EUCAMPIA. 



461 



III. Eucampie.k. Pelagic diatoms, with frustules slightly 



silicious. 



GENUS 127. 



EUCAMPIA EHR. (1839), 



Char, emend. 



Frustules imperfectly sili- 

 cious, cuneate, united in 

 a spiral filament. Valve 

 elliptic, with process slight 

 or absent. 



Fig. 191. Eucampia Zodiacus. 



ANALYSIS OF SPECIES. 



Valves apparently excavated in the girdle face 



Valves plane, not excavated .... 



E. Zodiacus. 

 E. Britannica. 



E. Zodiacus Ehr. (Kreideth, p. 71, No. 41, pi. 4, f. 8 ; H.V.H. 



Atl., pi. 95, f. 17, 18* ; pi. 95 bis, f. 1 and 2*), plate 19, fig. 628. 



Valve elliptic, rising gently towards the apices so as to form two robust 

 rounded processes, furnished with a central pseudo-nodule, striae delicate, radiant, 

 finely punctate, above 16 to 18 at the margin of the valve. Girdle face 

 cuneate, at the valve portion striate, with connecting zone showing some 

 longitudinal plicae. Length of valve, 4 to 5.5 c.d.m. Frustules united into 

 a perforated filament. 



Marine. Rare. Blankenberghe 2nd Basin. In June, 1893, while engaged in pelagic dredging 

 in the Scheldt opposite Hansweert I found this Eucampia in considerable quantity. Some of 

 these were good specimens, being joined in a spiral filament of more than one complete whorl. 

 England (Kitton, Comber, W. Sm. ! Stolterfoth !), France (De Breb.), Holland (Suringar), near 

 Cuxhaven (Kiitz.). 



E. Britannica W. Sm. (S.B.D., ii., p. 

 25, P l. 61, f. 378*), plate 34, fig. 893. 



Valves plane, frustules united into a continuous 

 filament, not excavated. 



Marine. Sussex, England (W. Sm.), Yarmouth (Kitton). 



Molleria cornuta Cleve. (f\g. 192) is a true 

 Eucampia; it is characterised by its valves being 

 excessively excavated, and by the apices of 

 the valves being consequently prolonged into 

 horns. 



Fig. 192. Moileria 

 cornuta. 



