KONGL. SV. VKT. AKADKMIHNS IIANDI.INCAK. HAND 27. N:(i 3. I HI 



stomnsing with longitudinal costtu, thus forming a net-work of quadrate alveoli. Lower V. with 

 indistinct axial area, small orbicular central area and 9 stria; in 0,01 mm., composed of distinct 

 puncta, about 9 in 0,oi mm. — PI. Ill f. 6, 7. 

 Marine: Galapagos Islands! 



4. C. forniosa Brun (1891). — L. 0,07.5 to 0,i; B. 0,0.5 to 0,o7 mm. Upper V. with narrow, 

 lanceolate axial area, and slightly radiate costai, 5 in 0,oi mm., anastomosing into a net- work of 

 rectangular alveoli, 4 in 0,oi mm. Lower V. with straight median line, and indistinct axial area. 

 Central area transverse, narrow lanceolate. Terminal areas small and near the margin. Striae 

 6, .5 in 0.01 mm. slightly radiate, coarsely punctate (puncta 8 to 9 in 0,oi mm.) and ending with 

 double rows of puncta. — D. espfeces nouv. p. K! PI. XVIII f. 6. Pant. Ill PI. XXXII 1. 457. 

 A. S. Atl. CXCIII, 42 to 47. 



Marine: Japan, fossil (Brun Coll.)! Indian Ocean (Brun), Wembats (I'ant.). 



A peculiar form, the lower valve of which resembles C. costafa, from which it differs by 

 tlie absence of a marginal annulus. There is also some resemblance to C. versicolor, but the upper 

 valves are entirely dissimilar. 



5. €. yersicolor Brun (1891). — Elliptical. L. O.os to 0,o65; B. 0,035 to O.04 mm. Upper 

 V. with narrow, lanceolate axial area, and strongly radiate costse, 5,5 in 0,0 1 mm. Intercostal 

 spaces transversely lineate, lineolcE 13 in 0,oi mm. Lower V. with straight median line reaching to 

 the margin. Axial area indistinct; central area narrow, transverse. StrifE 7 in 0,oi mm. slightly 

 radiate, punctate; puncta 14 in 0,oi mm. Median stria; shorter tlian the others. — D. especes 

 nouv. p. 19 PI. XVIII f. 1. A. S. Atl. CXC f. 12 to 14. 



Marine: Japan, fossil (Brun Coll.)! Mogador (Brun). 



<). 0. pinnata Greg. (1859). — Elliptical. L. 0,024 to 0,04; B. 0,019 to 0,o3 mm. Upper 

 V. with broad, axial area and strong, slightly radiate costre, 4 to 5 in 0,oi mm. Intercostal 

 spaces with double rows of puncta, arranged in oblique lines. Lower V. as in Cocc. pseudo- 

 niarginata, but smaller and witli closer striation (according to Grunow). — C. pinnafa Greg. M. 

 J. VII p. 79 PI. VI f. 1. V. H. Syn. PI. XXX f. 6, 7. A. S. Atl. CLXXXIX f. 1 to 5. C. 

 Lorruziana Perag. D. de Villefranche PI. V f. 38? C denticulata Leud. Fortm. D. de Ceylon 

 PI. I f. 2? Bhaphorms Archcri O'Meara Quek. M. J. Vol. VII ser. 2 PI. VII f. 12? 



Marine: Spitsbergen! Einmark! North Sea! Mediterranean Sea! Adriatic! Seychelles! Island 

 of Rhea near Singapore! 



Pleuronels Cl. N. G. 



Frustules with a mai'ginal rim. Valves In-oadly elliptical to orbicular. Upper valve with 

 more or less narrow axial area and radiate costa% alternating with double rows of puncta, forming 

 oblique, decus.sating lines. Lower valves with radiate rows of finer puncta. 



1. ('. britannica N^geli (1849). — Broadly elliptical. L. 0,025 to 0,05; B. 0,022 to O.037 

 ram. Upper V. with very narrow axial area. Costa?, (i to 10 in 0,oi mm., alternating with double 

 rows of small puncta (about 18 in 0,oi mm.) forming oblique lines. Lower V. with distinct median 

 line, not reaching to the margin. Axial area indii-itinct. Central area very small and orbicular. 

 Stria' about 10 in 0,oi mm. Rim with about 5 costte in 0,oi mm. — C. hr'tt. KtJTZ. Sp. Alg. 

 p. 890. V. H. Syn. PI. XXX f. 1, 2. C. coronata Btw. M. J. VII p. 179 PI. IX f. 2? C.pseudo- 

 marginata Jan. Rab. Honduras D. PI. I f. 16? C. scutelUformis Grun. in Cl. M. I). 148, 154, 208 

 —210. C. cosfata var. A. S. Atl. CLXXXIX f. 8? (J. eximia A. S. Atl. CXCII f. 31? 



Marine: Mediterranean Sea! Adriatic (Grun.)! Barbados! 



This species resembles, under a low power, C ScutcUin)/, from which it is however widely 

 different. C. Ninypovusin Petit (Mem. Soc. Cherbourg XXIII p. 207 PI. I a, 1881) perhaps repre- 



