Two strew slides from Springfield, Barbados. Fossil marine material. Prepared by Richard Gosden. Materials ex Schrader.
Slide one.
Mounted in Naphrax and dated February 1961. Olympus BHB microscope using 450nm LED light. As well as the wider field of view of the strew, and a 20x objective image of a partial Rylandsia biradiata, I imaged a couple of Hemiaulus sp. using the 63x Leitz Pl Apo 1.4 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. Images stacked in Zerene (Pmax).
Hemiaulus alatus Greville, 1865. Published in: Greville, R.K. (1865). Descriptions of new and rare diatoms. Series XV. Transactions of the Microscopical Society, New Series, London 13: 24-34, 2 pl.s [III, IV]. Page 31, Plate III [3], Figure 14.
Hemiaulus lyriformis Greville, 1865. Published in: Greville, R.K. (1865). Descriptions of new and rare diatoms. Series XV. Transactions of the Microscopical Society, New Series, London 13: 24-34, 2 pl.s [III, IV]. Page 30, Plate III [3] Figure 11, Plate IV [4] Figure 21. This name is currently regarded as a synonym of Williamriedelia lyriformis (Greville) S.Blanco & C.E.Wetzel, 2016. Published in: Blanco, S. & Wetzel, C.E. (2016). Replacement names for botanical taxa involving algal genera. Phytotaxa 266(3): 195-205. Page 202.
Rylandsia biradiata Greville, 1861. Published in: Greville, R.K. (1861). Descriptions of new and rare Diatoms. Series II. Transactions of the Microscopical Society, New Series, London 9: 67-73, pl. VIII. Page 68, Plate VIII [8], Figure 1.
Reasonably happy with the ID’s for the Hemiaulus sp..
Second slide.
This was a bit more sparse than the first one. Dated October 1960. Olympus BHB microscope using 450nm LED light. As well as the wider field of view of the strew, I imaged an Asterolampra sp. using the 63x Leitz Pl Apo 1.4 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 47 images stacked in Zerene (Pmax).
Possibly Asterolampra concinna Greville, 1862. Published in: Greville, R.K. (1862). On the Asterolamprae of the Barbadoes deposit. Transactions of the Microscopical Society, New Series, London 10(2): 41-55, pls VII, VIII. Page 46, Plate VII, Figure 10-12. A distorted, partial, example.