SOME NEW AM) RARE DIATOMS. 



Gran., Van II. Syn 110 P. 7; (Biddnlphii?). Valve small, with striated margins; near- 

 ly straight sides ; angles obtuse; large, ovate, minutely punctate, conspicuous processes; 

 sm lace completely tilled with radiant lines of small, round granules. Distance between 

 angles, .0035 inch Cambridge Estate, Barbadoes. Plate IV, Fig. 7. 



Stephana/*}/.* is pulcher, N. Sp. f W. and C. Small ; valve highly convex ; 

 the border composed of a sinole row of elongated cellules, and occupying two-fifths the 

 diameter of the disc ; areolation as in other species of the Genus, 8 in .001 inch. New- 

 castle Estate, Barbadoes. Diameter of disc. .0021 inch. Plate V, Fig. 3 



Trie, areolatum, Oreo. Trans. M. S. 1864 p. 71 pi. 9 f. 13 ; (var. mnosa, Schm. 

 At. 77 f. 14) "Valve with slightly concave sides and acute angles ; surface covered 

 with rather large areola 1 , while very short vein like lines project from the sides of the 

 valve." Distance between the angle?, .0027 inch. Cambridge Estate, Barbadoes. Plate 

 III, Pig. 13. 



Trie f/rattttfafma. JV. Sj?., W. and C. Small ; sides straight, occasionally 

 one or more concave ; entire margin marked by a row of large granules ; angles acute ; 

 surface marked by coarse, pearly, embossed granules, thinly and irregularly scattered ; 

 a circular blank space in the centre. Springfield Estate, Barbadoes. Plate IV, Fig. 9. 



Trie, celltilosiini, Orev., Trans. M. S. 1861 p. 44 pi. 4 f. 11 ; Son. At. 95 f. 28- 



32 : I Var. SimbirsJeiana, Witt Archangel Diats., p. 32 pi. 11 f. 8-10; Schm. At. Ill f. 

 30 — 33; 112 f. 4. Sides of valve straight, sometimes slightly incurved; angles with 

 pseudo-nodules, obtuse, sepaiated from the centre by transverse lines, which appear as 

 linear spaces unoccupied by cellules ; coarsely cellulose ; cellules of central portion 

 more or less ovate or oval and disposed in a radiating direction, thongh not in lines ; 

 those of the angles somewhat quadrate, giving them a cancellated aspect, and arranged 

 in rows parallel with the separating line. Distance between angles, .003 to .004 inch. 

 Cambridge Est., Barbadoes. Plate IV, Fig. 8. 



Var, major, W. and C. Characteristics in general those of T. cellulosimi, but 

 larger, the distance between the angles being .006 inch; sides slightly concave ; the 

 granulation also somewhat denser ; same localitj' as the genuine. Plate IV, Fig. 3. 



Trieeratieum Caribceum, N. Sp. W. and C. -Small; sides straight ; angles 

 Blightly rounded ; entire surface of valve covered by large granules, arranged in radiat- 

 ing lines ; do nodules at angles. Diameter between angles, .0025" to .0035 inch. Cam. 

 bridge Estate, Barbadoes. Not uncommon. Plate III, Fig. 11. 



