174 T. T. CLEVE ON SOME FOSSIL MARINE DIATOMS. 



ACTINOCYCL^E. 



Actinocyclus Ehrenbergii, Ralfs. (1861). Van Heurck Syn., 

 PI. 123, f. 7. 



A. (alienus, var. ? Grun.) undatus, Cleve., Disc. •07-*l mm. in 

 diameter ; pseudo nodule indistinct ; valve with radiating and 

 branching lines of puncta (or small cellular) 5-6 in *01 mm. ; 

 surface concentric, elevations and depressions. It is with some 

 hesitation I refer this form to A. alienus ; the radiating lines of 

 puncta do not form such distinctly oblique and decussating trans- 

 verse rows as shown in Grunow's figures in Van Heurck's Syn., PI. 

 125, f. 10 and 12 ; near the margin they have this arrangement, 

 but on the other part of the valve they resemble A. stibtilis., fig. 7 

 (PI. 124), PI. 13, f. 14 ±§*. 



MELOSIREiE. 



Paralia sulcata (Elib.), Cleve (1864), GallioncUa sulcata. 

 Ehb., (1838). Orthosira marina Sm. S.B.D. n., p. 59 (1856), 

 Paralia marina, Heib. (1863). 



Melosirat clavigera, Grun. Van Heurck Syn., PI. 91, f. 1-2, 

 (1881). M. Sol. (Ehr.) Kiitz. Gallionella Sol, Ehb. (1844). M. 

 Sol., Kiitz. (1849). Van Heurck Syn., PI. 91, f. 9. 



M. Omnia CI. n.sp. Valve orbicular with a circle of puncta 

 (6-7 in *01 mm.) between the margin and the centre (but nearer 

 the former), the margin finely striate (21 in •01 mm.), the re- 

 mainder of the valve smooth. Diameter, '085 mm. PI. 13, 1. 15. 



480 

 1 ' 



M. Borreri, Grev. Brit. Flora. 



Podosira antediluviana, CI. Valve very convex and robust, with 

 minute puncta scattered at the centre, but forming minute irregularly 

 radiating lines on the other parts of the valve. PI. 13, f. 16, —-. 



Pyxidicula cruciata, Ehr. (1841), Mg., PI. 33, f. 7. One speci- 

 men. Dia. '056. Cellules 3-4 in *01 mm. 



Endictya oceanica, Ehr. (1845). A. Schm. Atl., PI. 65, f. 10. 

 Diameter '09-* 15 mm. Cellules 2 in *01 mm. 



E. minor. A. Schm. Atl., PI. 65. f. 4 (1881), E. oceanica in CI. 

 and Moll, Diat. No. 110. Diameter -09 mm. Cellules 3 in 

 •01 mm. Craspcdodiscus Coscinodiscus, Ehr. (1844.) A. Schm # 

 Atl., PI. 66, f. 3-4. One specimen '11 mm. in diameter. Cellules 

 in the limbus 2 in '01 mm. ; in the concave part 4 in *01 mm, 



Coscinodiscus griseus, Grev. T.M.S., in., p. 230, PI. 9, f. 7 



