KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 27. N:0 3. 153 



Pl. LXII f. 388. v. H. Syn. p. 70 Pl. IV f. 18. A. S. Atl. CLXXXV, 5 to 8. M. antiqua Schum. 

 Preuss. D. Pl. IX f. 58 a (1862). 



Brackish, or almost fresh water: Sweden (Gothland) ! England! Belgium (V. H.), Saxony! 

 Tasmania! Australia (Atl.). 



Var. punctata Cl. — Linear, with cuneate ends. L. 0,04 to 0,065; B. 0,oi to 0,oi2 mm. 

 Striai 15 in 0,oi mm.; puncta 16 in 0,oi mm. 



Almost fresh water: Australia (Mitchell River)! Grothland! 



39. M. lanceolatii Thwaites (1848 fide W. Sm.). — V. lanceolate, frequently acuminate. 

 L. 0,04 to 0,05; B. 0,017 to 0,019 mm. Central area not distinct. Median line slightly undnlating. 

 Loculi 9 to 10 in 0, 01 mm. rectangular, of equal size, forming bands ending near the extremities. 

 Strise about 19 in 0, 01 mm. parallel, convergent at the ends, punctate; puncta 25 in 0, 01 mm. 

 forming longitudinal rows. — W. Sm. B. D. II p. 64 Pl. LIV f. 340. Grun. Casp. Sea Alg. p. 14 

 Pl. Ill f. 11. V. H. Syn. p. 70 Pl. IV f. 15 to 17. A. S. Atl. CLXXXVI, 21, 22. 



Brackish and marine: Baltic (Rtigen)! Caspian Sea (Grun.), England! Adriatie Sea! Labuan! 

 Port Jackson! Pensacola! 



40. M. fallax Cl. N. Sp. — V. lanceolate, slightly rostrate. L. 0,045 to 0,047; B. 0,oi8 

 mm. Median line slightly undnlating. Axial area indistinct. Central area small. Loculi 10 in 

 0.0 1 mm. forming a marginal band ending near the extremities. Strite 16 in 0, 01 mm., radiate 

 throughout, the median shorter, composed of elongated puncta forming longitudinal rows, closer at 

 the margins. — Pl. II f. 16. 



Marine: Seychelles (V. fl. Coll.)! Java! 



This species resenibles M. lanceolata, but its striae are radiate throughout and have a difFe- 

 rent punctation. In outline it resembles Grunow's Bhaphoneis diihia (Novara p. 99 Pl. 1 A f. 6) 

 which seems to be a Mastogloia, but has coarser strice than M. fallax. 



41. M. laniinaris Ehb. (1843). — V. lanceolate, frequently slightly acuminate. L. 0,03 to 

 0,05; B. 0,01 to 0,015 mm. Median line very slightly undnlating or straight. Central area not 

 distinct. Loculi 4 to 5 in 0, 01 mm. of equal size, forming bands ending near the extremities. 

 Stricfi about 21 in 0,oi mm., almost parallel, very finely punctate. — Ceratoneis lamin. Ehb. Am. 

 Pl. IIL 7 f. 24 (fide Grun.). Cl. Vega p. 494. Cl. M. D. N:o 153. 



Mai'ine: Adriatie! Corsica! Labuan! Java! Pensacola (Grove Coll.)! 



Var. intermedia Cl. — L. 0,035; B. 0,oi5 mm. Loculi 8 in 0, 01 mm. Strise 21 inO,oi mm. 

 — Pl. II f. 10. 



Marine: Japan! 



M. laminaris resembles M. lanceolata, but has larger loculi and finer striiB. The var. inter- 

 media takes an intermediate position. 



42. M. Portierana Grun. (1863). — V. lanceolate, slightly rostrate. L. 0,095; B. 0,027 

 mm. Loculi 7 in 0, 01 mm. equal, forming a band reaching to the apices. Strige fine, more than 22 

 in 0,01 mm. finely punctate. — Verh. 1863 p. 157 Pl. IV f. 3. 



Marine: Red Sea (Grun.). 



Unknown to me, seems to be allied to M. lanceolata or laminaris. 



43. M. pulcLella Cl. N. Sp. — V. rhomboid, acute. L. 0,i; B. 0,o28 mm. Median line 

 undnlating. Axial area indistinct; central area small, irregular. Loculi quadrate, 8 in 0,oi mm. 

 forming a marginal band reaching to the ends. Strise 14 in 0,oi mm. finely punctate, crossed by 

 several faint longitudinal lines. — Pl. II f. 27, 28, 29. 



Marine: Java. 



K. Sv. Vet. Akad. Handl. Band 27. N:o 3. 20 



