10 P. T. CLBVE, ON DIATOMS FROM TIIE ARCTIC SEA. 



I, fig. 10— Ii and Pl. II, fig. 12). Spetsbergen Kings Bay only 

 one specimen. 



?24. Cerataulus Sraithii Ralfs (Eupodiscus radlatus Sm. Syn. 

 I, pag. 24, Pl. XXX, fig. 255). Spetd>ergen Kings Bay several 

 specimens. 



Occurs besides on the coasts of tlie Xorth Sea. 



?25. Amphitetras antediluviana Ehb (Sm. Syn. II, pag. 47, 

 Pl. XLIV, fig. 318). Spetsbergen: Kings Bay, only one speci- 

 men. Tliis species occurs besides in most seas. 



26. Plagiogramma Staurophorum (Grev) PIeiberg (Denti- 

 cida stauroph. Greg Diat. of Clyde, pag. 496, Pl. X, fig. 37). 

 Spetsbergen: BrandAvyns Bay. Greenland not very rare. Fin- 

 ritarl:en: Grötsund rare. 



This species occurs besides on the coast of Sweden, 

 Denmark and Great Britain. 



27. Asteromphalus Brookei Bail {Pritch Inf. pag. 837, 

 Pl. V, fig. 79). Greenland: Davis Strait in mud from great 

 depths. Small forms; Diam. 0,0 5 m.m., rays 6 — 8 Pl. IV fig. 19. 



Found before near Kamtcliatka and in the Atlantic. 



2S. Isthmia nervösa Kg (Sm Syn. II, pag. 53, Pl. XLVII). 

 Very rare. Spetsbergen: Waijgats Ids. (60 fths). Beeren El- 

 land one valve found in the bottom-clay from the depth of 

 1200 fathoms. L^elaml (according to Lyngbye). 



29. Isthmiella enervis (Ehb) Cl (Isthmia enervis Sm Syn 

 II, pag. 52, Pl. XL VIII). Spetsbergen: Kings Bay (160 fths) 

 Finma7'ken Grötsund . 



I have separated the new genus Isthmielhi from Istlmiia on 

 account of the abscnce of costK. 



30. Rhizosolenia styliformis Brightw. (^I. I. VI, pag. 9, 

 Pl. V, fig. 5) Northern Atlantic fi.oatIng in large masses on 

 the surface Lat. 60° 25' Long. 19° 50' (Th. Fries). Davis 

 Strait Lat. 61° 45' Long. 53° 43'. This Oceanic species is 

 widely distributed as in Xorth Sea (Helgoland, Max Schute 

 and on the coasts of Great Britain) Sea of Java (Cl) Xico- 

 baren Ids. (Grun). 



31. Rhizosolenia alata Brightw (M. I. VI, pag. 95, Pl. 

 V, fig. 8). Xorthern Atlantic (Lat. 61° 25' Long. 19° 50' Th. 

 Fries) sparingly on tho surface of the sea. 



