33 2 



CRUNOVIELLA. 



Sceptroneis Caduceus Ehr. (in Bed. Acad., 1844, p. 264; 

 H.V.H. Atl., pi. 37, f. 5*; Typ2 No. 279), plate 10, fig. 399. 



Valve bacillar, very elongated, with inferior portion gently cuneate. 

 Median portion very slightly inflated. Superior apex strongly capitate. 

 Pseudo-raphe narrow, somewhat enlarged in the median inflation. Strise, 

 about 4 or 5 in 1 c.d.m., formed of coarse puncta; apices covered with fine 

 puncta, radiant or sparse. Length, 10 c.d.m. 



Marine. Very rare. I have observed it once in the second Basin at Blankenberghe and 

 another time at Antwerp in the Scheldt. Mr. Deby has observed it at Flessingue at the mouth of 

 the Scheldt. Scotland (Gregory). 



GENUS 52. GRUNOVIELLA H.V.H. , 1892, Gen. Nov. 



Valve sub-cuneate, furnished with a row of coarse 

 marginal beads ; pseudo-raphe lanceolate ; girdle 

 face rectangular. 



I dedicate this genus to my excellent friend, the 

 eminent diatomographer, Mr. Grunow, who has described 

 the type-form. 



Fig. 83. 



Grunoviella 



ge??imata. 



G. gemmata (Grun.) H.V.H. (Sceptroneis? gemmata Grun. 



Hedw. V., p. T46 ; H.V.H. Atl., pi. 37, f. 3* ; Type No. 280). 



Valve lanceolate, cuneate, very narrow, with apices gently capitate, 

 furnished with a row of very coarse marginal beads, 4 to 4*5 in 1 c.d.m. ; 

 pseudo-raphe broadly lanceolate. Length, 6 to 9 c.d.m. 



Fossil. Mors, Jutland (Moller) and Franz Josef Land (Grun.) 



Observation. The girdle face appears to indicate that we are not dealing 

 with true beads, but rather a row of very short costa?. 



I include in the same genus Sceptroneis marina (Greg.) Gran. (H.V.H. 

 Atl., pi. 37, f. 2*), plate 30, fig. 845, from the Balearic Isles. 



