These segmentally-arranged brown spots may perhaps be photogenic.
Greef, Acta Ac. German., xxxix. 1877.
Greef, Zeitschr. f. wiss. Zool. xlii. 1885, p. 432.
Buchanan, Quart. J. Micr. Sci. xxxv. 1894, p. 445.
Buchanan, Sci. Proc. R. Dublin Soc. viii. (n.s.) 1893, p. 169.