NORTH AMERICAN LATER TERTIARY AND QUATERNARY BRYOZOA. 15 



SYSTEMATIC DESCRIPTIONS. 



Class BRYOZOA Ehrenberg. 



Order CTENOSTOMATA Busk. 

 Family TEREBRIPORIDAE Busk, 1839. 



Genus TEREBRIPORA D'Orbigny, 1839. 



vFor description see Bulletin 106, United States National Museum, p. 842.) 



TEREBRIPORA PARVICELLA, new species. 



Plate 27, figs. 1.5, 16. 



Description. — The canalicules are very thin and branch almost at a right angle. 

 The zooecia are very small, arranged somewhat obliquely on the canalicules. 



Occurrence. — Miocene (Yorktown formation): Yorktown, Virginia (rare). 

 Miocene (Duplin marl) : Natural Wells, 2 miles southwest of Magnolia, North Caro- 

 lina (rare). 



Holotype.— Cat. No. 68389, U.S.N.M. 



TEREBRIPORA SINEFILUM, new species. 



Plate 3, figs. 14, is. 



Description. — The canalicules are very thin; they branch obliquely and dis- 

 appear on the adult zooecia. The young zooecia are small and united among them- 

 selves; the old zooecia are large and not united. 



Structure. — Our specimens show no zooecia intact and the perforations alone 

 are visible. The cavity containing the cellule alone persists. It is quite remark- 

 able that the canalicules disappear when the cavities are deep. These two sorts of 

 perforations are moreover visible on the same zoarium. 



Occurence. — Miocene (Bowden marl) ; Bowden Jamaica (rare). 



Cotypes.—C&t. No. 68390, U.S.N.M. 



TEREBRIPORA ELONGATA, new species. 



Plate 3, figs. 16, 17. 



We know this species only from the perforations left in shells and are therefore 

 not able to give a complete description. The canalicules branch almost at a right 

 angle. The distance between the zooecia is equal to their length. The zooecia 

 are much larger than those of Terehripora falunica Fischer, 1866, which is found 

 in Europe at the corresponding geological horizon. 



Occurence. — ^Miocene (Bowden marl): Bowden, Jamaica (rare). 



Holotype.— Cut. No. 68391, U.S.N.M. 



TEREBRIPORA PACIFICA, new species. 



Plate 46, fig. 13. 



This species is known only from the perforations left by it, but these are so 

 distinct that it can easily be recognized. The zooecia appear small, pyiiform 

 approacliing each other from one to two times their length. The ternary a.\es are 



