KONGL. SV. VET. AKADEMIENS HANDLINGAK. HAND 27. N:() 3. 1 f 1 1 



87. M. serijita Cl. a. Grove (1891). — V. hroadl^y lanceolate, aeuminate. L (),ii(i; H. (),(i.!r, 

 mm. Median line undnlate. Central area small, nmnded. Locnli 4 in (I,(m mm. eqnal, quadrate, 

 forming a band reaching to the ends. Surface of the valve with 5 to (! .shallow, longitudinal 



.furrows on each side of the median line. Striae Ki in 0,01 mm., radiate throughout, in the middle 

 alternately longer and shorter, finely punctate. — Diatomiste I p. (ifi 1*1. X f (». 



Marine: Macassar Straits (Grove Coll.)! 



All these species from M. Leudugcri are intimately connected. M. seriafa combines them 

 with il/. f/uinquecostata var. rhombico 



88. M. quiuqiiecostata Grun. (1860). — V. elliptical to subrhoraboid. L. 0,(157 to 0,104; 

 B. 0,()2'i to 0,03 mm. Median line more or less undulate. Central area small. Loculi 4 to ') in 

 0,01 mm. almost equal, forming a band reaching nearly to the ends. Striaj 16 in 0,o 1 mm., 

 slightly radiate, finely punctate; puncta forming close, undulate, longitudinal rows. Striae crossed 

 on each side of the median line by 2 or 3 longitudinal, narrow depressions. — Verb. 1860 p. 578 

 PI. Vn f. 8. Hantzsch D. 0.stind. Arch. p. 20 f. 6. Perag. D. Villefranche PI. Ill f. 21. Nadc. 

 oUvacea Leud. Fortm. D. Ceylan p. 32 PI. II f. 23 (1879). Mast, ohscura Leud. Fortm. 1. c. p. 36 

 PI. Ill f. 33 (1879). Navic. Eneria Pant. Ill PL XLII f. 578 (1893)? Ma^f. Grunowii A. S. Atl. 

 CLXXXVI f. 1 to 7. 



Marine: Mediterranean and Adriatic Seas! Cape of Good Hope! Kerguelen's Land (Castr.), 

 Sumbava! Java! Samoa! 



Var. Jcerguelcnsis Castr. (1886). — Elliptical. L. 0,o3 to 0,045; B. 0,oi8 mm. Loculi 5 in 

 0,01 mm. Stria; 27 in 0,oi mm. — M. kerg. Castr. Voyage Challenger D. p. 22 PI. XV f. 11. 



Marine: Labuan! Upolu (Grun.), Kerguelen's Land (Castr.). 



Var. coHcinna A. S. (1893). — V. almost rhomboid. L. 0,05; B. 0,022 mm. Loculi some- 

 what unequal, forming an undulate band along the margin. Striae 22 to 23 in 0,oi mm. — M. 

 com. A. S. Atl. CLXXXVI f. 9. 



Marine: Corsica! Pithy usian Islands! Samoa! 



Var. elongata Leud. Fortm. (1879). — V. narrow, rhombic-lanceolate. L. 0,10.5 to 0, 111; 

 B. 0,03 mm. Striae 15 in 0,oi mm. Puncta about 19 in 0,oi mm. forming longitudinal rows. — 

 M. ('long. Leud. Fortm. D. Ceylan p. 35 PI. Ill f. 31. A. S. Atl. CLXXXVI f. 12. 



Marine: Madagascar (Van Heurck Coll.)! Ceylon (Leud. Fortm.). 



Var. rhomhica Cl. — A", rhomboid. L. 0,o7 2; B. 0,o36 mm. Median line slightly undulate. 

 Central nodule very small. Loculi 3,.5 to 4 in 0,oi mm. Strite 15 in 0,oi mm., slightly radiate, 

 stronger at the margin, fainter inwards, crossed by about 4 longitudinal shallow depressions, 

 punctate; puncta about 20 in O.oi mm. 



Marine: Ceylon! Madagascar! 



M. quinquecostata is a very variable species, closely connected with all the above forms from 

 31. cruciata. More or less connected with 31. quinquecostata are 31. quinquecostata var. neapolitana 

 Brun (A. S. Atl. CLXXXVI f. 10), M. sinuata A. S. (1. c. f. 11), 3£. mouritiana Brun (A. S. 

 Atl. 1. c. f. 28), 31. sansiharica A. S. (1. c. CLXXXVII f. 44), all forms, of which I have had 

 no opportunity of examining original specimens. 



Additional. 



M. Brunii A. S. (1893) — appears to be allied with 31. fallax — Atl. CLXXXVIII f. 27. 



31. chersonensis A. S. (1893) — seems to be related to 31. elcgans, but the figure is in- 

 sufficient for identification. — Atl. CLXXXVI f. 31, 32. 



31. (Urergcvs A. S. (1893) — a characteristic form, which however I cannot class in the 

 system as the figure is not sufficient. — Atl. CLXXXVII f. 52. 



K. Sv. Vet. .4kad. Handl. Band 37. N;o 3. 21 



