300 
BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 
DISTANSESCHARELLA JACKSONICA, new species. 
Plate 42, fig. 1. 
Only the figured specimen has been found, and it is unfortunately very incom- 
plete. The function of the thick smaller zooecia is unknown. Smitt has cited 
something analogous to them in M cmbraniporella agassizi Smitt. 1873, 1 where they 
are rare. 
The zoarium incrusts an Idmonea. 
Occurrence. — Middle Jacksonian: One-half mile southeast of Georgia Kaolin 
Company Mine, Twiggs County, Georgia (very rare). 
Hoiotype.— Cat. No. 64029,’ U.S.N.M. 
Fig. 85.- — Genus Gephyrotes Norman, 1903. 
A-E. Gephyrotes nitido-punctata Smitt, 1SG8. A. Zooecia, X 19. (After Smitt, 1868.) 
B. Zooecia, showing avicularia (av), ovieell (or), and spiramen ( sp ). C. Var. spitzbergensis 
Norman, 1903. Anterior portion of an ovicelled zooecium. (After Norman, 1903.) D. The 
anterior portion of a zooecium, to show the structure of the bridge and oral opening, a, costula 
bifurcated; b , solid outspread costula; c, spiramen; d, lateral foramen; l, lumen; Jp, lumen pore. 
E. Costular system, X 83. (After Nordgaard. 1903.) cl, loop of the costula; la, lacuna; Ip, 
lumen pore. 
Genus GEPHYROTES Norman, 1903. 
1903. Gephyrotes Norman, Notes on Natural History of East Finmark, Annals and Magazine 
Natural History, ser. 7 ,vol. 12, p. 100. 
The costules are narrow. They are at first largely separated for half of their 
length; they are afterwards curved and join the adjacent costules, thus forming 
a complete arch; this arch is followed bv large lateral lacunae. The two distal 
costules bifurcate to form a spiramen in the zooecial axis. A pair of avicularia 
with mandible pointing upwards is developed on the side walls of the aperture. 
The ovieell is subglobose and imperforated. No dietellae. 
Genotype. — Gephyrotes ( Gribitina ) nitido-punctata Smitt, 1868. 
Range. — Jacksonian-Recent. 
We have classified in this genus all the Costulidae provided with a spiramen. 
But, under these conditions, all the costules are not identical. In their general 
1 1875, Smitt, Floridan Bryozoa, Svenska Vetenskaps-Akademiens Handlingar, vol. 19, p. 11, pt. 5, fig. 106. 
