An arrangement of Triceratium sendaiense diatoms from Sendai (written as Sandai on the slide), Japan. Mounted in Styrax and Balsam (I think it says ‘bals’ after Styrax on the label). Some yellowing of the mountant. Lower label has ‘Triceratium sendaiense arcticum var.?’ written on it. No makers name. Olympus BHB microscope using 450nm LED light. As well as the arrangement, I imaged the upper middle one using the 20x Nikon Plan Apo NA 0.65 objective (these are big diatoms). Olympus Aplanat Achromat condenser, oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 67 images stacked in Zerene (Pmax).
Triceratium sendaiense A.W.F.Schmidt 1891. Published in: Schmidt, A.[W.F.] (1891). Atlas der Diatomaceen-kunde. Series V: Heft [41/42]. pp. pls 161-168. Leipzig: Fues’s Verlag (R. Reisland). Plate 165, Figure 1 (as ‘Sendaïense‘). These ones do look like the Schmidt’s Atlas drawings for this species so I am fairly confident with the name.
I’m not sure on the maker for this, but I have just imaged a few of them by the same maker, and they are all interesting slides. If you want to see others by this maker search for BBBBB in the search function.
EDIT – based on the handwriting and style, and some conversations with experts, I this could be by Edmund Grove (of Grove and Sturt). But I have no 100% proof of this at the moment.