COCCONEIS. 289 



Valve broadly elliptic, showing a series of distinct costae, about 3-4 in 1 

 c.d.m., which, with a good objective, are resolved into fine puncta, arranged 

 alternately in two rows. Longitudinal hyaline area lanceolate. 



Marine Blankenberghe, rare (H.V. H.) ; Scotland. 



C. Lyra A. Schm. (Nordsee, pi. 3, f. 19* to the right; the figure on 

 the left belongs to another species) ; plate 29, fig. 819. 



Valve elliptic with well marked costae, about 9 in i c.d.m. interrupted by 

 sulci which, with the narrow hyaline area surrounding the raphe and the 

 pseudo-stauros, form the figure of a lyre with straight narrow arms, not 

 reaching to the apices of the valve. Length, about 2*5 c.d.m. 



Marine. Norway (Ad. Schm). 



Group 4. ACTINONEIS CLEVE. Valve lanceolate. 



CoCCOneis Danica Flog. (Diat Grundproben, p. 91, f. 14* ; 

 Lens ii., p. 23S, pi. 4, f. 9), plate 29, fig. 820. 



Valves elliptic, rhomboidal, with apices acute, somewhat attenuated. Upper 

 valve with robust stria?, distant, 6 in 1 c.d.m., all of equal length, showing 

 fine beads arranged in two rows in their intervals. Lower valve with fine 

 costae, approximate, 14 in 1 c.d.m., the median alternately long and short. 

 Raphe surrounded by a broad hyaline zone, and dilated near the central 

 nodule. Length, about 6 c.d.m. Breadth, 25 c.d.m. 



Marine. Norway. 



aa. Upper valve without costae. 



Group 5. Heteroneis Cl. Upper valve with broad axial area 

 and striae more or less submarginal. 



C. Quarnerensis (Grun.) Ad. Schm. (Nordsee, pi. 3, f. 15 



and 16*; Raplwneis Quarnerensis Grun., Die Oster. D., p. 381, pi. 7, f. 24), 

 plate 29, fig. 821. 



Upper valve with robust marginal costae, 7 in 1 c.d.m., hyaline area very 

 broad, elliptic, finely granular ; lower valve with fine costae, radiant, 7 in 1 

 c.d.m., reaching close to the raphe. Length, about 3 c.d.m. 



Marine. Norway. 



U 



