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



Vai'. Fitella A. S. (1875). — L. O.obsg to O.ior.; B. O.oigr to O.oar,; at the constrict. 0,0075 

 to 0,0 ir, mm. Transverse costtf (! to 9 in 0,0 1 mm.; loiigitiulinal 2 to 3 on pacli side of tbe mpdian 

 line, less distinct. — Nav. Fuelln A. S. Atl. XII f. 13; LXIX f. 15. Nar. rxewta A. S. N. S. D. 

 p. 85. Pl. II f. 5 (1874). Atl. LXIX f. 13. 



Marine: North Sea (A. S.); Sorrento (Atl), Campeachy Bay (Atl.), California (Atl.). 



Under the name Xav. Pitrlla A. Schmidt seems to have coiifoniided different forms. The 

 fig.s. 14 and 15 Pl. XII probably do not represent the same form as tlie fig. 13. The fig. 13, which 

 I regard as the most typical, is evidently a small variety of I), tipleridhla. A. Schmidt seems also 

 to have denoted two dilFerent species as Nar. exmifa. 



Var. diplostida A. S. (1875). — With fine pimcta above the reticulation of the costte. — 

 Nav. fUplosticta A. S. Atl. XIII f. 25 to 30; LXIX f. 22, CLXXIV f. 10 (no pnnotation visible). 



Marine: Campeachy Bay (Atl.), Grulf of Mexico (Atl.), Java, Sfimoa (Atl.), Cape Horn (Petit). 



Var.? Huynaldii Pant. (1889). — V. slightly constricted. L. 0,o9i to 0,ir. ; B. 0,o28 to 0,04; 

 at the constr. 0, 027 to 0, 028 mm. Central nodnle quadrate, with parallel horns. Fnrrows narrow, 

 linear, with a row of puncta. Ti^ansverse costfe radiate at the ends, 8 to 10 in 0, 01 mm., crossed 

 on each side of the median line by about 8 longitudinal, slightly iindulating costte. — Nar. Hay- 

 naldi Pant. II p. 47 Pl. XXIV f. 361. 



Marine: Hungary, Bory, fossil! 



The fig. in Pantocsecs work is not very clear. The above description is from specimens 

 from Bory, which agree in all eventials with I), sph-udidfi, lieing only a little less constricted and 

 liaving finer structure than nsnal. 



Y a.r.? 2}>'oniiiiula A. S. (1875). — V. strongl_y constricted. L. 0,042; B. (.),oi9; at the constr. 

 0,0 13 mm. Transverse costse 8 in 0, 01 mm., crossed by some few longitiidinal costse. — Nar. pro- 

 mlnula A. S. Atl. XIII f. 15. 



Marine: Kings Mill Island (Atl.). 



This form reqnires a more accnrate examination l^efore its trne place in the .system can be 

 determined. 



Var.? élcsdiana Pant. (1886). — L. 0,o7 to 0,i; B. 0,026 to 0,03; at the constr. O.02 to 

 0,028 mm. Segments tongue-shaped. Transverse costcC 8 in 0, 01 mm.; longitudinal nnmerons, about 

 8 on each side of the median line. — Nar. cletid. Pant. I p. 42 Pl. XVII f. 152. 



Marine: Hungary, fossil (Pant.). Baltjik, fossil! Russia, fossil (Deby). 



Nav. Margarita A. S. (Atl. CLXXIV fig. 17) seems to be akin to var. élesdiana. I have 

 not seen any form exactly resemljling this, bnt I tliink it very probable, tliat tlie figured .specimen 

 woiild in another focns have very much the same appearauce as some of the numerous varieties 

 of D. splendida. 



37. D. Itomhoides A. S. (1874). — V. panduriform, with subelliptical to tongue-shaped 

 segments. L. 0, 09 to O, is; B. 0,o4 to 0,05s; at the constr. 0,03 to O.035 mm. Central nodule 

 strong, ijuadrate; its horns parallel. Furrows linear, somewhat dilated around the central nodule. 

 Transverse costre 6 to 7 in 0,oi mm, crossed by numerous slightly nndulating. longitudinal costa', 

 about 6 in 0,oi mm. — Nav. bomboides A. S. N. S. D. Pl. I f. 2. Atl. XIII f. 36. V. H. Svn. 

 Suppl. B f. 19. Nav. didyma W. Sm. B. D. XVII f. 154 a*. Nar. WiUiamsomi V. H. S'vn. 

 Pl. IX f. 3. 



Marine: North Sea! Alexandria (Debj^ Coll.)! Zanzibar (Atl.), Madagascar! Ceylon! Philip- 

 pines! Sydney! China! Japan! Galapagos Islands! Campeachy Bay! 



Var. madagaficarcnsis Cl. — V. short, slightly constricted, witli broad, tongue-shaped seg- 

 ments. L. 0,04 to 0,085; B. 0,022 to 0,043; at the constr. 0,02 to 0,03ö mm. Transverse costfe 7 

 to 9 in 0,01 mm., slightly radiate. Longitudinal costa? almost straight, curved outwards in the 

 middle of the valve. — A. S. Atl. LXIX f. 35 (small form). — Pl. T f. 22. 



Marine: Madagascar (Kinker a. Brun Coll.)! Cape Grood Hope (Atl.)! Manilla (Uebj- CoU.)! 



