. Fig. 30. One of the smaller carapace photophores of Systellaspis debilis; a, in vertical section, the external surface being to the right; b, in surface view. The haemocoele is indicated by mechanical stippling, gr. granules; nucleus of chitogenous epithelium; nucleus of photogenic cell; reflector nucleus; clear area of photogenic cell. The contrast between the carapace photophores of S. affinis and those of S. debilis adds still further to the divergence of these two species with regard to their photo- phores. {e) The photophores on the ielson The pho
. Fig. 30. One of the smaller carapace photophores of Systellaspis debilis; a, in vertical section, the external surface being to the right; b, in surface view. The haemocoele is indicated by mechanical stippling, gr. granules; nucleus of chitogenous epithelium; nucleus of photogenic cell; reflector nucleus; clear area of photogenic cell. The contrast between the carapace photophores of S. affinis and those of S. debilis adds still further to the divergence of these two species with regard to their photo- phores. {e) The photophores on the ielson The photophores on the telson of S. debilis consist of two pigmented spots placed dorsally in the median line. The anterior spot is situated not far behind the base of the telson, just between the posterior points of attachment of the pair of telson extensor muscles, and the posterior rather smaller spot is placed near the apex at the level of the anterior limit of the posterior armature of six pairs of articulated lateral spines (cf. Kemp, 1906, pi. ii, fig. 7). Ahhough occupying a dorsal position rarely encountered in
Size: 3130px × 1597px
Photo credit: © The Bookworm Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, booksubjectocean, booksubjectscientificexpediti
