246 SCOLIOPLEURA. 



GENUS 19. SCOLIOPLEURA GRUN, i860. 



Frustules free, with valves naviculoid, very convex, slightly 

 twisted spirally so as to render the raphe and connecting zone more 

 or less obliquely-sigmoid. 



ANALYSIS OF SPECIES. 

 Valve with robust costne, between which are two rows of fine granules . S. latestriata. 



Valve with striae distinctly moniliform, about 10 in i c.d.m. ; raphe 



strongly sigmoid . . . . . . S. tumida. 



[ Striae difficult to resolve into beads, 15 in 1 c.d.m. ; raphe scarcely sigmoid S. Westii. 



S. latestriata (Breb.) Grun. ! {Amphiprora latestriata Breb. ; 



Scoliopleura cowvexa Grun.; H.V.H., pi. 17, f. 12*; Type No. 202), plate 5, 

 fig. 247. 



Valve linear, narrow, with cuneate apices. Raphe 

 surrounded by a rather considerable hyaline zone, 

 slightly dilated round the central nodule. Costae 

 robust, about 7 in 1 c.d.m., interrupted near the raphe 

 by a furrow parallel to the hyaline zone. Between the 

 costae are two rows of granules delicate, alternate, 

 seen with difficulty. Length, about 10 to 15 c.d.m. 

 Breadth, 2^5 c.d.m. 



Kitton), Ireland (O'Meara), 



Marine. Ostend (Deby), Englant 

 France, Bahusie (Sweden). 











Fig. 47. Scoliopleura 

 tumida. 



S. tumida (Breb) Rabenh. (Fi. Eur. Alg., 



p. 229- H.V.H. Atl, pi. 17, f. 11, 13*; Type No. 

 201), plate 5, fig. 248. 



Valve lanceolate, very gently attenuate, with sub- 

 acute apices. Raphe surrounded by a small hyaline 

 zone, considerably dilated at the median portion. 

 Striae about 10 in 1 c.d.m. ; those in the centre often 

 unequal in length, radiate, bent, finely punctate. 

 Length, 10 to 16 c.d.m. 



Marine. Antwerp (Scheldt), Ostend, Blankenberghe. Common : 

 England (Kitton), France, Denmark. 



S. Westii (W. Sm.) Grun. (in Wien Verh., i860, p. 555; n. 



Weslii IV. Sm., S.B.D., i., pi. 16, f. 135*), plate 28, fig. 791. 



