42 ERNST (JSTRUP 



1'inlcr A. minut. I include vnr. cryptocephala (cnfr. Cl. 1. c. . which 

 can hardly he kept apart from the typical species. 



Achnanthes tylophora (Rcichelt) Cl. Reich. Schohsee, 199(Stauron. 

 lyl.), A. S. All., Tab. CCXLII, figs. 17-18 (Achn. exigua). 

 Apavatn S.. two samples) A. F. 

 Area: Eur. 



Suligenus Achnanthidinm (Kt/. 1844) Heib. 1863. Cl. Syn II, 191. 



Achnanthes Calcar Cl. Cl. Syn. II, 174. Cl. Finl., Tab. Ill, fig. 8. 



6 samples ;S. 2. SAY. 1, N. 2. E. 1). 



Area: Eur. 



Clcve places this species under "Eucocconeis". YVhen I have moved 

 it from there, it is owing to the horseshoe marking, which, it seems to 

 me, approaches it to the group of Achn. lanceolata. 



Achnanthes coarctata (Bres.) Cl. Syn. II, 192. V. H. Trt., Tab. VIII, 

 fig. 327. 



39 samples (S. 9. SAY. 8, NAY. 1, X. 6, E. 13, s. 1. 2). Hot spring: 1. 



Area: Eur., Af.. As.. Am.. Grl.. J. M., B. E., Spb. 



I have given a figure of a square form of A. coarctata on Tab. 

 nost. IY, fig. 61. It resembles somewhat the A. coarct. elineata Lgst., figured 

 in O. M. Pat., Tab. 1, iig. 8, which variant, however, is referred by Cleve, 

 1. c. to the typical species. I found it in a sample from Yik (S.) H. Js. 



'Achnanthes lanceolata Brt-b. Cl. Syn. II, 191. V. H. Trt., Tab. VIII, 

 fig. 336. 



140 samples (S. 53, SAY. 29, NAY. 10, N. 10, E. 38). Hot springs: 9. 

 Area: Ubiquist. 



Var. capitatfi O. M. O. M. Pat., 8, Tab. I, figs. 67. 



Krokur (S.) H. Js., Skutustadir (E. two samples) B. H. 

 Area: Am. 



Var. tlnhid C.run. Cl. Syn. II, 192. V. H. Trt., Tab. VIII, fig. 337. 

 Apavatn (S.) A. F. 

 Area: Eur., Am. 



Var. elliptica Cl. Cl. Syn. 1. c. Cl. Finl., Tab. Ill, figs. 10-11. 



Apavatn (S.; A. F.. Hornafjorfir (E.) St. 

 Area: Eur. 



Yar. fceroensis 0st. 0st. Faer. Frcsbw. 277, Iig. 44. 



:.,X samples S. 22. SAY. 7, NAY. 1, N. 1, E. 17, s. 1. 3). Hot springs: 2. 



Area : Eur.. H. E. 



Var. subin/ltila var. nov., Tab. nost. IV, Iig. 62. 

 Long: 15//, lat: 4 //, sir. 14 in 10 //. 



Valva lincari, in medio paululum inflata, apicibus rotunclatis. 

 Striis per tolain valvam radiantibus. 



