712 Bacillariese, Plagiogrammace?e, Dimerogramma. 



p. 23, t. II, f. 34. — Minus, raedio inflatura, apicibus dilatatura; 

 valvis ovalibus, 11-18 u.. longis, polos versus subito attenuatis; 

 striis 9-11 in 10 u. 



Hab. ad oras Scotiae (Gregory), Hiberniae, in arena litorali 

 maris adriatici (Lorenz), in limo maritimo maris raediterranei ad 

 «Cap Martin» (Boettcher) ; in algis marinis «Cap S. Andrea» pr. 

 (cGenova» (Piccone). — Var. tahitiense Castr. Diat. Challenger 

 p. 46, t. 19, f. 5, Notarisia 1889, pag. 685: a typo vix apicibus 

 magis dilatatis rotundatisque recedit; valvis 22-23^9 (ex icone). 

 In portu «Tahiti» (Exped. Challenger). 



3. Dimerogramma fulvum (Greg.) Ralfs in Pritch. Inf. p, 790, Grun. 2878 

 in Wieu. Verhaudl. 1862, p. 376, Rabenh. Fl. Eur. Algar. I, p. 124, 



V. H. Syn. t. 36, f. 7? t. 36, f. 28, Denticula fuUa Greg. Diat. 

 of Clyde p. 496, t. 10, f. 38. — Rlongatum, subgracile; valvis an- 

 guste lanceolatis, 42-110 \j.. longis, apicibus rotundatis subcapitato- 

 productis; striis granulato-moniliformibus, 10-11 in 10 a. ; area 

 angustissima, e medio latiori lyrellaeformi percursa. 



Hah. ad oras Scotiae (Gregory), Sueciae, Hiberniae, in mari 

 adriatico (Lorenz); in Peyssonnelia Dubyi in (c Banc de St. 

 Marc, rade de Brest» (Desmazieres). — Var. Ffurcigerum Grun. 

 in V. H. Syn. t. 36, f, 8: apicibus lineola obscure duplici ornatis. 

 In raari mediterraueo. 



4. Dimerogramma capitatum (Greg.) Ralfs in Pritch. Inf. p. 790, Grun. 2S79 

 in Wieii. Verhandl. 1862, pag. 377, Rabenh. Fl. Eur. Algar. I, 



p. 123, Denticula capitata Greg. Diat. of Clyde pag. 494, t. 10, 

 f. 31. — Robustum, apicibus rotundatis, valvis late lanceolatis, 

 40-65« 12-13, apicibus obtusis, striis subtilibus 7-9 in 10 u.. 



Hab. in c^ Loch Fine » Scotiaj (Gregory) ; ad (c Cap Martin » 

 prope (cMentone» (Boettcher). 



5. Dimerogramma marinum (Greg.) Ralfs in Pritch. Inf. p. 790, Rabenh. 2880 

 Fl. Eur. Algar. 1, p. 124, V. H. Syn. t. 36, f. 9, Deniicida ma- 

 rinu Greg. Diat. of Clyde p. 29, t. 2, f. 39. — E maxirais, valde 

 eloiigatuin, liiieare; valvis linearibus, 200-220 u.. longis, raedio le- 

 viter inflatis, apicibus subito attenuatis obtusis; striis monilifor- 

 mibus remotis, vix 4 in 10 [j.., area vittaeforrai percursa vel sub 

 apicibus evanescente. 



/lab. ad oras Scoti;e (Gregory) et Hiberoiae (0' Meara). 



6. Dimerogramma Surirelia (Eur.) Grun. in Clevp Diat. fr. West. Ind. 288I 

 Archip. p. II, n. 89, Zijgoceros Siirirella Ehr. Kreid. 1840, t. 4, 



f. 12?, Kuetz. Bacill. t. 18, f. 12!, Roper in Micr, Journ. II, p. 76, 



