ART. 22. CYCLOSTOMATOUS BRYOZOA CANU AND BASSLER. 61 



Affinities.— Without the ovicell this species can be confounded 

 with Idmonea, because there is no exterior mark of difference. The 

 dorsal is smooth because the nematopores are closed by a thin cal- 

 careous pellicle, longitudinally striated. The zone of growth is coni- 

 cal and shows the orifices all around the zoarium. It reveals also 

 exteriorly the presence of nematopores. This character does not 

 exist in Idiiionea. 



The alternate arrangement of the fascicles distinguishes this species 

 from Diflodesmofora oj^posita. 



Occurrence. — Cretaceous (Maastrichtian) : Maastricht, Holland. 



Cotypes.—CsLiiu collection and Cat. No. 68984, U.S.N.M. 



Genus HOMOEOSOLEN Lonsdale, 1850. 



1850. Homoeosolen Lonsdale, in Dixou's Geology and Fossils of the Ter- 

 tiary and Cretaceous formations of Sussex, p. 307. 



The ovicell is frontal, elliptical, elongated, more or less globular. 

 The tubes are long, widened (club-shaped) oriented with dorsal gem- 

 mation, with terminal walls a little thickened, without peristome, 

 with oblique orifice, grouped in branches with pinnules. The peris- 

 tomes are distributed on the trunk of the branches and on the pin- 

 nules. The dorsal is smooth ; it is turned to the exterior of the bushy 

 zoaria. No adventitious tubes. 



Genotype. — Homoeosolen ramulosus Lonsdale, 1850. 



Stinicture. — The very simple and monomorphic structure of this 

 genus was discovered by Gregory. Unfortunately he has classified 

 in it some species much more complicated. 



Apnities.—This genus differs from Truncatula Hagenow, 1851, in 

 the absence of dorsal nematopores. It differs from Semicytis D'Or- 

 bigny, 1854, in the absence of frontal mesopores. 



HOMOEOSOLEN RAMULOSUS Lonsdale, 1850. 



Plate 24, figs. 8-14. 



1909. Homoeosolen ramulosus Gregory, Catalogue Fossil Bryozoa in British 

 Museum, Cretaceous, p. 76, figa 26, 27, pi. 3, fig. 7; pi. 4, fig. 2. (Bibli- 

 ography, Geologic Distribution.) 



1900. Trvncatula aculeata Canu, Contributions a la Geologie de Romo- 

 rantin. Bulletin Societe Geologique de France, ser. 3, vol. 28, p. 193. 



Structure. — Gregory's longitudinal section made at the extremity 

 of a branch does not sufficiently indicate the true nature of the tubes. 

 Ours is more complete. The tubes are widened, long and their ter- 

 minal walls are a little thickened. The dorsal wall is very thick so 

 that the mode of gemmation does not appear clearly and the dorsal 

 appearance is perhaps only the result of the orientation of the tubes 

 turned in a single direction. 



