7(5. I 



\ • — rhombic-lanceolate to rhomboid 77. 



Pancta and stria equidistant M. Lenniisrota Leud. Fortm. 



— more distant than the striae M. javanica Cl. 



_,, I Valve elliptical to lanceolate 79. 



_„ J Striae 10 in 0,oi mm M. Tcmpcrei Cl. 



146 p. T. OLEVE, SYNOPSIS OF THE NAVICULOID BT ATOMS 



Valve broadlj' lanceolate, acuminate M. obesa Cr, 



— rhombic-lanceolate 80, 



I Strii 



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



J Puncta in the longitudinal rows largest in the middle M. Craveni Leud. Fortm. 



' \ — — — — of equal size A[. Leudiigeri Cl. a. Grove. 



1. M. tJrevillei W. Sm. (185(i). — V. linear, with ciineate, obtuse ends. L. 0,035 to 0,o6; 

 B. 0,0 1 to 0,0 12 mm. Central area rounded. Axial area narrow, linear. Median line flexuose. 

 Loculi (i to 7 in 0,oi mm. forming a band ending near the cuneate extremities. Costie 10 in 0,oi 

 mm., very slightly radiate, alternating with double rows of puncta arranged in obli(jue lines, 

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



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



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

 Gallen (Atl.). 



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



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

 L. 0,06.5; B. 0,02 1 mm. Axial area very narrow, lanceolate. Loculi(?) along the whole margin, 

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

 costte, G to 7,.'i in 0,oi mm., alternating with double rows of small puncta, arranged in decussating 

 lines. Connecting zone with two longitudinal rows of coarse puncta. — Alhnoncis Casfr. Pant. TI 

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



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



I have not examined this remarkable species, which I have placed provisionally in ]\Fasfo- 

 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. delicatiila Cl. (1893). — V. lanceolate, acuminate. L. 0,037; B. 0,014 mm. Median 

 line slightly flexuose. Areas indistinct. Loculi quadrate, (> in 0,oi mm., equal, forming a marginal 

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

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



Marine: Bahamas (Grove Coll.)! 



4. M. Rhombus Petit (1867). — V. broadly lanceolate, acuminate. L. 0,o4G to 0,o.58; 



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

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

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

 f. 12. 3[asto(,. m. Cl. and Grove Diatomiste I p. 58 PI. IX f. 12. A. S. Atl. CLXXXVIL. 

 33 to 35. 



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

 (Tlium.)! (,'ampeachy Bay! 



5. M. asperiila (tRIin. (1892). — V. elliptical or lanceolate, with acuminate, rostrate or 

 subcapitate ends. Ij. 0,o3 to 0,0.5; B. 0,o23 to 0,027 mm. Median line straight. No axial area. 

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

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

 in obliquely decussating rows. — Cl. Diatomiste I p. 161 PI. XXIII f. 12. M. I'liaiUdna 

 (instead of Ihaifiana Castr.) A. S. Atl. CLXXXVIT, 46, 47 (variety?). 



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



