570 Baeillariese,. Suinrellaeeae, Surifaya. 



tundatis, iiitrorsum late marginatis, in utroque latere costis 5, pseu- 

 dorliaphe latiuscula subundulata. 



liab. ad insulam a St. Kitts » (L. Rabenhorst). 



11. Suriraya helvetica Brun Diat. Alp. p. 100, t. 2, f. 4, t. 9, f. 28. 2226 

 — Valvis elliptico-oblongis, 40-70 u.. longis, apicibus conicis ro- 

 tundatisve, costis e prorainentils validis, cuneiformibus, margaritatis, 

 nream medianam attingentibus paulloque convergentibus constitu- 



lis, granulis irregulariter dispositis; facie frustulorum connectivali 

 elongato-quadrangulari, apicibus rotundatis. 



Ilab. in aquis limpidis alpinis et lacubus Helvetise (Brun). 



b) Valva^ medio constrictae. 



12. Suriraya Smithli Ralfs in Pritch. Inf. p. 794, Rabenh. Fl. Eur. 2227 

 Algar. I, p. 52, <S. constricta W. Sm. Br. Diat. I, p. 31, t. 8, f. 59. — 

 Major: valvis oblongo-lanceolatis, 65-130 [j.. longis, medio leniter 

 constrictis, utroque polo obtusiusculo-cuneatis, costis inciinatis, 4- 



4V., in 10 a., vitta angusta percursis; frustulis e facie connectivali 

 visis oblongis, obtuse quadrangulis, ut fere in S. biseriaia, vitta 

 lata levi; valvis carina evidenter alata donatis. 



Hab. in aquis subraarinis Germanise, Daniae, Auglise atque in- 

 sularura vicinarum (e. g. (( Norderney, Fohr»); in Galicia (Gutwin- 

 SKi) et Polonia (Tondera sec. Gutwinski). 



13. Suriraya superba Grev. Diat. Trop. a. South Hemisph. p. 436, 9908 

 t. 6, f. 1-2, Trans. Bot. Edinb. VHI, t. 3, f. 1-2. — Magna, elon- 

 gata, 120-270 u.. longa, frustulis e facie connectivali visis late li' 

 nearibus, apicibus truncatis angulisque rotundatis; valvis panduri- 

 forraibus, apicibus cuneatis, subacutis; costis delicatis, pseudorha- 

 phen attingentibns, interstitiis subtiliter punctatis. 



ILab. ad insulara Cubara (H. L. Smith). — Surirat/ce Smithii 

 Ralfs affinis. 



14. Suriraya antarctica Ehr. Mikrogeol. t. 35 A, II, f. 20, Grun. in 22211 

 Wien. Verhandl. 1862, p. 449. — E rainoribus, Surirai/ce Smilhii 

 Ralfs sirailis, costis, ut videtur, pauUo confertioribus. 



Ilab. in limo insulae Kerguelensis (Ehrenberg), 



15. Suriraya triscalaris Brun Diat. esp. nouv. p. 46, t. 14, f. 4. — 2230 

 Valvis panduriformibus, robustis, 200-300 a. longis, costis apicem 

 versus elevatioaem bibacillarem gerentibus; area traiisvorsa nu- 

 merose plicata, serie striarura breviura marginata, cetera valv?e 

 superficie striis transversis subtilibus exarata. 



