44 ERNST 0STRUP 



Surirella islandica sp. nov., Tab. nost. IV, fig. 6.1. 



Long: 28 it, lat: 7 //, canalic. 5 in !()//. 



Valva lineari-elliptica, canaliculis marginalibus. 



Vnllanes (E/) 13. P. 



This small form reminds somewhat of the S. minuta Breb.. figured 

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

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



Surirella Jonssoni sp. nov.. Tab. nosl. IV, fig. 66. 



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



Valva linear!, delicatissime transverse lineata, apicibus cuneatis. 

 Linea apicalis vix conspicua adesl. 



Desjamyri (E.) H. .Is. 



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

 gracilis Grim., 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. All., Tab. XXIII, 

 fig. 27. 



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

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



Var. conslriclu Grun. De Toni Syll., 568. A. S. All., Tab. XXIII, 

 fig. 28. 



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

 Area : Eur., Am. 



Surirella Molleriana Grun. 0st. F?er. Freshw. 285, fig. 49. A. S. All., 

 Tab. LVI, figs. 2122. 



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

 Area: Eur., As., Am. 



Surirella ovalis Bivb. var. angusta Ktz. V. H. Trl. 373, Tal). XIII, 

 fig. 590. 



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

 Area: Eur., Af., As., Am., Grl., Spb., F/. .1. 



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

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

 Area: Eur., Af., As., Am., C.rl., H. E. 



Tar. ovata Ktz. V. II. Trt. 1. c., Tab. c., fig. 587. 

 97 samples (S. 34, S.W. 28, N.W. 2, N. 1 (1. E. 17). Hot springs: 5. 

 Ari-n: Kur., Af., As, Am.. Grl., H. E., Spb., K/. J. 



I have found nearly circular forms of Ibis variant in t\vo samples 

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



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



:i( samples (S. 0, S.W. 9, N.W. 1, N. 3, E. 14\ 

 Area: Eur., Spb. 



