PERONIA. 333 



GENUS 53. PERONIA BREB AND ARN., 1868. 



Frustule and valve cuneate and similar to a 



Gomphonema, but differing from it by the absence 



of central nodule and raphe. Frustules sessile 

 solitary or united by twos. 



Fig. 89. 



Peronia 

 erinacea. 



Peronia erinacea Breb. and Arn. (Q.J.M.S., 1868, viii., 



p. 16; Gomphonema Fibula Breb. ohm; H.V.H. Atl., pi. 36, f. 19*; in 

 Types Nos. 67, T26, and 274), plate 10, fig. 389. 



Valve narrow, cuneate, with superior apex rostrate-capitate ; terminal 

 nodules distant from the apices; striae rather broad, but obscure, about 15 or 

 16 in 1 c.d.m., interrupted by a well marked pseudo-raphe. Girdle face 

 cuneate, with marginal striae. Length, 4 to 5 c.d.m. 



Fresh water. Rare. Cornimont (Del.), France (Breb.), England (W. Sm.). 



Fig. 90. 



Opephora 

 Schwartzii. 



GENUS. 54. OPEPHORA P. PETIT, 1888. 



Valve cuneate, furnished with long costae, distant. 

 Girdle face cuneate. Between the costae are found 

 small fine beads as in some Navicula. 



The type-species is the O. Schwartzii (Gr.) P.P. from 

 Brazil and the Seychelles. Mr. Paul Petit also includes in 

 the genus Fragiiaria parijica Grun. (H.V.H. Atl., pi. 44, 

 f. 20-22*), plate 30, fig. 846, but as it has the girdle 

 face rectangular, like Sceptroneis marina Grun. and Fragi- 

 laria pinnata F/ir., these three forms ought to be included 

 in our genus Grunoviella. 



