PLATE XVI. 

 no. 



1. — A short hollow cylinder with large perforations, and ornamented 

 with little pillars. In slide South Naparima, Trinidad, No. 5. 



•2 & 3. — Globular bodies with 2, or 3, or 4, pipe-like openings, the 

 markings on them very irregular in size and distribution, and 

 appear more like warts, or slight depressions, than actual pimc- 

 tures. Measure of diam. of bulb, about .00137. From South 

 Naparima, Trinidad, No. 5. 



4. — Obehsk pillar ; resembles Professor Bailey's Rhizosolenia hebetata, 

 which he found in Kamtskatka. This specimen is from Barbados. 



5. — Two extraordinary long spines fixed by their smaU and branched 

 ends to a very beautifiil oval disk. Apparently the centre or 

 axis of some large Polycystiu in slide Barbados, No. lOOJ^, 

 measures from the centre to the point of one spine, .0228. 

 Drawn as seen with half-inch objective. 



6. — An elegant little transparent plate, without any perforations — a 

 pretty crenate edge. In shde South Naparima, No. 2. 



7. — A Haliomma (?) long, egg-shaped, very spinous and rough. 

 Springfield, Barbados. 



8. — The outer margin or circlet of Haliomma Humboldtii, shewing 

 the points as extensions of the outer sUiceous coat, and not 

 attached to the radial spines or rafters. 



