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



margin and with a linear marking on each side of the central nodule. Strise 4 in 0,oi mm., 

 slightly divergent in the middle and at the ends. — Nav. lohata Grove a. Stdrt J. Q. M. Cl. (2) 

 III p. 133 Pl. X f. 12. Nav. spatUfera Grove a. Stubt A. S. Atl. CLXXIV f. 23. 

 Marine: Oamaru Dept., New Zealand! San Pedro Dept. (Kinker Coll.)! 



79. P. constricta Cl. N. Sp. — V. small, constricted in the middle, with apiculate ends. 

 L. 0,035; B. 0,0 1 mm. (at the constr. 0,oo5 mm.). Terminal fissures small. Axial area narrow; 

 central a transverse, broad fascia. Strise 8 to 9 in 0,oi mm., parallel. — Pl. I f. 14. 



Marine: Galapagos Islands! 



80. P. Teniperei Brun (1889). — V. broad, with parallel or slightly concave margins, and 

 cuneate, obtnse ends. L. 0,i4 to 0,15; B. 0, 045 to 0, 055 mm. Median line with distant central 

 pores and small, hook-shaped, terminal fissures, bordered on each side by lines, divergent towards 

 the middle of the valve. Area wide, lanceolate, dilated aronnd the central nodule. StricE 7 to 

 8 in 0,01 mm. in the middle radiate, and sometimes alternately longer alid shorter, parallel at the 

 ends. — Nav. Teniperei Brdn Diat. dn Japon p. 45 Pl. V f. 1. - A. S. Atl. CLXXIV f. 24. 



Marine: Sendai Dept. Japan! 



81. P. Trevelyaii.1 Donk. (1861). — V. linear, slightly gibbous in the middle and at the 

 broad, roi^nded ends. L. 0, 1 to 0,15; B. 0, 02 to 0, 025 mm. Median line excentrio towards the ends 

 and somewhat flexnose, bordered on each side by a longitudinal line. Terminal fissures lai^ge, 

 hook-shaped. Axial area narrow, linear. Central area large, orbicular. Strise strongly radiate 

 in the middle and convergent at the ends, 10 in 0, 01 mm., crossed by a narrow depression. — 

 Nav. Trev. Donk. M. J. I (N. S.) p. 8 Pl. I f. 2. Br. D. p. 66 Pl. X f. 6. V. H. Syn. p. 74 

 Suppl. A f. 5, 6. Pinn. T. Pabh. E. A. p. 210. 



Marine: North Sea (Coasts of Sweden, England, Scotland, Belginm)! Florida (Pensacola)! Japan! 



Var. angusta Cl. — V. linear. L. 0,i to 0,i6; B. 0,oi to 0,oi.'> mm. Strise 9 to 10 in 0,01 

 mm. — Nar. Trev. var. hungarica Pant. III Pl. XLII f. 575 (1893)? 



Marine: Gulf of Naples! Sumatra (Deby Coll.)! Galapagos Islands! Bermudas (Rae Coll.)! 



Stauroneis Brébissonii Castr. (Chall. Voy. p. 24 Pl. XV f. 4) appears to be akin to P. Tre- 

 velyana. 



82. P. groenlandica Cl. (1881). — V. lanceolate, with rounded ends. L. 0,117; B. 0,023 

 mm. Median line central, angularly bent towards the central nodule. Terminal fissures hook- 

 shaped. Axial area narrow, linear; central area lax^ge, orbicular. Strise strongly radiate in the 

 middle, convergent towards the ends, 6 to 7,5 in 0, 01 mm., crossed by a narrow lateral area. — 

 Nav. groenl. Cl. N. R. D. p. 7 Pl. I f. 13. 



Marine: Davis Strait! 



83. P. rectangulata Greg. (1857). — V. linear, frequently slightly gibbous in the middle 

 and at the ends. L. 0,065 to 0,i; B. 0,oi5 to 0, 02 mm. Median line central, with strong, hook- 

 shaped terminal fissures. Axial area indistinct; central area large, rounded-quadrate. Stria? 

 strongly radiate in the middle, convergent at the ends, 8 to 10 in 0, 01 mm. — Nav. rect. Greh. 

 D. of Clyde p. 479 Pl. IX f. 7. Donk. B. D. p. 66 Pl. X f. 5. V. H. Syn. p. 74 Suppl. A f. 7. 

 Nav. Regula Grun. in Cl. D. West Ind. p. 5 Pl. I f. 3. Nav. lumen Perag. Villefr. p. 45 Pl. II 

 f. 19. Pinnul. rect. Rabh. E. A. p. 215. 



Marine: North Sea (Coasts of Sweden, Scotland, England, Belgium)! Mediterranean (Perag.), 

 Labuan! "West Indies! Campeachy Bay (Grun.). 



Forma .subundulata Grun. (1882). — V. with slightly undulate mai^gins. — Cl. M. D. N:o 301. 

 Marine: Firth of Tay! 



84. P. 8taiintonii Grun. (1882). - V. asymmetrical, linear, convex, .slightly gibbous in the 

 middle, with broad, rounded ends. L. 0,053; B. 0, 01 mm. Median line excentrit^ with hook-shaped 



