842 



BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 



Family TEREBRIPOR1DAE D'Orbigny, 1839. 



Bibliography. 1839. D'ORBIGNY. Voyage dans 1'Amerique Meridionale, vol. 5, pt. 4, Zoophytes, 

 p. 22, pi. 10, figs. 16-19. 1866. FISCHER, Etude sur les Bryozoaires perforants de la fainille 

 des Terebriporides, Nouvelles Archives du Museum d'Histoire Naturelle, vol. 2, pp. 293-313. 

 18SO. JULLIEN, Description d'une nouvelle espece de Bryozoaire perfornut du genre Tercbri- 

 pora D'Orbigny, Bulletin Soeiete Zoologique de France, vol. 5, p. 5. 



Broyozoa perforating very superficially the enamel of shells. The zoarium is 

 a more or less complicated network of small canals in which the zooecia are inserted. 



The latter bear an aperture provided with 

 a rimule. 



The Terebriporidae are not rare on the 

 present seacoasts; nevertheless they have 

 never been the object of anatomical research. 

 Jullien thought that they might belong to 

 the Hydroids. Their place in the Ctenos- 

 tomata is doubtful. 



There are only two known genera, 

 Sp.athipora Fischer, 1866, and Terebripora 

 D'Orbigny, 1839, differing from each other 

 in the method of branching of the small 

 canals. 



B 



FIG. 27ti. Genus Terebripora D'Orbigny, 



1839. 



A, B. Terebripora ramosa D'Orbigny, 

 1839. A. Zoarium enlarged ; primitive 

 axis longitudinal, secondary axis trans- 

 verse; many small anastomising canals 

 between the axes of different orders are 

 seen. B. Zooecium much enlarged. The 

 small canals leave the sides of the zooe- 

 cium toward its middle. (After Fisher, 

 1866.) 



Genus TEREBRIPORA D'Orbigny, 1839. 



1839. Terebripora D'ORBIGNY, Voyage clans 

 1'Amerique Meridionale, vol. 5, pt. 4, 

 Zoophytes, p. 22. 



The zooecia are arranged on the axes of minute canals, which in branching 

 emerge from the primary axis at the point of attachment of a zooecium. 

 Genotype. Terebriporn ramosa D'Orbigny, 1839. 

 Range. Jurassic-Recent. 



TEREBRIPORA, species undetermined. 



Plate 112, fig. 13. 



Of this species we have found only a fragment, which is a rather vague imprint 

 not meriting a detailed description. The zooecia are very elongate; their dorsal, 

 which is as usual very thin, is sometimes broken. The zoarium is very incomplete, 

 but the arrangement of the ramifications leaves no doubt as to the generic determina- 

 tion. It is useless to give a name to such a poor fragment, and the present notice is 

 simply to indicate the presence of the genus in the Midwayan and to call the atten- 

 tion of collectors to it. 



Occurrence. -Midway (Porters Creek formation") : Three miles north of 

 Scooba, Kemper County, Mississippi (very rare).. 



