontologie frangaise, Terrain Cretace, 

 Bryozoaires, vol. 5, p. 506. 



The zoariimi has the Lmiulites form. The zooecia and the vibrac- 

 ula are arranged in distinct rows. The ancestrular zooecia are either 

 hydrostatic or radicular. The growth of the zoarium is effected by 

 superimposed (unizocecial) disks with the zocecia arranged in single 

 rows. No ovicell. The vibracula are symmetrical. 



Genotype. — Trochopora conica Def ranee, 1883. 



Range. — Lutecian-Helvetian. 



Trochopora {Lunulties) houel Lea, 1833, of the Claibornian and 

 Lower Jacksonian of the Southern States and Trochopora {Lunu- 

 lites) truncata De Gregorio, 1890, from the same horizons are two 

 abundant species of this genus in America. 



OTIONELLA, new genus. 



{Otion, a little ear, in allusion to the form of the vibraculum.) 



The zoarium is discoidal (Lunulites form), with neither ovicell 

 nor radicular and hydrostatic zooecia. The vibraculum is inter- 

 zooocial, unsymmetrical, auriculated, one lip more prominent than 

 the other. The zooecia are hexagonal and disposed in quincunx on 

 the outer face and in radial lines on the inner side. The ancestrula is 

 as large as the other zooecia and of the same form. 



Genotype. — Otionella perforata., new species. 



Range. — Campanian-Jacksonian. 



Besides the genotype described below, three other new species of 

 the genus are known in the Claibornian and Jacksonian. 



OTIONELLA PERFORATA, new species. 

 Plate 1, figs. 3, 4. 

 Description. — The zoarium is discoidal with a concave inner face. 

 The zocecia are ogival in shape, broad, distinct, separated by a fur- 

 row, disposed in very irregular radial and transverse lines; the 

 mural rim is broad on the sides and below with a projecting summit; 

 the opesium is elliptical, little elongated, nearly orbicular, bordered 

 by a projecting collar. The vibraculum is as large as the zooecium, 

 unsymmetrical and auriculated, rather narrow. On the inner face 

 the radial ribs are perforated with numerous pores. There are at 



