Measurements.- 



792 BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 



Occurrence. Middle Jacksonian (Castle Hayne limestone) : Wilmington, 

 North Carolina, (rare). 



Cotypes.C&t. No. 65366, U.S.N.M. 



TERVIA PYR1FERA, new species. 

 Plate 146, figs. 9-12. 



Description. -The zoarium is free and formed of bifurcated branches with 

 elliptical transverse section; the dorsal is round and smooth. The fascicles are 

 very salient and border the zoarial margins; they always contain about five tubes. 

 The tubes are little convex, flat, distinct, separated by a slight furrow. The ovicell 

 is large, globular, elongated, pyrifomi, placed at the bifurcation of the branches; 

 the oeciostorne is salient, elliptical, transverse. 



-Distance between the fascicles 0.50 mm. 



Width of the fascicles 0.12 mm. 



Average diameter of the tubes 0.08 mm. 



Diameter of the zoarium 0.75 mm. 



Number of tubes to the fascicle 5. 



Affinities. Like Tervia tumida Smitt, this species belongs to the second group 

 of Tervia, whose aspect is absolutely identical w,ith that of typical Idmonea. It 

 differs from it in its larger ovicell placed at the bifurcation of the branches and 

 ia a lesser interfascicular distance (less than 0.52 mm.). 



This species differs from Tervia globulifera in its pyriform ovicell, its greater 

 interfascicular distance, and in its fascicles bordering the zoarial margins. 



Occurrence. Middle Jacksonian (Castle Hayne limestone) : Wilmington, 

 North Carolina (rare). 



Holotype.Cz.t. No. 65367, U.S.N.M. 



LAGONOECIA, new genus. 



Greek : layon, flank, referring to the position of the ovicell. 

 The ovicell is symmetrical, globular, suspended on one of the sides of the 

 zoarium; the oeciostome is transverse, terminal. 



Genotype. Lagonoecia lamettifera, new species. Lower Jacksonian. 



LAGONOECIA LAMELLIFERA, new species. 

 Plate 112, figs. 1-S. 



Description. The zoarium is an Idmonea, with clavifonn, triangular, and 

 often reticulate branches. The fascicles are formed of five to six tubes; they are 

 arranged transversally and alternately on each side of the median axis; they are 

 very salient and form like very oblique lamellae, imbricated one above another. The 

 tubes are distinct, flat, bordered by a salient thread ; the peristome is thin and 

 quadrangular. The zone of growth is large, salient, and triangular. The posterior 

 face (dorsal) is very finely striated longitudinally. The ovicell is large, very con- 



