KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. !8. n:o 5. 17 
Surirella Torriv. 
1. Surirella Caldensis Cu. N. Sp. 
Very long and slender, linear, with cuneate ends. Ale high. Canaliculi short, 
numerous, 4—5 in 0,01 mm. Margin striate; striae punctate 20 in 0,01 mm. F. V. 
linear, not cuneate. 
Length 0,108 mm. Breadth 0,013 mm. 
Pi. TV, fig. 60, 7). 
Brazil, Caldas on Sphagnum (Dr. Hs. Mostyn). Cx. et Moz. Diat. N:o 212, 
common. 
This species comes near to S. arcta A. Scum. Atl. Pl. 23, fig. 23—24 from De- 
merara, but its canaliculi are shorter and denser. 
2. Surirella degenerans Cu. N. Sp. 
Oblong, with very broad ends and slightly contracted middle. Margins striate. 
Coste obsolete, consisting only of the dilated portion. Area with some scattered mar- 
kings and strie. : 
Length 0,09—0,072 mm. Breadth 0,037—0,046 mm. 
PL IN; fie By i 
Gallapagos Islands (Eugenie Exp.). 
This form, which belongs to the variable section of S. lata, is related to S. laxa 
J ANISCH. 
3. Surirella formosa Cu. N. Sp. 
Panduriform with large, rounded ends. Margin striate. Coste abbreviate, with 
the dilated portion comparatively large. The middle of the valve is occupied by a 
narrow linear area, defined by short strie. 
Length 0,22 mm. Breadth 0,11 mm. at the constriction 0,07 mm. 
Pl, TY, fig. 40,07: 
Gallapagos Islands extremely rare (Eugenie Exp.). 
This very large and beautiful Surirella does not agree with any of the many 
forms belonging to S. lata-section hitherto figured. 
Campylodiscus Ens. 
1. Campylodiscus (Eeclesianus var.?) peramplus Cu. 
Very large, coste numerous 4—5 in 0,01 mm., equal in length, marginal. Area 
large with a circle of puncta and with some stellate markings. 
Diam. 0,12—0,16 mm. 
Pl. TY, fie. 53, "0 
Gallapagos Islands (Eugenie Exp.). 
K. Sy. Vet, Ak. Handl. Band. 18. Nio 5. 3 
