56 p. T. CLEVE, SYNOPSIS OF THE NAVICULOID DIATOMS. 



Var. perlonga Pant. (1889). — V. slightly gibbons in the middle. L. 0,4 to 0,5; B. O.oo.'i 

 mm. Strise 10 in 0,oi mm. — Nav. perlonga Pant. 11 p. r)2; 111 PI. XIV f. 209. 



Marine : Hungary, fossil (Pant.). 



Var. sahdlix>tica Cl. — V. linear-elliptical, frequently with snbrostrate ends. L. 0,15 to 

 0,19; B. 0,0.37 to 0,04 mm. Areas broader. Striae 11 to 12 in 0,oi mm. — A. S. Atl. L. 4, 5. 



Marine: Raised Marsh (Atl.), Redondo and Santa Monica Calif., fo.ssil (Deby Coll.)! Porto 

 Seguro (Deby Coll.)! 



This large and beautiful form is nearly connected witli C. Liber and may be regarded 

 as one of its many varieties. 



20. C. probabilis A. S. (1877). — V. linear with subcuneate ends. L. 0,n; to 0,i8; 

 B. 0,028 to 0,03 mm. Axial area narrow. Central area small, subrhomboid. Median line slightly 

 flexuose. Strite 10 in 0,oi mm. Longitudinal lines double. — Nar. proh. A. S. Atl. L. f. 46. 



Marine: Campeachy Bay (Atl.), Florida; Java (Glrove Coll.)! 

 Also nearly akin to C. liber (var. bieuneata). 



21. C. Eugeniae Cl. (1881). — V. linear, with rounded ends, very convex. L. 0,o75 to 0,085; 

 B. 0,017 mm. Axial area indistinct. Central area small, rhombic-orbicular. Median line slightly 

 sinuo.se. Strise 7 to 9 in 0,oi mm., slightly radiate in the middle, somewhat convergent at the 

 ends, not distinctly punctate. Longitudinal lines distinct, submarginal. — Nav. Em/. Cl. N. R. 

 D. p. 7 PI. II f 16. 



Marino: Galapagos Islands! 



22. C. virgiliea Cl. (1878). — V. lanceolate with acute or subrostrate and obtuse ends. 

 L. 0,o.')8 to 0,09; B. 0,02 7 to 0,025 mm. Axial area very narrow, slightl_y dilated nnilateralty at 

 the central nodule. Central pores approximate. Strict 20 to 21 in 0,oi mm. parallel. Longi- 

 tudinal lines faint, submarginal. — Nav. virg. Cl. West liid. D. p. 5 PI. 1 f. 2. Nar. paralUla 

 Castr. Voy. Challenger p. 31 PI. XXVIII f. 12 (1886)? 



Marine: West Indies, Virgin Islands! Bahamas (Grrove Coll.)! 



23. C. Pximia Grun. Ms. — V. divided by two deep constrictions into three segments of 

 equal size. L. 0,ii to 0,12; B. 0,025 mm. Axial area narrow. Central area small, orbicular. 

 Striae 14 in 0,oi mm. radiate in the middle. Longitudinal lines double; the exterior sti'onger — 

 PI. IV f. 2. 



Marine: Seychelles (Van Heurck Coll.)! Cebu (Grove Coll.)! 



24. C. clavigera Cl. N. Sp. — V. elongated, divided by two slight constrictions into one 

 smaller median, and two larger terminal, segments. L. 0,115; B. ,Ooi5 (max.) mm. Axial area 

 narrow. Central area a broad fascia. Strise 20 in 0,01 mm., parallel, divergent at the ends. 

 Longitudinal lines median. — PI. IV f. 3. 



Marine: Colon (Deby Coll.)! 



This form may be regarded as a variety of N. Liher, with transverse fascia. 



25. C. (Pleurosigina) staurophora Grun. (1880). — V. sigmoid, lanceolate, gradually 

 tapering from the middle to the acute ends. L. 0,1125; B. 0,oi4 mm. Median line central, 

 sigmoid. (Central area a broad, transverse fascia, reaching the] margins. Striie 14 in 0,oi mm. 

 parallel, not punctate. Longitudinal lines closer to the median line than to the margin. Inside the 

 longitudinal lines the strise are fainter tlian outside. — Pletirosi/jn/a stdurophorvni Grun. A. D. 

 p. 61. Perag. VIII f 45. 



Marine: Davis Strait (Grun.) 



Var. a.^iafica Temp. a. Brun (1889) — L. 0,i9 to 0,22; B. 0,025 to 0,o28 mm. Striai 16 to 

 18 in 0,01 mm. ~ Fleur. a.naHcum D. f. du dapon j). 5() PI. IX f. 1. Perag. VIII f. 44. 

 Marine: Japan, fossil. 



