. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. PHOTOPHORES OF DECAPOD CRUSTACEA 343 The foregoing information elicited from a study of serial sections renders intelligible the appearance of the carapace photophores in superficial view. In all three species studied the organs are readily visible in specimens stored in formalin, and since those of H. typiis were most clearly defined in my specimens in this view they will be described as a typical example of the organs. In this species the organs have the form of five short amber-coloured strea
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. PHOTOPHORES OF DECAPOD CRUSTACEA 343 The foregoing information elicited from a study of serial sections renders intelligible the appearance of the carapace photophores in superficial view. In all three species studied the organs are readily visible in specimens stored in formalin, and since those of H. typiis were most clearly defined in my specimens in this view they will be described as a typical example of the organs. In this species the organs have the form of five short amber-coloured streaks, two of which are situated anteriorly and three posteriorly on a line curving upwards and backwards from the antero-ventral margin of the cara- pace. The whole carapace is lightly dotted with contracted carmine chromatophores, but these are most numerous around the photophores, where they form a loose dorsal cap to the photogenic cells. The lens is seen as a white bar ventral to the photogenic cells, and is most apparent in the anterior pair of photophores, which are more highly diff^erentiated than the posterior three. Using a moderately high power, a faint white cloudiness was seen in the basal parts of the clear areas of the photogenic cells. This was not seen in the other species examined, nor in the sections. It is not easy to say at this stage whether this was due to a precipitate caused by fixation and preservation in formalin, or whether on the other hand the emptiness of the photogenic cells previously stressed is evidence of imperfect fixation and photcnv. bv. lOOjj. Fig. i8. Semi-diagrammatic external view of the most anterior left carapace photophore of Hoplophorus typus. ab represents a plane of section corresponding to that of Fig. 17. The vertically striated area is the lens; the remainder of the integument is assumed for the purpose of the figure to be entirely transparent and is not shown, blo
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