230 



Formå færoénsis præcipue differt spinis longioril)us, latitudine 

 cellulæ majore. 



Long. = 57;m; lat. — 60,m; long. spin. = 19 /«; lat. isthm. = 11 fi; 

 crass. = 30 /^. 



The specimens from the Færoes differ from Ihe Scottish ones in 

 their longer spines, their proportionally greater breadth and shorter 

 length, in the rounded apices of the semicells in front view and the 

 slender form of the semicells in vertical view. Altogcther the form 

 from the Færoes approaches rather near to A'. tetracentrotiim Wolle 

 (ofr. W.West and G.West: On some North American Desm. tab. 15, 

 fig. 24); cfr. also X. Iiastifernm Turner § inevolutiim Nordst. 



Found hl I'lankton from Sorvaagsvatn (Vaago). 



177. Staurastpum punctulatum Bréb. 



Common in the collections. Wille also found this species (1. c. p. 29). 



Var. Kjellmani Wille. 



In gathcrings from Thorshavn (Str.); and a waterconrse on San do. 



178. S. pygmæum Bréb. 



Occurs in several gathcrings from tlie neighljourliood of Thors- 

 havn (Str.). 



179. S. hexacerum (Fhrenb.) Wittr. 



In Planlvton from tlie large lake near Ejde (Ost.). 



Var. semicirculare Wittr. 



Gotl. och Ol. Solvattensalg. p. 52, tab. IV, lig. 9. 



Occurs in a gathering from Nol s 6. 



180. S. alternans Bréb. 



In materials from Gliversrejn near Thorshavn (Str.); and Skopen 

 (Sand 6). 



181. S. polymorphum Bréb. 



In a gathering from Hojvig and Skjælling (Str.); No Is 6; and 

 Trangisvaag (Syd.). 



182. S. hirsutum (Ehrenb.) Bréb. 



In a gathering from Klakken near Klaksvig (Bordo). 



183. S. pilosum (Nagl.) Arch. 

 Long. r= 40 ju; lat. = 32 ii. 



In collections from Gliversrejn (Str.); and Viderejde (Vid.). 



184. S. teliferum Balfs. 



Seems to be common in the Færoes; it was first found by Rostrup 

 (1. c. p. 90). 



