146 p. T. CLEVE, SYNOPSIS OF THE NAVICULOID DTATOMS 



I 



\ — more distant than the strise . M. javanica Cl 



_P I Valve broadly lanceolate, acuminate M. obesa Cl. 



\ — rhombic-lanceolate to rhomboid 77. 



„_ ) Pnncta and striae equidistant M. Lemniscata Leud. Fortm. 



„„ f Valve elliptical to lanceolate 79. 



( Valvi 



I — rhombic-lanceolate 80. 



J Strise 10 in 0,01 mm •, • • ■ -^^ Temperei Cl. 



' \ — 14 to If) in 0,01 mm. . . M. Kelleri Pant. 



{Pnncta in the longitudinal rows largest in the middle M. Craveni Leud. Fobtm. 

 — — — — of equal size M. Leudugeri Cl. a. Geove. 



1. Iff. Grevillei W. Sm. (1856).^ — V. linear, with cuneate, obtuse ends. L. 0,o35 to 0,o6; 

 B. 0,01 to 0,012 mm. Central area rounded. Axial area narrow, linear. Median line flexuose. 

 Loculi 6 to 7 in 0,oi mm. forming a band ending near the cuneate extremities. Costje 10 in 0,oi 

 mm., very slightly radiate, alternating with double rows of puncta arranged in oblique lines, 

 about 20 in 0,oi mm. — W. Sm. B. D. II p. 65 PL LXII f. 389. V. H. Syn. p. 71 PI. IV f. 20. 



A. S. Atl. CLXXXV, 1, 2. 



Fresh or slightly brackish water: Pentland Hills (Grove Coll.)! Belgium (V. H.), S:t 

 (fallen (Atl.). 



This species resembles M. elliptica var. Dansei but has a different structure of the valve. 



2. M. Castracanei Pant. (1889). — V. elliptic-lanceolate, with very slightly rostrate ends. 

 L. 0,065; B. 0,021 mm. Axial area very narrow, lanceolate. Loculi(?) along the whole margin, 

 alternately larger and smaller, the former 3 in 0,oi mm. Structure: transverse, slightly radiate 

 costse, 6 to 7,5 in 0,oi mm., alternating with double rows of small puncta, arranged in decussating 

 lines. Connecting zone with two longitudinal rows of coarse puncta. — Alloioneis Castr. Pant. II 

 PL XXIII f. 344, III PL XXV f. 374. M. Castr. A. S. Atl. CLXXXVIII, 30. 



Marine: Bory, Karand Hungary, fossil (Pant.). 



I have not examined this remarkable species, which I have placed provisionally in Masto- 

 gloia, as the figure in the zonal view shews something, which appears to be loculi. The structure 

 of the valve resembles that of M. Grevillei. 



3. M. delicatula Cl. (1893). — V. lanceolate, acuminate. L. 0,037; B. 0,oi4 mm. Median 

 line slightly flexuose. Areas indistinct. Loculi quadrate, 6 in 0,oi ram., equal, forming a marginal 

 band, reaching nearly to the ends. Striae 21 in 0,oi mm. parallel, formed of puncta arranged in 

 decussating rows. — Cl. Diatomiste Vol. II p. 16 PL I f. 20. 



Marine: Bahamas (Grove Coll.)! 



4. M. Rhombus Petit (1867). — V. broadly lanceolate, acuminate. L. 0,o46 to 0,o58; 



B. 0,025 to 0,035 mm. Loculi with convex inner margin, 3 to 4 in 0,oi mm., equal, forming a 

 row along the whole margin of the valve. Strise 13 in 0,oi mm. composed of elongated puncta, 

 forming decussating rows, about 9 in 0,oi mm. — Nav. Rhombus Petit D. Campbell p. 23 PL IV 

 f. 12. Mastog. Eh. Cl. and Grove Diatomiste I p. 58 PL IX f. 12. A. S. Atl. CLXXXVII, 

 33 to 35. 



Marine: Nossibe (Brun Coll.)! Manilla (Deby Coll.)! Macassar Straits (Grove Coll.)! China 

 (Thum.)! Campeachy Bay! 



5. M. asperula Gkun. (1892). — V. elliptical or lanceolate, with acuminate, rostrate or 

 subcapitate ends. L. 0,o3 to 0,05; B. 0,o23 to 0,o27 mm. Median line straight. No axial area. 

 Central area small, rounded. Loculi equal, quadrate, 4 in 0,oi mm. forming a band reaching to 

 the ends. Strise 13 in 0,oi mm. parallel, slightly radiate at the ends, of elongated alveoli, arranged 

 in obliquely decussating rows. — Cl. Diatomiste I p. 161 PL XXIII f. 12. M. Phaitiana 

 (instead of thaitiana Castr.) A. S. Atl. CLXXXVII, 46, 47 (variety?). 



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



