788 
BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 
In our very numerous materials we have not been able to discover the transition 
f onns 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 commiseens 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. — Cat. 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, Tervia Jullien, 1882. Prosthenoecia 
Canu, 1918, and Lagonoecia , new genus. 
Genus TERVIA Jullien, 1882. 
1S82. Tervia Jullien, Dragages du Travailleur Bryozoaires especes dragnees dans l’ocean 
Atlantique en 1881, Bulletin Societe Zoologique France, vol. 7, p. 4. 
The ovicell is developed on the posterior and noncell uliferous (dorsal) face 
of the zoarium. 
Genotype. — Tervia ( Tubulipora ) irregularis 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. 
