TRACHYSPHENIA. 



33 1 



R. Liburnica Grun. ! (Neue etc., 1862, p. 69, pi. 7, f. 6 ; 

 H.V.H. Atl., pi. 36, f. 33*), plate 10, fig. 400. 



Valve broadly elliptic, with narrow pseudo-raphe ; puncta arranged in 

 radiant lines, about 4 in 1 c.d.m., central puncta very large, diminishing 

 towards the margin, which bears right round its edge a row of much smaller 

 beads, about 6 in 1 c.d.m. Mean length, 3 c.d.m. 



Marine. Blankenberghe, second Basin. Very rare ; only one specimen observed. 



Fig. 86. 



Trachysph enia 



Austi aiis, 



var. Aucklandica. 



GENUS 50. TRACHYSPHENIA P. Petit, 1877. 



Valves cuneate, furnished with coarse puncta, 

 arranged in longitudinal and transverse rows. Pseudo- 

 raphe rather narrow. Frustule and connecting zone 

 rectangular. 



Upon the whole, the Trachysphenia is nothing more 

 than a Raphoneis, one of whose apices is narrower than the 

 other. Only a single species is known, the Trachysphenia 

 Austtalis P. Pet. (fig. 86), which was found in the Isle of 

 Campbell, at Cape Horn, &c. The valves are 3*5 to 5 

 c.d.m. in length and have six rows of beads in 1 c.d.m. 



GENUS 51. SCEPTRONEIS EHR., 1844. 



OO C'.l 



Valves cuneate, with structure similar to that of 

 the Raphoneis ; girdle face and connecting zone 

 cuneate. 



Fig. 87. 



Sceptroneis 



Caducens. 



