88 p. T. CLEVE, SYNOPSIS OF THE NAVICtTLOID DIATOMS. ■ 



Var. Fnella A. S. (l^<75). — L. 0,o636 to 0,io(;; B. 0,oi6(i to Coao; at the constrict. U,()07r> 

 to (),()iD ram. Transverse costce 6 to 9 in 0,oi mm.; longitudinal 2 to 3 on each side of the median 

 line, less distinct. — Nav. FncUa A. S. Atl. XTI f. 13; LXIX f. 15. Nar. exemfa A. S. N. S. D. 

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



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



Under the name Nav. Pudla A. Schmidt seems to have confounded different forms. The 

 figs. 14 and 15 PI. XII probably do not represent the same form as the fig. 13. The hg. 13, which 

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

 to have denoted two different species as Nov. excmta. 



Var. diplostida A. S. (1875). — "With fine puncta above the reticulation of the costtu. — 

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



Marine: Campeachy Bay (Atl.), Gulf of Mexico (Atl.), Java, Samoa (Atl.), Cape Horn (Petit). 



Var.? Hayiialdii Pant. (1889). •— V. slightly constricted. L. 0,o9i to 0,i.5; B. 0,o28 to 0,o4; 

 at the constr. 0,02 7 to 0,02 8 mm. Central nodule quadrate, with parallel horns. Furrows narrow, 

 linear, with a row of puncta. Transverse costse radiate at the ends, 8 to 10 in 0,01 mm., crossed 

 on each side of the median line by about 8 longitudinal, slightly undulating costic. — Nnv. Hay- 

 nukli Pant. II p. 47 PI. 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 M-ith 1). .splciulida, being only a little less constricted and 

 having finer structure than usual. 



Ya,r.? promimda A. S. (1875). — V. strongly constricted. L. 0,042; B. 0,0 1;*; at the constr. 

 0,0 13 mm. Transverse costse 8 in 0,oi mm., crossed by some few longitudinal costse. — Nav. ptro- 

 mnmla A. S. Atl. XIII f. 15. 



Marine: Kings Mill Island (Atl.). 



This form requires a more accurate examination l)efore its true place in the system can l)e 

 determined. 



Var.? ('-Icsdiana Pant. (1886). — L. 0,07 to 0,i ; B. 0,o26 to 0,03; at the constr. 0,02 to 

 0,028 mm. Segments tongue-shaped. Transverse costic 8 in 0,oi mm.; longitudinal numerous, about 

 8 on each side of the median line. — Nav. elcsd. Pant. I p. 42 PI. XVII f. 152. 



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



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

 not seen any form exactly' resembling this, but I think it very probable, that the figured specimen 

 would in another focus have very much the same appearance as some of the numerous varieties 

 of D. .splciididd. 



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

 segments. L. 0,o'.t to 0,i3; B. 0,04 to 0,05.f); at tlie constr. 0,o3 to 0,03:^ mm. Central nodule 

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

 Transverse costse G to 7 in 0,oi mm, crossed by numerous slightly undulating, longitudinal costrt, 

 about 6 in 0,o] mm. — Nav. bomboides A. S. N. S. D. PL I f. 2. Atl. XIII f. 36. V. H. Syn. 

 Suppl. B f. 19. Nav. didyma W. Sm. B. D. XVII f. 154 a*. Nav. WUliamsonii V. H. Syn. 

 PI. IX f. 3. 



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

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



Var. madafiascarensis Cl. — V. short, slightly constricted, with bi'oad, tongue-shaped seg- 

 ments. L. 0,04 to 0,085; B. 0,022 to 0,043; at the constr. 0,02 to 0,03.'5 mm. Transverse costa' 7 

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

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



Marine: Madagascar (Kiiiker a. Brun Coll.)! Cape Good Hope (Atl.)! Manilla (Deby Coll.)! 



