56 P. T. CLEVE, SYNOPSIS OF THE XAVICULOID DIATOMS. 



Var. perlonga Pant. (1889). — V. sliglitly gibbous in the middle. L. 0,4 to O,.-;; B. O.oon 

 mm. Strise 10 in 0,oi mm. — Nav. perlonga Pant. IT p. 52; III Pl. XIV f. 209. 



Marine: Hiuigary, fossil (Pant.). 



Var. siihdliptiea Cl. — V. linear-elliptical, frequently with subrostrate ends. L. 0,1.1 to 

 0,19; B. 0,0:57 to 0,04 mm. Areas broader. Stritu 11 to 12 in 0,oi mm. — A. S. Atl. L. 4, 5. 



Marine: Raised Marsh (Atl.), Redondo and Santa Monica Calif., fossil (DebyCoU.)! Porto 

 Seguro (Deby Coll.)! 



This large and beautiful form is nearly connected with C. Liher and may be regarded 

 as one of its many varieties. 



20. C. probabilis A. S. (1877). — V. linear with subcnneate ends. L. O, ig to 0,is; 

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

 fiexnose. Strite 10 in (),oi mm. Longitndinal lines double. — Nav. proh. A. S. Atl. L. f. 46. 



Marine: Campeaehy Bay (Atl.), Florida; Java (Grrove Coll.)! 

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



21. C. Eiigeniae Cl. (1881). — V. linear, with rounded ends, very convex. L. 0,o75 to0,o85; 

 B. 0,0 17 mm. Axial area indistinct. Central area small, rhombic-orbicular. Median line slightly 

 sinuose. Stria; 7 to 9 in 0,oi mm., slightly radiate in the middle. somewhat convergent at the 

 ends, not distinctly punctate. Longitndinal lines distinct, sulsmarginal. — Nav. Eng. Cl. X. R. 

 D. p. 7 Pl. II f. 16. 



Marino: Galapagos Islands! 



22. C. virginea Cl. (1878). — V. lanceolate with acnte or subro.strate and obtuse ends. 

 L. 0,058 to 0,09; B. 0, 027 to 0,025 mm. Axial area very narrow, slightl,y dilated unilaterally at 

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

 tvidinal lines faint, si^bmargiiial. — Nav. virg. Cl. We.st Ind. D. p. 5 Pl. I f. 2. Nar. paraUda 

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



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



23. C. eximia G-run. Ms. — V. divided by two deep constrictions into three segments of 

 eqnal size. L. 0, 11 to 0,12; B. 0,025 mm. Axial area narrow. Central area small, orbicular. 

 Strise 14 in 0,oi mm. radiate in the middle. Longitndinal lines donble; the exteriör stronger — 

 Pl. IV f. 2. 



Marine: Seychelles (Van Henrck Coll.)! Cebn (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. ,0oi5 (max.) mm. Axial area 

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

 Longitndinal lines median. — Pl. IV f. 3. 



Marine: Colon (Deby Coll.)! 



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



25. C. (Pleurosigina) stanrophora Grun. (1880). — V. sigmoid. lanceolate. gradnally 

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

 sigmoid. Central area a broad, transverse fascia, reaching the] margins. Stria^ 14 in O.oi mm. 

 parallel, not pnnctate. Longitndinal lines closer to the median line than to the margin. Inside the 

 longitndinal lines the stria^ are fainter than outside. — Pleuro-iigiiia ■■^faiiro2)/iuruiit (tRI"N. A. D. 

 p. 61. Perag. VIII f. 45. 



Marine: Davis Strait (Grun.) 



Var. asiatica Temp. a. Brun (1889) — L. 0,iy to 0,22; B. 0,025 to 0,o28 mm. Strite 16 to 

 18 in 0,01 mm. — Pleur. asiaticum D. f. dn Japon p. 56 Pl. IX f. 1. Perag. VIII f. 44. 

 Marine: Japan, fossil. 



