218 



differs from it in the sinuses being less deep, this applies more 

 particularly to the sinuses on both sides of the polar lobe. 

 • Long. = 97 |M ; lat. = 88 |M ; crass. — 51 |W. 

 Svartafoselv at Højvig (Str.j; Skopen and Grothusvatn (^Sando). 



The second form (Plale VII fig. 2') was likewise characterized 

 by being less deeply sinuated and especially by the broad rounding 

 of the lower angles of the semicells ; seen from the base the semi- 

 cells were oblong quadratic. It is to be supposed that this form 

 is produced by individuals which are in active division; it seems 

 to be a similar form which West calls var. coarctatiim Delp. formå 

 (Freshwat. Algæ of West Ireland p. 136, tab. XX, fig. 11). 



Long. = 88—92 /<; lat. = 70 ,m ; crass. — 51 /-«. 



Found mixed together with the above-meiilioned in Svartafoselv 

 near Hojvig (Str.). 



104. E. gemmatum Bréb. 



Svartafoselv near Hojvig (Str.); Grothusvatn uSando). 



105. E. inerme (Ralfs) Lund. Platc VII, fig. 4. 



The specimens from the Færoes correspond closely to the 

 original figure of Ralfs (Brit. Desm. tab. XIV, fig. 7 c); in comparing 

 the specimens from the Færoes with Lundell's figures (Desm. Suec. 

 tab. II, fig. 3) I found that the 3 protuberances at the base of the 

 semicells wiiich are conspicuous in his figures were absent in the 

 specimens from the Færoes. 



Kirkebokamp (Str.); Klakken near Klaksvig (Bordoj; Sand (Sand 6. 



106. E. pectinatum Bréb. 



Seems to be rather common; it has been found near Midvaag 

 (Vaago); Klakken near Klaksvig (Bordo); Skopen (Sando); and Svarta- 

 foselv near Hojvig and Thorshavn (Str.). 



107. E. Lyngbyei nov. sp. Plate VII, fig. 5. 



E. submediocre, diametro subduplice longius, incisura mediana 

 profunda lineari in exteriore parte ampliata. Semicellulæ trilobæ, 

 angulis dentibus munitis fere rectis, apice truncato medio tumoribus 

 3 ornatæ; a vertice visæ ellipticæ lateribus 3 prominentibus in- 

 structæ; a latere fere ovatæ. 



Long. = 55;m; lat. = 37/<; lat. isthm. = 9|m; crass. = 21,6 |M. 



In a gathering from Sand (Sando). 



In front view this species resembles somewhat Euastnim pectiimiiim 

 Formå Lundell (Desm. Suec. p. 17, tab. 1, fig. 8). 



