553 



JSTHMIA Ag. 1820, V. 11. Syn., p. 201. 



174. Jsthmia nervosa Ktz., W. Sm. Syn. tab. XL VII. 



Koiind in 1 ."> gatherings from Vider 6; Stromo; S l or c Di mon; 

 and Sydero; abundantly in (i from Kvivig and Vestmanhavn Stromo) 

 Store Dimon; Ordevig Sydero); and in a gathering without habitat. 



HIDDULPHIA Gray 1831, V. II Syn., p. 203. 



17;"). Biddulphia aurita Bréb., W. Sm. Syn. tab. XLV., fig. 319. 



Found dispersed in 13 of the gatherings Ironi Bordd; Ostero; 



Stromo; and Sydero. Usually a l'ew examples only, bul more fre- 

 quently in two gatherings from Thorshavn (Stromo); and Vaags Ejde 



(Sydero). 



ACTINOPTYCHL'S Ehr. 1838, V. II. Syn., p. 210. 



176. Actinoptychus undulatus Ehr., V. H. Syn., tab. CXXII., lig. 3. 



Found dispersed in 8 gatherings from Ostero and Stromo. 



The Færoese form agrees well with Van Heurch's figure quoted 

 ahove (drawn alter a specimen trom the Depot de Richmond), hul its 

 diameter is scarcely hall' so large (0,03 mm. . 



ACTINOCYCLUS Ehr. 1840, V. H. Syn., p. 215. 



177. Actinocyclus subtilis (Greg.) Ralfs, V. H. Syn. tab. CXXIV., 



fig. 7. 



Molen, Ejde (Ostero); Thorshavn (Stromo); Troldhoved (S an do 

 Tværaa (Sydero). Everywhere in a few specimens. 



COSCINODISCUS Ehr. 1838, V. H. Syn., p. 216. 



178. Coscinodiscus excentricus Ehr. 1838, V. H. Syn. tab. CXXX., 

 fig. 4. 



Ordevig (Sydero . 



179. C. lineatus Ehr., V. H. Syn. tab. CXXXI., fig. 3. 

 Skaalcfjord (Ostero. 



180. C. curvatulus Grun. var. inermis Grim., Grim. Fz. .los. L. 

 tab. IV., figs. 11—12. 



Found only in a gathering without habitat. 



181. C. radiatus Ehr. var. minor A. S., V. H. Syn. tab. CXXX., fig. 3. 

 Found in two gatherings without habitat. 



182. C. Asteromphalus Ehr., V. H. Syn. tab. CXXX., figs. 1—2. 



Thorshavn (Stromo). 



The above-mentioned species of Coscinodiscus occur only singly at 

 the stated habitats. 



