. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. PHOTOPHORES OF DECAPOD CRUSTACEA 311 on the exopod, while the external ramus of the uropod had "a row of four near the middle and another row of two or three at the distal end, the foremost in line with the tooth of the outer margin". At the time when I examined the appendages, however, no trace of colour remamed in these organs, and it required close examination to determine their position. Although colourless, the organs showed in surface view as small rather opaque areas possessing
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. PHOTOPHORES OF DECAPOD CRUSTACEA 311 on the exopod, while the external ramus of the uropod had "a row of four near the middle and another row of two or three at the distal end, the foremost in line with the tooth of the outer margin". At the time when I examined the appendages, however, no trace of colour remamed in these organs, and it required close examination to determine their position. Although colourless, the organs showed in surface view as small rather opaque areas possessing a faintly mosaic or granular appearance. Both the maxilla and uropod were sectioned for examination. Study of the sections revealed the presence of well-defined structures (Fig. i a, b; Plate XXIV, fig. i) occupying precisely the positions described by Dr Kemp, with the exception that the exopod of the maxilla bears four, not three, of these organs. Three are arranged almost in a longitudinal row, ahhough the second is somewhat lateral to the first and third; while the fourth, which is larger than the other three, is placed on the opposite (morphologically anterior) side of the exopod. This last organ is illustrated in the figures. The integument overlying the organ is not markedly differentiated from the adjacent surface of the limb, so that there is no lens as in the superficial photophores of S. challengeri (Hansen, 1903) and S. lucens (Terao, 1917 as 5. prehensilis). At most, both cuticle and chitin may be somewhat thicker than elsewhere on the limb. The main mass of the organ beneath the integument is composed of fibres arranged in successive parallel sheets (Fig. i a, fib.), the fibres composing each sheet being interwoven in the horizontal. photcen. \_ photcen supih. haem nucfib. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may
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Keywords: ., bookcentury1900, booksubjectocean, booksubjectscientificexpediti
