10 CLEVE, DIATOMS FROM THE WEST INDIAN ARCHIPELAGO. 
L. 0,085—0,102 m.m. — Fig. 15. 22 — Virgin Ids. not 
rare, St. Bartholomew. 
68. A. bigibba Grus. (A, ScHm. Atl. Pl. 25 fig. 69—75) Vir- 
gin Ids. St. Bartholomew. 
69. Cocconeis (Orthoneis) punctatissima Grev. (Mier. Journ. 
MI Pag FörRErSEf ob) Var gm ds no ti rare 
0. C. (Orthoneis) ovata Grus. Virgin Ids. rare. 
1. C. (Orthoneis) ecribrosa GRUS. St. Thomas. 
2. C. (Campyloneis) Grevillei W. Sm. Virgin Ids. rare. 
3. OC. Scutellum EHB. Virgin Ids. common. 
4. Achnanthes longipes AG. forma minor. St. Bartholomew. 
5. Glyphodesmis eximia Grev. (Micr. Journ. II pag. 235 
P1. 10 fig. 7—10) Virgin Ids. not rare. 
76. Plagiogramma obesum Grev. (Micr. Journ. VII pag. 211 
PI. 10 fig. 10—13) Virgin Ids., not rare. 
TIC Pl decussatum "Grev. (TC MIST ORIVEp ao see 
122) Virgin Ids. rare. 
Pl. (decussatum var.?) Antillarum Cr. N. var. Broadest 
in the middle, gradually tapering towards the rounded ends. 
Interior septa 4, 2 near the ends, 2 in the middle. Sculpture: 
puncta arranged in transverse and longitudinal rows, crossing 
each other at right angles; transverse rows: 8 in 0,01 m.m. 
L. 0,07—0,0o8. — Fig. 16. 222. Virgin Ids. rare. 
78. Pl. caribeum CL. N. Sp. Outline resembling that of 
P. lyratum GrREv. Interior septa 4, 2 near the ends, 2 
in the middle. The two central septa are connected with 
the end-septa by a strong median rib and by two other 
following the margins of the valve. Sculpture: distinct 
puncta or granules arranged in parallel transverse rows, 
3—9 in 0,01 m.m. DL. 0012 to 0,088 m.m. — Fig. 17 
20 — Virgin Ids. many specimens. 
79. Pl. attenuatum Cr. N. Sp. Small, gradually tapering 
from the middle to the apices. Septa 2 central and 2 
near the ends. The two central septa form in the middle 
a rounded, quadrangular annulus. Sculpture: small puncta 
arranged in parallel, not interrupted transverse lines, 10 
on 0,01 m.m. L. 0,05 m.m. -- Fig. 18. S5, — St. 
Bartholomew, only a single valve. 
80. Pl. inequale Grev. (Miecer. Journ. Vol. VII pag. 210 fig. 
10) Virgin Ids. 
