. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 272 Mr. F. A. Bather on Pholidociclaris anceps. avoid—a mistake due to the fact that the specimen is seen from the inside. In numbering the columns of inter- anibulacrals I forgot to reverse my tracing, as I had intended, with the result that the numbers on the diagram (p. 48) are wrong. This was pointed out by my friend Dr. R. T. Jack- son in a letter of 14th Feb., 1918. As the simplest way of putting the matter right, I avail myself of his kind permission to print some of hi
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 272 Mr. F. A. Bather on Pholidociclaris anceps. avoid—a mistake due to the fact that the specimen is seen from the inside. In numbering the columns of inter- anibulacrals I forgot to reverse my tracing, as I had intended, with the result that the numbers on the diagram (p. 48) are wrong. This was pointed out by my friend Dr. R. T. Jack- son in a letter of 14th Feb., 1918. As the simplest way of putting the matter right, I avail myself of his kind permission to print some of his informal reinaiks, and reproduce the diagram with corrected columns and numbers. Frotoechinus ANCEPS Austin HOLOTYPH X ^ ^ 3 A 5 0'^ «4 ^2 Dr. Jackson writes :— " As regards the numbering of columns in interambulacrum C, as it is an internal view I should have column 1 on the right (compare Perischodomus, my plate 64, fig. 2). Column 2 would then come on the left, column 3 would fall to the right, with the second plate truncating its dorsal border as usual. Column 4 would then start in a plate which is practically pentagonal and on the right of the centre. This, which I call the initial plate of column 4, does not make a very good plate for the second plate in column 3, following your lettering. Column 5 starts with a pentagon, and, as I imagine, passes through the small fragmentary plate on the dorsal border of the initial pentagon. The plate on the left (if there are two plates, which looks probable to me) would, apparently then be the initial plate of column 6, which falls to the left of the centre (light of the centre as seen from the outside). All this something as I show in Hyattechinus. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original London, Taylor and Francis, Ltd
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Keywords: ., bookce, booksubjectbotany, booksubjectgeology, booksubjectzoology
