KONGL. SV. VET. AKADEMIENS HANDLINGAU. BAND 26. N:0 2. 7.) 



1. N. iiicobarica G-run. (1863). •— V. broadly elliptical. L. 0,o244 to 0,o43; B. 0,oi9 to 

 0,03 mm. Median line with moderately approximate median pores and large comma-like terminal 

 iissures, turned in the same direction. Axial and central areas uniting in a large lanceolate space, 

 having on both sides of the median line a row of large, sometimes confluent puncta. StricE 7 to 

 8 in 0,01 mm. smooth, radiate throughout. — GtRUN. Verh. 1863 p. 150 PL V f. 8. A. S. Atl, VlII 

 f. 57, LXX f. 35, 36. Cl. Vega p. 505 PL XXXV f. 16, 



Marine: Ceylon! Nicobar Islands (Grrtin.), Celebes (Atl.), Cape of Good Hope (Atl.), Cape 

 Horn (Petit). 



2. N. Ny Cl. N. Sp. — V. elliptical, with broad rounded ends. L. 0,o4; B. O.ois mm. 

 Median line with large comma-like terminal fissures, turned in the same direction. Axial and 

 central area united in a large lanceolate area having on both sides of the median line a row of 

 small puncta, and around the central nodule a few larger stigmas. Strise, 16 in 0,oi mm., 

 apparently smooth. — PL I f. 24. 



Marine: Java! 



Cymatoneis Cl. N. G. 



Valve more or less elliptical or lanceolate in outline, divided by one or several longitudinal 

 ridges into two or more divisions. Median line with approximate central pores and elongated ter- 

 minal fissures, at some distance from the ends of the valve. Axial area narrow, central small, 

 usually rhomboidal. Structure: puncta disposed in transverse and straight longitudinal' rows — 

 Zone not complex. 



This little group of very characteristic forms seems to be most nearly akin to Scoliopleura, 

 although no species has any very close connection with that genus. The structure of the valve is 

 the same as in Scoliopleura Peisonis and the ridges on both sides of the median line recall those of 

 Scoliopleura. In several forms there is a tendency in the median line to be sigmoid. 



1. C. sulcata Gbbv. (1863). — V. convex, with triundulated margins, and apiculate or sub- 

 rostrate ends. L. 0,045 to 0,06; B. 0,025 to 0,033 mm. Axial area very narrow, dilated around 

 the central nodule to a rhomboidal space. Median line slightly sigmoid; terminal fissures elongated, 

 distant from the ends. Ridges two or three on each side of the median line. Striifi radiate at 

 the ends, 8 to 11 in 0,oi mm.; puncta forming straight, longitudinal rows, 14 to 18 in 0,oi mm. 

 — Navic. sulcata Grbv. Trans. Bot. Soc. Edinb. Vol. VIII p. 235 PL III f. 10. Lbud Fortm. D. 

 de Ceylan PL III f. 30. Nav. triundulata Grun. Hedwigia VI p. 27 (1867). M. M. J. 1877 PL 

 CXCV f. 10. Gymaton. snlc. PL I f. 12, 13. 



Marine: Mediterranean Sea! Seychelles (V. H. Coll.)! Madagascar (V. H. Coll.)! Ceylon! 

 Labuan! Japan! Port Jackson! Java! China! Ja])an! New Caledonia (Grev.), Galapagos Islands! 

 Honduras (Grun.), Campeachy Bay! West Indies! Florida! 



Varies occasionally with a slight constriction in the middle and with quadri-undulated margins. 



2. C. quadrisiilcata Gron. (1867). — V. elliptic-lanceolate, with slightly rostrate, obtuse 

 ends. L. 0,05 to 0,09; B. 0,028 to 0,036 mm. Axial area indistinct; central area orbicular. Ridges 

 two on each side of the median line. Striaj slightly radiate, (5 to 8 in 0,oi mm., punctate; puncta 

 forming longitudinal rows. — Nac. guadris. Grun. Novara p. 101 PL I A f. 14. 



Marine: S:t Pauls Island. 



Grunow figures two specimens, which seem to belong to different species. The smaller re- 

 sembles C. sulcata and may be a non-undulated variety of that species. The larger may be iden- 

 tical with the following, but I cannot identify them, as Grunow's figure shews two ridges of equal 

 strength on both sides of the median line. 



