146 P. T. OLEVE, SYNOPSIS OF THE NAVICULOID DTATOMS. 



( Valve broadly lanceolate, aonminate M. ohesa Cl. 



\ — rhoTcbic-lanceolate to rhomboid 77. 



__ / Pnncta and strije equidistant M. Lemniscafa Leud. Fortm. 



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



„ J Valve elliptical to lanceolate 79. 



— rhombic-lanceolate 80. 



j Striffl 10 in 0,oi mm M. Temjjerei Cl. 



} 



\ — — — — of eqnal size M. Leudngeri Cl. a. Grove. 



( Stria 

 Puncta in the longitudinal rows largest in the middle M. Craveni Leub. Foetm. 



^^ 14 to 15 in 0,01 mm . M. Kelleri Pant. 



80 



1. M. Grevillei "W". Sm. (1856). — V. linear, -with cuneate, obtuse ends. L. 0,o.3,'i to 0,06; 

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

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

 mm., very slightly radiate, alternating with double rows of pnncta arranged in obliqne lines, 

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



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



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

 Gallen (Atl.). 



This species resembles M. elliptica var. Bansei 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. Locxili(?) along the whole margin, 

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

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

 lines. Connecting zone with two longitudinal rows of coarse puncta. — Älloioneis Casfr. 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, whieh I have placed provisionally in Masfo- 

 gloia, as the iigure in the zonal view sliews 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. 0,03?; B. 0,oi4 mm. Median 

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

 band, reaching nearly to the ends. Strise 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. 0,046 to 0,or>8; 



B. 0,02.'') to 0,03.') mm. Loculi with convex inner margin, 3 to 4 in O, ni mm., equal, forming a 

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

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

 t 12. Ma.^itofi. Rh. Cl. and Grove Diatomiste I p. 58 Pl. IX f. 12. A. S. Atl. CLXXXVII, 

 33 to 35. 



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

 (Tlium.)! Campeachy Bay! 



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

 subcaintate ends. L. 0,o3 to 0,0.5; B. 0,023 to 0,027 mm. Median line straight. No axial area. 

 Central area small, rounded. Loculi equal, quadrate, 4 in 0, 01 mm. forming a band reaching to 

 the onds. Striie 13 in 0,oi mm. parallel, sliglitly radiate at the ends, of elongated alveoli, arranged 

 in (ililiiimdy decussating rows. — Cl. Diatomiste I p. 161 Pl. XXlll f. 12. ilf. Vliditunia 

 (iiisfciul of Ihaitiana Castr.) A. S. Atl. CLXXXVII, 46, 47 (variety?). 



Maiine: Baleai'ic Islands! Seyclielles (Vaii Heurck Coll.)! Java! Cehu (Grove Coll.)! 



