SOME \ l.w AM) BABE DIATOM! 



Brightwetti* J~ohnsoni, Rdffs^ M. &, Greville in Trans. Mic. Soc, 188c. p. 

 -1 PL 1 f. Hi "Valve with bolder composed of radiating lines of cellules, diminishing in 



Bize from coronal circle to margin, and of ridge-like ribs at sub-regular intervals cellules 

 of coronal circle quite large; central cellules arranged spirally.'' Diameter of disc. .0025 

 to .0036 inch. Springfield Estate. Barbadoes. Plate V. Fig. 10. 



Bylaudsia biradiata, Grev., Trans. M. S., 1861, p. 63 PI. 8. f. 1. -'Valve 

 small, disciform, cellulose; cells quite large in the centre, decreasing gradually in size 

 as they radiate outward; two smooth rays, dilated at their base, not reaching the centre, 

 tubular, this structure being continued through the middle of the dilated bases; no 

 hyaline area nor umbilical centre." Diameter, .0014 to .0025 inch. Cambridge Estate. 

 Barbadoes. Plate V Fig. 13. 



Euodia Barbadenais, Grev. Trans. M. S. 1861 p. 2, PI. 8 f. 6, 7: "Frustules 



semilunate: ends slightly produced; lower margin straight; surface coarsely cellulose, 

 with a small, irregular, central blank space; color yellowish; convex border slightly 

 conical. Distance between ends .0017 to .0024 inch. Springfield Estate, Barbadoes. 

 Plate IV, Pig. 14. 



TrieeraHum eastetta&um, West, Trans. M. S. 1860 p. 147 PI. 7 f. 3: Pritch. 

 Inf. p. 854, PI. 8 f. 29; Schm. At. 78 f. 2; variety 88 f. 16: "Valve small; sides deeply 

 concave; angles broadly rounded, forming segments of circles, separated by silicious 

 lines from central portion, and much elevated above general surface; entire surface uni- 

 formly punctate/ ' Distance between angles, .0018 inch. Springfield Estate, Bart adoes. 

 Plate III, Fig. 10. 



Porodiscus splendiilns, Grev. Trans. M. S. 1865, p. 46 PI. 5 f. 5; rar. Schm. 

 At. 66 f. Q f —Craspedodiscus ovalis, Grun. -'Disc circular, occasionally broadly oval, 

 very convex; a Large, circular, umbilical pseudo-opening; structure a radiating, reticu- 

 late cellulation." Diameter, .0024 inch Springfield Estate, Barbadoes. Plate V. Fig. 5. 



t*oro(fis< its oblongus, Oreo Trans. M. S. 1862, p. 65, PL 4 f , 5; Schm. At. 

 66 f.7, 8, &.—Craspedodiscus obUmgus, Grun. "Dis-elliptical-oblong; pseudo opening 

 large, circular." The radiating lines of granules are not crowded, but the granules them- 

 Belves are very large. Diameters generally .0015 by .0025 inch. Cambridge Estate, 

 Barbadoes. Plate V. Fig. 6. 



The "pgeudo openings" of Dr. GrrevDle, in the Pomdisci, are very deep, sharply 

 defined, circular depressions, punctate at the bottom, as on the remaining surface of 



