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



The tubes are larger and club shaped. The latter character is clearly 

 visible in transverse sections which show a large number of tubes 

 increasing regularly from the center to the circumference. 



We have observed only the free forms of growth, but encrusting 

 forms are quite possible. 



The oeciostome always measures 0.10 mm. and the oeciopore 0.06 

 mm. No exceptions to this have been found. The genotype Bidiasto- 

 fora neocomiensis D'Orbigny, 1852 (pi. 4, fig. 3), from the Lower 

 Cretaceous (Valangian) of Switzerland will be described in our 

 next paper, 



NEMATIFERA, new genus. 



The ovicell is an elongated sack, subsymmetrical, irregular, 

 scarcely convex; the oeciostome is terminal, very small, hardly 

 salient. All of the tubes are bordered with salient threads exte- 

 riorl}^ The tubes are short, cylindrical, polygonal; the gemmation 

 is triparietal on a basal lamella. 



Genotype. — Nematifera (Elea) reficulata^''Orhignj,185Z. Lower 

 Cretaceous (Neocomian, Urgonian). 



The ovicells so far discovered are little distinct, but clearly dif- 

 ferent from those of Triffonoecia, although the structure in sections 

 in these two genera is very similar. The tubes are bordered exte- 

 riorly by a salient thread, which never occurs in Trigonoecia. 



According to the exterior resemblances, this genus ought to have 

 Jurassic representatives. The genotype (pi. 4, fig. 6) is described 

 in detail in our paper on the Lower Cretaceous faunas of Switzer- 

 land now in preparation. 



ENTALOPHOKA (NEMATIFERA?) ROEMERI Levinscn, 1912. 



Plate 13, figs. 11-13. 



1840. Meliceritites gracilis Roemer, Die Versteinerungen des norddeutschen 



Kreidegebirges, p. IS, pi. 5, flg. 13. 

 1912. Entalophora roemeri Levinsen, Studies on the Cyclostomata oper- 

 culata, Memoires de 1' Academie R. des Science et des Lettres de 

 Danemark, ser. 7, vol. 10. p. 29, pi. 7, figs. 25, 26. 

 Levinsen's original description is as follows : 



The hexagonal zooecia, which are only half as long as broad, are 

 provided with a very concave frontal area and divided by strongly 

 developed marginal ridges. The aperture which takes up the 

 larger part of the breadth in the distal part of the zooecium, and 

 together with the peristome about half the length of the whole zooe- 

 cium, is triangularly rounded, broader than high, and provided with 

 a strongly developed peristomial thickening, the proximal part oi 

 which forms an obliquely or even vertically ascending under lip. 

 The fragments examined are elongated clavate, rounded or a little 



