62 PROCEEDINGS OF THE NATIONAL, MUSEUM, vol.61. 



The tubular orifices have no veiy special form; they are directed 

 obliquely toward the top. They are distributed at the same time, 

 on the zoarial trunk and pinnules ; the latter are very irregular never 

 symmetrically arranged and are transformed into true branches in 

 most cases. 



Affinities. — This species differs from Uomoeosolen gamhlei Greg- 

 ory, 1909, in the absence of pinnules symmetrically arranged and in 

 its ovicell more globular and not occupying the entire width of the 

 zoarium. 



The base is discoidal ; it is attached to algae or on other bryozoa. 

 The zoarium is somewhat bushy. On our specimens the cellular face 

 is on the interior and the smooth face is at the exterior of the zoarium, 

 contrary to that shown on Gregory's figures. The disk is partially 

 or entirely covered with pores. 



The noncellular or inferior face is not a basal lamella formed by 

 the dorsal of the newly budding tubes. It appears to be formed in 

 the same manner as the Frondiporidae by the dorsal of interior tubes 

 budding anteriorly. But this observation requires further exami- 

 nation. 



Occurrence. — Cretaceous (Turonian) : Riou (Indre-et-Loire), 

 France. 



Cretaceous (Santonian) : Romorantin (Loir-et-Cher), France. 



Cretaceous (Campanian) La Bonneville (Seine-et-Oise), France. 



Plesiotypes. — Canu collection and Cat. No. 68985, U. S.N.M. 



HOMOEOSOLEN GAMBLEI Gregory, 1909. 



Plate 24, figs. 1-7. 



1909. .Homoeosolcn gamhlei Gregoky, Catalogue Fossil Bryozoa in British 

 Museum, Cretaceous, p. 84, fig. 2S. (Bibliography. Geological dis- 

 tribution). 



1854. Truncatula carinata d'Okbigny, Pal^ontologie frangai.se, Terrain Cr6- 

 tac§, vol. 5, p. 1058, pi. 797, figs. 11-15 (not figs. 5-10). 



1897. Truncatula aculeata Canu, Bryozoaires du Turonian de St Calais, 

 Bulletin Soci6te G6ologique de France, ser. 3, vol. 25, p. 748. 



1903. Truncatula tetragona Canu, Note sur la Constance de la Craie de- 

 Villedieu, Bulletin Societe G6ologique de France, ser. 4, vol. 3, p. 268. 



Structure. — The ovicell is placed on the anterior face but always 

 in an excentric manner ; its large axis is never parallel to the zoarial 

 axis. It is elliptical, convex, margined, smooth or wrinkled, and 

 often surmounted by a peristome larger than the others. 



The longitudinal section is identical with that of Homoeosolen 

 ramulosus. There is only one kind of tube; they are widened and 

 their upper walls are little thickened. They have no peristome and 

 open obliquely. The entire cellular face and the pinnules are cov- 

 ered by the orifices of the polypidian tubes. There are no accessory 

 or adventitious pores. 



