148 P. T. CLEVE, SYNOPSIS OF THE NAVICULOID DIATOMS. 



12. O. (Stictoneis) binotata Grdn. (1863). — V. elliptical. L. 0,033; B. 0,022 mm. Locu- 

 lus single in the middle of one of the margins (entire frustules shew one loculns on each side), 

 large with convex interiör margin. Central area transversely dilated to a short pseudostanros. 

 Strise 13 in 0, 01 mm., radiate near the ends, pnnctate; puncta about 11 in 0, 01 mm. forming curved, 

 oblique rows. — Cocconeis Scutellmn y Roper M. J. VI p. 24 Pl. III f. 9. Cocc. hinotata Geun. 

 Verh. 1863 p. 145 Pl. IV f. 13 a, h. Orthon. Unot. Grun. Novara p. 15. V. H. Syn. Pl. XXVIII f. 7. 



Marine: England! France! Mediterranean Sea! Adriatic Sea! Red Sea (Grun.), Nicobar 

 Islands (Grun.), Island of Rhea! Australia! Cape Good Hope (Grun.), West Indies! 



Var. atlantica Grun. — V. elliptical to elliptic-laneeolate. Loculi elongated. Strise finer. 

 — Novara p. 15 Pl. I f. 11. 



Marine: Atlantic, Honduras (Grun.). 



On living specimens a long horn of mucoid substance projects from the locultis. 



13. O. (Stictoneis) Crncicula Grun. (1877). — V. elliptical. L. 0,oi4 to 0,017; B. 0,oo8 

 to 0,01 mm. Loculi along the whole margin, 4 on each side, with invard margins convex. Central 

 nodule transversely dilated into a stauros. Strise 22 in 0, 01 mm., siightly radiate, finely punctate 

 (puncta in decussating lines?) — M. J. 1877 p. 177 Pl. CXCV f. 8. 



Marine: Honduras, Adriatic (Grun.). 



14. 0. (Stictoneis) flnibriata Btw. (1859). — V. elliptical. L. 0,02 to 0,05; B. 0,oi7 to 

 0,033 mm. Loculi large, 3 to 6 on each side, with interiör margin convex. Strite 7 to 8 in 0, 01 

 mm. coarsely pnnctate; puncta 7 to 8 in 0,oi mm. forming oblique and curved lines. The rows of 

 puncta end near the margin in double rows of small puncta. — Coccon. fimhr. M. J. VII p. 179 

 Pl. IX f. 13. Mastogloia crihrosa Grun. Verh. 1860 p. 577 Pl. VII f. 10 d. 



Marine: Mediterranean and Adriatic Sea! Mauritius! Madagascar! Sumbava! Japan! China! 

 Australia! Oceania! Honduras and Brazil (Grun.). 



15. O. Clevei Grun. (1880). — V. elliptical. L. 0,o46; B. 0,o3 mm. Loculi 2,5 in 0,oi 

 mm. narrower outwards. Strite 8 in 0, 01 mm. of large puncta, about 8 in 0, 01 mm. forming 

 oblique rows. The strite end at the margin in double rows of small puncta. — V. H. Syn. 

 Pl. XXVIII f. 4. 



Marine: Mauritius! Seychelles! Java! Barbados (Grun.). 



Resembles O. fimhriata, but has shorter, more numeroiis loculi, which become narrow ontward. 



16. O, splendida Greg. (1857). — V. elliptical. L. 0,o7 to 0,17; B. 0,o.'>-2 to 0,13 mm. 

 Loculi 2 to 3 in 0,ui mm., narrowed outwards. Their inner margin straight. The ends of the 

 median line curved in the same direction. Strise 5 to 6 in 0, 01 mm. slightly radiate, composed 

 of large puncta, forming elegantly curved and decussating rows, 4 to 5 in 0, 01 mm., ending near 

 the margin in double rows of small puncta. — Cocc. splcndida Greg. D. of Clyde p. 493 Pl. IX 

 f. 29. Cocc. punctatinmna Grev. M. J. V p. 8 Pl. Ill f. 1 (1857). M. crihrosa Grun. Verh. 1860 

 p. 577 Pl. VII f. 10 «. Orthon. splcnd. Grun. Novara p. 15 (1867). V. H. Syn. Pl. XXVIII f. 1, 2. 

 Truan a. WiTT D. of Jeremie Pl. IV f. 13. Pant. II Pl. XXIV f. 352. 



Marine: Scotland (Greg.), Bohuslän! Mediterranean Sea! Adriatic! Red Sea! Seychelles! 

 Madagascar! Sumatra! China! Japan! Oceania! Galapagos Islands! Honduras (Rabh.), Colon! West 

 Indies! Fo.ssil: Hungary! Moravia! Nankoori! ("alifornia! Jeremie (Truan a. Witt), Oamaru! 



Widely distributcd and easily recognized species. Fossil specimens from Moravia and Hun- 

 gary attain a gigantic size. 



17. O. Wrightii 0'Meaka (1867). — V. broadly elliptical. L. 0,027 to 0,034; B. 0,018 to 

 0,02.') mm. Median line straight, not reaching to the margin and enclosed between two i'ows of puncta, 

 12 ti) ]•'> ill 0,111 iniii. Loculi s in (),im nini. ecjual, quadrate, forming a marginal rim. Puncta of 



