788 BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 



In our very numerous materials we have not been able to discover the transition 

 forms necessary for the union of the two species. Moreover, the branches with 

 distinct fascicles are very rare; the branch represented in figure 2 is the usual 

 occurrence. 



The size of the firmatopores is visible on the tangential section, where they 

 appear under the form of short, rather wide spindles. 



This species much resembles Idmonea commiscens Lonsdale, 1845. It differs 

 from it absolutely only in its dorsal, which is never flat, contrary to what the 

 author thought (p. 525). It is possible that Lonsdale was considering two species 

 among his specimens. 



Occurrence. Middle Jacksonian : Wilmington, North Carolina (very com- 

 mon) ; near Lenuds Ferry, South Carolina (very common) ; Eutaw Springs, South 

 Carolina (rare). 



Cotypes.CvJt. No. 65358, U.S.N.M. 



TERVIIDAE, new family. 



The longitudinal axis of the ovicell is parallel to that of the tubes. The 

 ovicell is formed after the calcification of the neighboring tubes. The oeciostome 

 is directed toward the top. 



We recognize three genera in this family. Ttn'/a Jullien, 1882. Prostkenoecia 

 Canu, 1918, and Lagonoecia, new genus. 



Genus TERVIA Jullien, 1882. 



1882. Tervia JULLIEN, Dragages du Tmvuilleur Bryozoaires especes dragnfies dans I'oc&in 

 Atlantique en 1881, Bulletin Societe Zoologique France, vol. 7, p. 4. 



The ovicell is developed on the posterior and noncelluliferous (dorsal) face 

 of the zoarium. 



Genotype. Tervia, (TiibuUpora) irregular!* Meneghini, 1845. 



Range. Lutetian-Recent. 



The genus Tervia is characterized not only by its ovicell, but also by the aspect 

 of its dorsal, for the tubes here are flat and separated by a salient thread. Moreover, 

 on the frontal the fascicles are never parallel to each other as in Idmonea. 



TERVIA GRACILIS, new species. 



Plate 147, figs. 1-11. 



Description. The zoarium is free, bifurcated, slender, compressed. The tubes 

 are distinct, separated by a salient thread, arranged in nonparallel fascicles; the 

 peristome is thin, elliptical. The ovicell is very long and curves around almost all 

 the dorsal. The dorsal is convex; the tubes are flat and separated by a salient 

 thread. 



