CAMPYL0NE1S. 



285 



A. excentrica (Donk.) Grun. (Nov., p. 10; Cocconeis eximirica 



Donk.). 



Valves suborbicular, furnished with a large marginal ring, finely striated. 

 Valves with robust striae about 7 in 1 c.d.m., composed of elongated beads 

 forming irregular longitudinal lines. Lower valve furnished with raphe and 

 nodules, the upper having only a pseudo-raphe. Length, about 5 c.d.m. 

 Breadth, 4*5 to 5 c.d.m. 



Marine.- England (Donkin, Kitton, Comber). North Wales. 



GENUS 33.-CAMPYLONEIS GRUN., 1863. 



Upper valve cellular, such structure being wanting in the median 

 portion ; lower valve formed of two layers : the upper formed of a 



a. fi. c. 



Fig. 6-j. Campyloneis Grevillei. 

 a. Upper valve. b. Lower valve. c. Stratum of costae of ditto. 



grating of robust costae, the lower layer consisting of a normal valve 

 furnished with raphe and nodules, and covered with distinctly 

 punctated striae. 



One species : Characters of genus ; terminal nodules distant from apices. 



C. Grevillei (W. Sm.) Grun. {Cocc. Grevillei W.Sm. ; S.B.D., 

 I, pi. 3, f. 35 ; H.V.H. Atl., pi. 28, f. 10-12*; Type No. 243), plate 8, fig. 



344- 



Upper valve with small cells, those in the portion without structure, 

 elongated; stria; of lower valve about 18 in 1 c.d.m. Length, 4 to 6 c.d.m. 



Marine. England (Grev. , Shadbolt, Kitton, Norman). Jersey (Arnott). 



var. Argus Grun. (in Wien. Zool. Hot. Gesel, p. 429, pi. 10, f. 

 9 ; H.V.H. Atl., pi. 28, f. 15, 16*), plate 8, fig. 345. 



Upper valve with very large cells, almost or quite similar ; interior 

 cells slightly elongated. 



Marine. These two forms have not yet, bat will very probably be found in Belgium. 

 They exist in lingland (Kitton), Scotland and France. 



