COCCONEIS. 287 



Valve elliptic, showing a series of robust costae 6 in 1 c.d.m., reaching 

 almost to the raphe, between which are formed fine attenuating granules ; 

 hyaline area narrow, just somewhat diminuate at the apices. Length, 2 to 2*5 

 cd.m. 



Marine. Blankenberghe (H.V.H.) Scotland (Gregory). Arctic Norway (Cleve). Bahusie 

 (Lagerstedt). 



Group 2. COCCONEIS Cl. Upper valve punctated, striate. 



ANALYSIS OF SPECIES. 



f |' Puncta sub-quadrangular, each stnas being terminated by 



Valve with | a small punctated space, triangular . . C. Scutellum. 



very coarse ~\ 

 puncta. \ All the puncta identical and very distinct . . C. distans. 



Valve with 



Ring not punctated . . . . C. pediculus. 



( finepuncta - ( Ring finely punctated . . . . C. placental a. 



* Upper valve with coarse puncta sub-quadrangular. 

 C. Scutellum Ehr. (inf., p. 95, pi. 14, f. 8; h.v.h. Atl., pi. 29, 



f. 1-3* ; Type Nos. 245, 246), plate 8, fig. 338. 



Valves very broadly lanceolate or elliptic, surrounded by a separable annulus. 

 Upper valve marked with very coarse subquadrangular puncta arranged in 

 radiating lines, about 7 or 8 in 1 c.d.m. Each row of puncta terminated at the 

 margin of the valve by a subtriangular space, covered with very fine puncta ; 

 pseudo-raphe straight, narrow. Lower valve with a ring furnished with a sub- 

 marginal row of very coarse puncta and short costae, separated by a narrow 

 hyaline zone from the internal portion which is covered with radiating stria? 

 (about 7 to 8 in 1 c.d.m.), consisting of puncta much more delicate than those 

 of the upper valve ; raphe straight ; central nodule round or dilated trans- 

 versely ; terminal nodules very small. Length, 4*5 to 6 c.d.m. 



Marine. Ostend (Westendorp !), England (Kitton, Comber, Stolt, Norm.), Ireland (O'Meara). 

 On all the shores of the North Sea. 



var. slauroneiformis. (C. stauroneiformis W. Sm.). Lower valve 

 stauroneiform. 



forma parva. (H.V.H. Atl., pi. 29, f. 8 and 9*), plate 8, fig. 339. 

 Very small, scarcely 2 c.d.m. 



C. distans (Greg.) Grun. (Novara, p. 10; Ad. Schm. Nordsee, 

 pi. 3, f. 22, 23*), plate 29, fig. 817. 



Valve broadly oval, with apices subacute, hyaline area lanceolate, rather 

 narrow. Striae 4 in 1 c.d.m., formed of 5-7 coarse puncta, very distant, forming 



