Discovery reports (1941) Discovery reports discoveryreports20inst Year: 1941 PHOTOPHORES OF DECAPOD CRUSTACEA 319 perhaps they too may undergo eruption in a similar manner. This would lead to the belief that there is no hard and fast distinction to be drawn between the cells of these two zones. The rod-like bodies (Figs. 3, 4, ) which alone distinguish the dorsal cells of the luminous portions of the tubules are slightly refractile spindle-shaped bodies, staining deeply in acid fuchsin and arranged perpendicularly at the basal ends of the cells. They do not extend completely to the bas
Discovery reports (1941) Discovery reports discoveryreports20inst Year: 1941 PHOTOPHORES OF DECAPOD CRUSTACEA 319 perhaps they too may undergo eruption in a similar manner. This would lead to the belief that there is no hard and fast distinction to be drawn between the cells of these two zones. The rod-like bodies (Figs. 3, 4, ) which alone distinguish the dorsal cells of the luminous portions of the tubules are slightly refractile spindle-shaped bodies, staining deeply in acid fuchsin and arranged perpendicularly at the basal ends of the cells. They do not extend completely to the basal end of the cell, for their tips end some little distance from it, leaving a narrow but clear basal zone of cytoplasm. In haematoxylin- stained preparations the rods are not visible. 25l degn Fig. 4. The dorsal portion of one of the luminous liver tubules of Sergestes comiculiim. Fixed Duboscq, Delafield's haematoxylin and eosin. degenerate nucleus lying in the lumen of the tubule; degenerating nucleus of an erupting cell; degenerating nucleus of a reflecting cell; normal nucleus of an erupting cell; normal nucleus of a reflecting cell; refractile rod. The cells intervening between the dense luminous tubules and the digestive tubules themselves are not remarkable. It should be stated that the normal liver tubules of Sergestes are composed of highly vacuolated irregularly shaped cells whose nuclei are almost completely achromatic. They thus have a very delicate and tenuous appearance, and the organs of Pesta by contrast are very conspicuous. The intervening cells under discussion are denser than those forming the digestive tubules, and their nuclei are rich in chromatin. The cellular differentiation of the luminous tubules bears a considerable, if not complete, relation to the coloration of the organs of Pesta as seen in fresh material (pp. 314,315). The lower portion of the organ is described as Antwerp b
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