AHT. 22. CYCLOSTOMATOUS BRYOZOA — GANU AND BASSLEll. 69 



intimate structure of the species. The stem is strengthened front 

 and back by a layer of laminated tissue, which does not appear to 

 have any cancelli." In Pocta's figure the nematopores (cancelli 

 of Gregory) are, on the contrary, quite visible. This species is 

 therefore a Timncatula and not a Homoeosolen. 



Affinities. — This is a small species like Truncatula suhpimiata 

 D'Orbigny, 1854, with which it is perhaps identical. In the figures 

 it differs only in the smaller ovicell and in smaller and more numer- 

 ous nematopores. 



OccuiTence. — Cretaceous (Cenomanian) : Bohemia, Saxony, and 

 England. 



TRUNCATULA DISCOmEA, new species. 



Plate 25, fig. 9-11. 



Our figures represent a unique specimen which might possibly 

 belong to some known arborescent species. Having no specimens 

 showing such a relation, we think that it should be given a new 

 name, although we are not yet convinced that it is more than ai 

 simple zoarial base. 



In spite of external appearances this is not a Swpercytis., for the 

 ovicell is indeed on the dorsal between the branches, as in all the 

 species of the genus Truncatula. T. suhpimuita D'Orbigny, 1854, 

 appears to have tendencies to group its pinnules in a similar po- 

 sition. 



Occui^-ence. — Cretaceous (Santonian) : Vendome (Loir-et-Cher) , 

 France. 



Ilolotype.—C^i. No. 68990, U.S.N.M. 



TRUNCATULA VENDOCINENSIS, new species. 



Plate 26, figs. 12-16. 



Bescriftion. — The zoarium is borne on an expanded circular base. 

 The fronds are large, smooth, rectilinear, bifurcated; the trans- 

 verse section is trapezoidal. The tubes are cylindrical, without 

 peristome, grouped into pinnules, open at the extremity of the pin- 

 nules and on the posterior face. On the posterior face of the zoarium 

 there are numerous nematopores, small, irregular, disposed in quin- 

 cunx in the form of a V. 



Structure. — The sections of this species are identical with those 

 of Truncatula tetragona Michelin, 1846. The meridian section shows 

 cylindrical tubes and an axial tube. The longitudinal section shows 

 a thick layer of nematopores with very thick walls. Finally the 

 transverse section is trapezoidal and shows the posterior zone of 

 nematopores and the anterior zone of polypidian tubes. 



