Vol. VIII, Plate 16. Nebula near 15 Monocerotis. A very interesting region.
The brighter portion is about 10' in diameter,- fairly bright, and shows a
number of irregular lanes and one clear-cut "bay" on the north which
strongly suggests dark matter. There are much fainter patches north and
south of the main body. The nebula lies in a well-marked rift about 20'
wide and at least a degree long, extending across the plate in p.a. 20^deg^; the
cutting off of the fainter stars is very noticeable. 0 s.n.