KONGL. SV. VET. AKADEMIENS HANDLINGAU. HAND 27. N:() 3. 1,53 



PI. LXII f. 388. V. H. Syn. p. 70 PI. IV f. 18. A. S. Ail. CLXXXV, 5 to 8. M. antigua Schum. 

 Prens.s. D. PI. IX f. 58 a (18()2). 



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

 Tasmania! Australia (Atl.). 



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

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



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



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

 L. 0,04 to 0,05; B. 0,0 17 to 0,019 mm. Central area not distinct. Median line slightly undulating. 

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

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

 forming longitudinal rows. — W. Sm. B. D. II p. (54 PI. LIV f. 340. Grun. Casp. Sea Alg. p. 14 

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



Brackish and marine: Baltic (Rligen)! Caspian Sea (Grun.), England! Adriatic Sea! Labuan! 

 Port Jackson! Pensacola! 



40. M. fjillax Cl. N. Sp. — V. lanceolate, slightly rostrate. L. 0,o45 to 0,047; B. 0,oi8 

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

 0.01 mm. forming a marginal band ending near the extremities. Striffi 16 in 0,oi mm., radiate 

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

 the margins. — PI. II f. 16. 



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



This species resembles M. lanceolata, but its striee are radiate throughout and have a diffe- 

 rent punctation. In outline it resembles Grunow's Rhaphoneis dtihia (Novara p. 99 PI. 1 A f. 6) 

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



41. M. laminaris Ehb. (1843). — V. lanceolate, frequently slightly acuminate. L. 0,o3 to 

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

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

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

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



Marine: Adriatic! Corsica! Labuan! Java! Pensacola (Grove Coll.)! 



Var. intermedia Cl. — L. 0,o3.^; B. 0,oi5 mm. Loculi 8 in 0,oi mm. Strise 21 in 0,oi mm. 



— p;. II f. 10. 



Marine: Japan! 



M. laminaris resembles M. lanceolata, but has larger loculi and finer striee. 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,oi mm. equal, forming a band reaching to the apices. Striai fine, more than 22 

 in 0,0 1 mm. finely punctate. — Verb. 1863 p. 157 PI. IV f. 3. 



Marine: Red Sea (Grun.). 



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



43. M. piilcliella Cl. N. Sp. — V. rhomboid, acute. L. 0,i; B. 0,028 mm. Median line 

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

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

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



Marine: Java. 



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



