44 ERNST ØSTRUP 



Surirella islandica sp. nov., Tab. nost. IV, fig. 65. 

 Long: 28 jti, lat: 7 /*, canalic. 5 in 10 ju. 

 Valva lineari-elliptica, canaliculis marginalibus. 



Vallanes (E.) B. P. 



This small form reminds somewhat of the S. minuta Bréb., figured 

 in Pant. Bal., Tab. XI, fig. 286. As to the claim of this appellation see 

 besides O. M. Pat., pag. 37-38. 



Surirella Jônssoni sp. nov., Tab. nost. IV, fig. 66. 



Long: 81 //, lat: 9 //, canaliculis 5,5 in 10 //. 



Valva lineari, delicatissime transverse lineata, apicibus cuneatis. 

 Linea apicalis vix conspicua adest. 



Desjamyri (E.) H. Js. 



This form is possibly related to, though hardly identical with Sur. 

 gracilis Grun., V. H. Syn., Tab. LXXIII. fig. 16, which shows a similar 

 transversal striation of very fine rows of puncta. 



Surirella linearis W. Sm. V. H. Trt., 369. A. S. Atl., Tab. XXIII, 

 fig. 27. 



21 samples (S. 3, S.W. 5, N. 7, E. 6). 

 Area : Eur., Af., As., Am., Spb. 



Var. constricta Grun. De Toni Syll., 568. A. S. AU., Tab. XXIII, 



fig. 28. 



8 samples (S. 1, S.W. 2, N. 2, E. 3). 

 Area : Eur., Am. 



Surirella Mölleriana Grun. Øst. Fær. Freshw. 285, fig. 49. A. S. Atl., 

 Tab. LVI, figs. 21—22. 



11 samples (S. 1, S.W. 5, N. 2, E. 3). 

 Area: Eur., As., Am. 



Surirella ovalis Bréb. var. angiista Ktz. V. H. Trt. 373, Tab. XIII, 

 fig. 590. 



21 samples (S. 3, S.W. 5, N. 3, E. 10). 

 Area: Eur., Af., As., Am., Grl., Spb., Fz. J. 



Var. minuta Bréb. V. H. Trt. 1. c, Tab. c, fig. 588. 

 23 samples (S. 1, S.W. 5, N. 3, E. 14). Hot springs: 2. 

 Area : Eur., Af., As., Am., Grl., B. E. 



*Var. ovata Ktz. V. H. Trt. 1. c, Tab. c, fig. 587. 

 97 samples (S. 34, S.W. 28, N.W. 2, N. 16, E. 17). Hot springs: 5. 

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



I have found nearly circular forms of this variant in two samples 

 from Borg (S.W.) B. P., Slutnes (N.) B. P. 



Var. pinnata W. Sm. V. H. Trt. 1. c, Tab. c„ fig. 591. 

 36 samples (S. 9, S.W. 9, N.W. 1, N. 3, E. 141 

 Area : Eur., Spb. 



