84 PROCEEDINGS OF THE KATIONAL MUSEUM. vou 61. 



Genus TEREBELLARIA Lamouroux, 1821. 



1821. TerebeUaria LAMOtmoux, Exposition metliodique des generes de 

 I'order des Polypiers, p. 84. 



The ovicell is long, convex, salient, transverse. The oeciostorae is 

 round, salient, distal, turned toward the base. 



According to Gregory, the zoarial growth is by the addition of 

 Berenicoid colonies on the ends of the branches ; each colony sends an 

 expansion downward around the stem. The zooecia are reflexed. Tne 

 apertures occur in zones separated by interzones of dactylethrae. 



Genotype. — Terehellaria ra/mosksima Lamouroux, 1821. Range, 

 Jurassic, (^retaceous. 



TEREBELLAniA RAMOSISSIMA Lamouroui. 1821. 



Plate 10, figs. 7-10. 



1899. TercheUaria ramosissiiiia Gkegory. Catalogue Fossil BryoKoa in 

 British Museum, Jurassic, p. 188, pi. 10, fig. 5 (cities bibliography). 

 This well known and frequently quoted bryozoan, described in 

 detail by Gregory, has still never been located in a natural classifica- 

 tion. Our discovery of the Plagloecia-hke ovicell now enables its 

 position to be determined. 



Occurrence. — Jurassic of France and England, 

 Flesioty pes. —C'At. No, 82286, U.S.N.M. 



THE CEmAE OF D'ORBIGNY. 



1852. Ceidae d'Okbigny, Paleoutologie franeaiso. Terrain Cr6tac6, vol. 5, 

 p. 1000. — 1889. Pergens, Revision des Bryo/oaires du Cretacg figures 

 par d'Orbigny, Bulletin Society beige de geologic, vol. 3, p; 310, flg. 

 23. — 1899. Canu, Les ovicelles des C6idees, Bulletin de la Soci6te 

 gfiologique du France, ser. 3, vol. 27, p. 326. — 1907. Filliozat, Bryo- 

 zoaires or^tac6s de Vendomcv Bulletin de la Soci6t6 geologique de 

 France, ser. 4, vol. 7, p. 397. 

 Structure. — D'Orbigny characterized this family a^ follows: "Cell- 

 ules centrifuginee [Cyclostomes], foraminees [without peristome! 

 dont I'ouverture est evasee exterieurement," 



We have prepared quite a number of sections in an endeavor to 

 determine the structure of these fossils and have noted, first, that 

 the tubes are conical, without peristome, oriented, with triparietal 

 gemmation; second, the extremity of the tubes has dilated walls; 

 third, a small oral tongue gives to the orifice its funnel-shaped form. 

 This form of the tube, club-shaped and without peristome, is not 

 peculiar to the Cretaceous formations, as we possess Tertiary forms, 

 and even recent ones not yet described, which have this structure. 

 According to Pergens, Oinctipora elegans Hutton is a living repre- 

 sentative ; but this species has not yet been studied in detail. 



The mode of gemmation is analogous to that of all the species with 

 oriented zooecia. We have observed some interesting peculiarities. 



