PLATE Xin. 



FIG. 



1 & 2. — Front and side view of a globose, slightly conical body, pretty 

 regularly areolated, and surrounded by a rounded honeycombed 

 riflg. I am indebted to Dr. Greville for poiiiting out the front 

 view, as belonging to the same object, which he decided^ to be 

 "not a Diatom." Can it belong to Stephanopyxis or Xantho- 

 pyxis or some of that obscure group which even Ehrenberg 

 regards as " very doubtful Diatoms ? " See Pritchard, page 827. 

 Itls a very beautiful object, but difficult to get a good view of, 

 as the ring and the globe require different foci. In slide, 

 Vaughan's'Barbados, No. 1 ; magnified about 400 diameters. 



3.— Probably a variety of the Dictyospiris on Plate II, fig. 2, and Plate 

 XI, fig. 4, but with a greater number of spines, and differently 

 arranged. 



4. — Possibly a Lychnocanium, with the apex dilated into a broad flat 

 spatula instead of the usual spine. 



5.— A Rhabdolithes (?) , 



6.— A partially developed form spinning its outer web roimd the 

 nucleus, as in Miiller's description of Halionima. 



1. — Chinese lantern shape in slide. Vaughan's resembles Dictyolithes 

 PjTamidalis of Mik., PI. XX. fig. 30; but this is a much more 

 developed specimen. 



