700 Bacillarieae, Fragilariaceae, Rhaphoneis. 



ginia et Marylaudia Americae borealis (Ehrenberg). — Frustula 

 stipite fulta — Var. rhombica Grun. in V. H. Syn. p. 147, t. 36, 

 f. 20-21 : valvis brevioribus, 30-50 a. longis, magis tumidis, api- 

 cibus parura rostratis. 



2. Rhaphoneis belgica Grun. in V. H. Syn. p. 147, t. 36, f. 25, 29- 2812 

 30. — Valvis anguste lanceolatis vel linearibus, 80-90 /j.. longis, 

 apicibus rostratis, obtusis vel subobtusis; striis rectis vel vix ra- 

 diantibus, 7-9 in 10 u.., oranibus asquiiongis, pseudorhaphen angu- 

 stara linquentibus, punctatis, punctis lineas longitudinales rectas ef- 

 ficientibus, apicibus valvsB subtiliter sparseque punctatis. 



Uab. in aquis marinis ad « Blankenberghe» Belgii. 



3. Rhaphoneis nitida (Greg.) Grun. Alg. Novara p. 99, Rhaphoneis 2813 

 liburnica Grun. in Wien. Verhandl. 1862, p. 283, t. 4, f. 7 (for- 



ma apicibus rotundatis), Cocconeis nitida Greg. Diat. of Clyde 

 p. 492, t. 9, f. 26. — Valvis late ovato-ellipticis, 35-48 y.. longis, 

 pseudorhaphe angustissime lineari-lanceolata, punctis in series ra- 

 diantes circiter 4 in 10 ij.. dispositis, centralibus raajoribus, dein 

 marginem versus gradatim decrescentibus, margine serie granulo- 

 rura, circ. 6 in 10 y.. ornato. 



Hab. in fundo raaris adriatici, raro (Lorenz), ad oras Scotise 

 (Gregory), ad ((Blankenberghe» Belgii, semel (Van HeurCk); in 

 sabulosis raarinis ad (( .-Vuckland » (Frauenfeld). 



4. Rhaphoneis Rhombus Ehr. in Abh. Berl. Akad. 1844, p. 87, Mi- 2814 

 krogeol. tab. 18, f. 84 et 85, t. 33, XIII, f. 19, Roper in Trans. 

 Micr. Journ. II, t. VI, f. 7-10, Rabenh. Fl. Eur. Algar. I, p. 125, 

 Cocconeis Rhombus Ehr. 1840. — Parva ; valvis late lanceolatis 



vel rhomboideis, 22-34 a. longis, parura vel bis terve longioribus 

 quara latioribus, apicibus vix productis obtusis v. rotundatis ; striis 

 transversis punctatis, 7-8 in 10 ^., medio area polos versus dila- 

 tata interruptis. 



Ilab. in limo portuura ad litora raaris septentrionalis nec non 

 in ostiis fluminura Albis, Rheni, Tagi, Thamesis (Roper) etc, in- 

 tra Salpara in raari mediterraneo prope «Messina» Sicili^ lectara 

 (Castracane); in Virginia (Ehrenberg). — Rhaphoneis Rhombus 

 Grun. in Wien. Verhandl. 1862 cum Bimerogrammaie Surirella 

 Grun. congruit. — Var. Intermedia Pant. Foss. Bacill. Ungarns I, 

 pag. 35, t. XXVIII, f. 275: valvis late lanceolatis, 44^24, polis 

 productis, subcapitatis, rotundatis; area raedia levi, elongata; striis 

 71/2 i» 10 ?■'■, puuctatis, radiantibus; punctis ^Yg in 10 y.. in lineas 

 longitudinales dispositis. Fossilis ad «Szent Peter» Hungarise. — 



