KONGL. NV. Vl-rr. AKADEMIKN-S HAN 1 )LIN(;A U. liANI) 26. N:() 2. 75 



1. N. iiicobaricu (iiuiN. (Im;;-)). — V. broadly elliptical. L. 0,0244 to (I,(i4.i; l>. Odn to 

 (),(i:! mill. Median line with moderately approximate median pores and large eonima-Jike li'iiiiinal 

 Hssures, turned in the same direetion. 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. Stria- 7 to 

 8 in 0,01 mm. smooth, radiate throughout. — (Irun. Verb. I«(i3 p. 150 PI. V f. S. A. S. Atl \'\U 

 f. 57, J.XX f. 35, 36. Cl. Vega p. 505 PI. XXXV f. 16. 



Marine: Ceylon! Nicobar Islands ((Trim.), (.'elebes (Atl.), ('ape of ({ood Hojie (Atl.) ("ape 

 Horn (Petit). 



2. N. Ny Cl. N. Sp. — V. elliptical, with broad rounded ends. L. 0,04; P>. 0,(ii8 miii. 

 Median line with large comma-like teinninal 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. Striaj, 16 in 0,01 mm., 

 apparently smooth. — PI. I f. 2-4. 



Marine: Java! 



Cymatoneis Cl. N. G. 



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

 ridges into two or more divisions. Median line witli 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 veiy 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 Sroliojilciira Fclsoiiis and the lidgcs 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 Grev. (1X63). — V. convex, with triundulated margins, and apiculate or sub- 

 rostrate ends. L. 0,045 to 0,o6; B. 0,02o 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 eiuls. Ridges two or three on each side of the median line. Stri;e radiate at 

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

 — Xuvic. sulcata Grev. Trans. Bot. Soc. Edinb. Vol. VIII p. 235 PI. Ill f. 1<). Leud Fortm. D. 

 de Ceylan PI. Ill f. 30. Nar. frhuidulata Grun. Hedwigia VI p. 27 (1.S67). M. M. J. 1877 PL 

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



Marine: Mediterranean Sea! Seychelles (V. H. C(dl.)! Madaga.scar (V. H. Coll.)! Ceylon! 

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

 Honduras (Grun.), Campeachy Bay! A\^est Indies! Florida! 



Varies occasionally with a .slight constriction in the middle and with (|uadii-un(lulatc(l margins. 



2. C. qiiadrisulcata Grun. (1«()7). — V. elliptic-lanceolate, with slightly rostrate, obtuse 

 ends. L. 0,0.5 to O.oo; B. 0,o2k to O,o.ic, mm. Axial area indistinct; central area orbicular. Eidges 

 two on each side of the median line. Stria' slightly radiate, (> to S in (),oi mm., punctate; jiuncta 

 forming longitudinal rows. — Xar. /jiKidris. Grun. Novara p. 101 PL i A f. 14. 



Marine: S:t Pauls Island. 



Grunow figures two specimens, which seem to belong to ditt'erent 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 eijual 

 strength on both sides of the median line. 



