. 5,2.' VI si' ' dh. nl. cm. ' n. nl. Fig. 16. Part of the preceding section enlarged to show the details of the photogenic cells. The arrow points to the external surface of the photophore. Blood channels are indicated by mechanical stippling, but the remainder of the haemocoele is left white, blood channel; central body; cm. cell membrane; degenerating nucleus; n. nucleus; nl. nucleolus; ^ early stage in the production of the radially segmented zone; ^ later stage of the segmented zone; vacuolated zone.

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Keywords: ., bookcentury1900, booksubjectocean, booksubjectscientificexpediti