90 



Description of I. Brun's Campylodisci. 



i. Campylodiscus albifrons, limn. 



Dial. Especes Nouv., p. 14, pi. XXI.. t. a 

 Brun., Collect, slick- 2173. 

 < '.roup of the Punctata-. 



Dimensions: — 



Diam. of valves, 0-139 man. 



Diam. of area, 0096 m.m. 



Length of rays. o'oi6 m.m. 



Diam of inter-radial spares, 0-003 m - m - 



Valves circular. Area circular. Rays short, narrow, teeth-like, 

 straight, terminating inside in two minute apiculi, carrying 3 or 4 

 longitudinal rows of finely punctate striae or lines. Extreme 

 margin ol valve coarsely striate. Area formed by, 1st. a smooth 

 ring, 0006 wide ; 2nd, a circle, 0-009 wide, carrying numerous 

 irregularly scattered puncta ; and 3rd, a broad, smooth, central, 

 circular space, 0066 in diam. No appearance of a true circlet. 

 \ marginal, inter-radial beads. The affinity of this sp c < ies with 

 the C. lepidus of Castr. (C. Pfitzeri, A. S.), which Prof. Brun indi- 

 cates, is erroneous, as this last species has distinctly infundibuli- 

 form rays, with a notable stem to the funnels and also a genuine 

 circlet, formed by short, fine, subparallel lines. 



C. albifrons is indicated from Hong Kong and from Yoko- 

 hama. This diatom has some affinity with my C. margosinuatus, 

 but is readily distinguished by the characters of the Area and Rays. 



2.— Campylodiscus altar, J. Brun. 



Diat. Esp. Nouvelles, p. 14, pi. XXL, f. 1. 

 Group of the Striata?. 



Dimensions : — 

 Diam. of valves, 01 16 m.m. 

 Diam. of area, 0-063 m.m. 

 Length of rays, 0-026 m.m. 

 Length of marginal beads, 0*006 m.m. 

 Length of striae, 0016 m.m. 



