PLATE XVI
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 punctures. Measure of diam. of bulb, about .00437. From South Naparima, Trinidad, No. 5 .
4. Obelisk Pillar ; resembles Professor Bailey's Rhizosolenia hebetata, which he found in Kamskatka. This specimen is from Barbados.
5. Two extraordinary long spines fixed by their small and branched ends to a very beautiful oval disk. Apparently the centre or axis of some large Polycystin in slide Barbados, No. 100 13/32, 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 slide South Naparima, No. 2.
