12 PROCEEDINGS OF THE NATIONAL. MUSEUM vol. 6T 



Measurements. — Diameter of orifice, 0.12-0.13 mm.; diameter of 

 peristome, 0.17 mm.; diameter of tubes, 0.24-0.30 mm.; distance of 

 peristomes, 0.60-0.70 mm.; separation of peristomes, 0.80 mm. 



Affinities. — This species is very well characterized not only by its 

 concave tubes but also by its frontal ornamentation and especially 

 by its small salient threads arranged in quincunx. 



Occurence. — -Lower Cretaceous (Aptian) : Faringdon, England (very 

 rare) . 



Holoty pe.—C&t. No. 69S48, U.S.N.M. 



BERENICEA (REPTOMULTISPARSA) TENELLA De Lorlol, 1868 



Plate 29, figs. 1, 2 



1868. Reptomultisparsa tenella De Loriol, Monographie des Couches de I'etage 

 Valangien d'Arzier (Vaud), Paleontologie Suisse, ser. 4, vol. 2, p. 61, 

 pi. 5, figs. 15, 16. 



Measurements. — Diameter of orifice, 0.10 mm.; di- 

 ameter of peristome, 0.12 mm.; distance of tubes, 

 0.34 mm.; separation of peristomes, 0.40 mm. 



Affinities. — The figured specimen is not in the 



ReiJtomultis parsa form of growth but is an irregular 



Berenicea; it encrusts a sponge. The zone of growth 



is not visible. The exterior aspect of the tubes is 



that of the figure of De Loriol, but this author has 



FiQ.i.-ciinoporo j^gygj. myen the micrometric measurements. Our 



guaanpartita, new o 



species. A.B.Lon- determination remains therefore doubtful. 



gitudinai and trans- Occurrence.—Lower Cretaceous (Aptian): Faring- 



verse sections, X 16. v r / o 



Lower Cretaceous don, England. 



ioTSianf """' Plesiotype.— Cat. No. 69849, U.S.N.M. 

 Genus CLINOPORA Marsson, 1877 



1877. Clinopora Marsson, Die Bryozoen der weissen Schreibkreide der Insel 

 Riigen, Palaeontologische Abhandlungen, vol. 4, p. 24. 



This genus is still little understood. The published sections are 

 not in accord, and those which we give are still somewhat different. 

 We have not been fortunate enough to discover the ovicell. The 

 anastomosing lines which ornament the surface and form the chief 

 generic characterictic seem to correspond only to parietal thickenings. 



Genotype. — Clinopora {EntalopJiora) lineata Beissel, 1865, Cre- 

 taceous. 



CLINOPORA QUADRIPARTITA, new species 



Plate 29, figs. 8-11 



Description. — The zoarium is free, cylindrical, bifurcated in the 

 same plane. The tubes are visible, separated by salient threads di- 

 vided into /our parts by other anastomosing threads. The orifice is 



