102 P. T. CLEVE, SYNOPSIS OF THE NAVICULOID DIATOMS. 



To this groixp of forms belongs probably B. ornata {Nav. ornafa A. S. Atl. LXIX f. 5. 

 N'. ornata spirifera A. S. Atl. CLXXXIV f. 25) from S:ta Monica and Monterey in CaKforuia. It 

 is a large and beautiful form, of whicb only corroded specimens seem to be known. At least 1 

 have hitherto not seen any uninjured specimen. 



C. Forms tvith broad lunulce. 



Var. multicostata Grun. (1860). — V. strongly constricted, witL elliptical to i'b.omboid seg- 

 ments. L. 0,09 to 0,2 1 ; B. 0,u3 to 0,o6; at the constriction 0,oi8 mm. Lnnulce ver}' broad. 

 Costa; 4 to 5 in 0,oi mm. — Nav. multicostata Grun. Verh. 1860 p. 524 Pl. III f. 13. A. S. Atl. 

 XI f. 14, 15, 16, 18, 19, 20, GLXXIV f. 6, 7. Nav. Crahro A. S. Atl. LXIX f. 1, 2. V. H. 

 Syn. p. 83 PI. IX f. 2. A. S. N. S. D. Pl. I f. 5, 6 II f. 4 (corroded). Nav. crahro var. oranensis 

 Atl. LXIX f. 3 (corroded). Nav. poUta Brun D. esp. n. p. 37 Pl XV f. 1 (corroded). 



Marine: North Sea (Norway)! Mediterranean Sea! Red Sea! Madagascar! Ceylon! LabuanI 

 Java! Samoa! Sandwich Islands (Atl.)! Galapagos Islands! Cape Jlorn (Petit)! West Indies! Fossil 

 Hungary! Moravian Tegel! Gran (Atl.), ^Egina (Atl.), Nankoori! S:ta Monica Cal. 



Var. nanlioorensis Grun. (1881). — V. less constricted, with cuneate ends. L. 0,i2; B. 0,o53; 

 at the constriction 0,042 mm. Costse. 4,5 in 0,oi mm. — Nav. Crahro var. nanJcoor. A. S. Atl. 

 LXIX f. 4 (corroded). 



Marine: Nankoori, fossil (Atl.). 



Var. 0'Meari Grun. Ms. — V. elliptical, not constricted. L. 0,135; B. 0,05s mm. Lnniilfe 

 very broad. Costa; parallel, 4 in 0, 01 mm. — Pl. II f. 12. 



Marine: Macassar Straits (Grove CoU.)! Seychelles (Grun.), South Sea (Van Heurck Coll.)! 



Grnnow sent me several years ago a sketch of an elliptical Liploneis from Seychelles under 

 the name of Nav. 0'Mearii, which agrees in essential points with the form from Macassar Straits, 

 having, as it has, very broad lunuhe, filling almost the whole valve. L. 0, 09; B. 0, 03 mm. 

 CostsB 6 in 0,01 mm. 



Var.? Gihelii A. S. (1874). — V. slightly constricted, with tongue-shaped segments. L. 0,09; 

 B. 0,033; at the constriction 0,o2t3 mm. Luniila; broad, forming a biconstricted space. Costte 4 in 

 0,01 mm. — Nav. Gihelii A. S. Probet. f. 13 Pl. XII f. 73. 



Marine: Campeachy Bay (Atl.). 



Var. minuta Cl. — L. 0,056; B. 0,024; at the constr. 0,oi6 mm. Costte 6 in 0, 01 mm. — 

 A. S. Atl. XII f. 71. 



Marine: Samoa (Atl.). 



Var. perpiusilla Cl. — L. 0,04; B. 0,ois; at the constriction 0,oi2 mm. CostcB 8 in O.oi mm. 

 - A. S. Atl. XII f. 72. 



Marine: North Sea (Atl.). 



Var.? confecta A. S. (1875). — V. small. L. 0,04; B. 0,009; at the constriction 0,oo75 mm. 

 LnnulcB very large. Costse 9 in 0, 01 mm. — Nav. confecta A. S. Atl. XII f. 46. 



Marine: Campeachy Bay (Atl.). 



Var.? BirJiombus A. S. (1875). — V. strongly constricted, witli subrhomboid segments. 

 L. 0,07 6 to 0,13; B. 0,024 to 0,038; at the constriction 0,012 to 0,oi5 mm. Lunulse large. lunate. 

 Costa; 4 to 6 in 0,oi mm Ocelli not distinct. — Nav. Dirh. A. S. Atl. XI f. 21, 22; LXIX f. 9 

 (10 corroded). 



Marine: Gulf of Mexico (Atl.), Pelew Island (Atl.). 



The connection of this form with the others is not certain, as the ligures in Atl. do not 

 shew the marginal row of ocelli. It seems as if this form were to var. multicostata wliat var. 

 suspecta is to var. separahili.^i. Dipl. coarcfafa may be a corroded DirJioiiiltMS. which however 

 am iinable to decide, not having had an opportunity of comparing specimens. 



79. D. Mseriata Cl. N. Sp. — Y. elliptical or slightly constricted. L. 0,n to 0,13: B. 

 0,04 7 to 0,0 6 mm. Central nodule large, quadrate, its horns almost parallel. Furrows linear. 



