194 p. T. CLEVE, SYNOPSIS OF THE NAVICULOIl) DIATOMS, 



Var. Kurzii Grun. (1878). — V. rliombic-lanceolate, with rounded ends. L. 0,o9 to 0,10.--,; 

 B. 0,():3 6 mm. Median line strongly excentrie. Axial area semilanceolate, unilateral. Alveoli dis- 

 posed in oblicpie rows, crossing each other in an angle of about 80°, and about 7 in 0,()i mm. 

 Transverse costcB marginal, 10 — 11 in O.oi mm. — Nav. {AUoioneix':') Kurzii Grun. in CI. West 

 Ind. I), p. 8 PI. 11 f. 12. 



Brackish water: Elephant Point, India (Grun.), Singapore! Sumatra (Grove Coll.)! 



8. T. velata A. S. (1876). — V. lanceolate, gradually tapering to the obtuse ends. L. 0,o7 

 to 0,1.3; B. 0,02 to 0,022 mm. Axial area very narrow or unilateral; central area small, rounded. 

 Alveoli rectangular, disposed in irregular, oblique rows and in transverse rows; the latter almost 

 parallel or slightly radiate at the ends, 15 — 16 in 0,(ii mm. Fine longitudinal striie 25 in 0,oi 

 mm. — Nar. velata A. S. Atl. PI. XL VIII f. 33—34; f. 35—37 (no name). Nav. australis Petit 

 Cape Horn p. 125 (1888). 



Marine: Cape Good Hope (Atl.), Madagascar! Mauritius! Ceylon! King Georges Sound (Grove 

 Coll.)! Sumatra! Java! China! Japan! Sandwich Islands! New Caledonia! Cape Horn (Petit). 



Additional. 



Under the name Naricula Pain dinar urn Pantocsek has recently figured an apparentl^^ very 

 curious form, wliieh ought perhaps to be included in a proper genus. The valve is lanceolate, 

 obtuse. L. 0,115; B. 0,o38 mm. Axial area moderately broad, slightly dilated in the middle. 

 Sti'icB costate, 8 in 0,(»i mm., radiate throughout and alternating with single rows of large ocelli (?) 

 - PaxXT. hi pi. IX f. 144. Var. gracUior 1. c. PI. XI f. 186. Fresh water? Bodos» (Pant.). 



Having liad no opportunity of examining tliis remarkable form I am unable to decide as to 

 its place in the system. 



Mastoneis Cl. N. Gen. 



Valve witli double structure. The exterior stratum with transverse strife, composed of 

 puncta; the interior with transverse costse, directed from the margin, where they are thicker, 

 towards the median line. 



The only known species has been placed by Greville and Grunow in the genus Stauroneis, 

 but it has no close relation to any species of that genus, and the peculiar structure of the valve 

 makes it advisable to form for it a new genus. I am unable to point out any close relation be- 

 tween this form and any other, although its general appearance has some resemblance to some 

 Mastogloise. 



1. M. biforinis Grun. (1863). — V. elliptical with rostrate extremities. L. 0,o8 to 0,09; 

 B. 0,032 to 0,035 mm. Median lines with approximate median pores and small terminal fissures, 

 turned in the same direction. Central nodule transversely dilated into a very short stauros. No 

 axial area. Strite slightly radiate, 15 (middle) to 18 (ends) in 0,oi mm. punctate; puncta about 20 

 in 0,01 mm. CosttB 8 — 9 in 0,oi mm. — Stauroneis hiformis Grun. Verb. 1863 p. 154 PI. IV f. 7. 

 Stauroneis australis Grev. Ed. N. Ph. J. V. XVIII p. 187 f. 13 1863. 



Marine: Queensland (Grev.), Bed Sea (Kinker Coll.)! Port Jackson! Labuan! 



I 



