. e, ?â phot. u. lOOU Fig. 31. The posterior telson photophore of Systellaspis debilis in surface view. The integument is trans- parent and is not represented in the figure, nucleus of chitogenous epithelium ;/)/zo?.m. photogenic unit ("rosette"). when unstained. Even when stained with carmine, which they take up readily, they still possess a yellowish hue. The rosette-like spheres are grouped in a horizontal sheet, ten to twelve spheres forming the posterior and about twenty spheres the anterior photophore. Underlying them are apparent phases in their differentiati
. e, ?â phot. u. lOOU Fig. 31. The posterior telson photophore of Systellaspis debilis in surface view. The integument is trans- parent and is not represented in the figure, nucleus of chitogenous epithelium ;/)/zo?.m. photogenic unit ("rosette"). when unstained. Even when stained with carmine, which they take up readily, they still possess a yellowish hue. The rosette-like spheres are grouped in a horizontal sheet, ten to twelve spheres forming the posterior and about twenty spheres the anterior photophore. Underlying them are apparent phases in their differentiation as in S. affinis (p. 358, Fig. 27), and the whole organ is closely surrounded by a mass of closely packed small dense nuclei resembling those of the chitogenous epithelium. No lens is present over the surface of these organs, and I have not been able to dis- cover any trace of innervation. It will be realized that the telson photophores of S. debilis possess the structure which might have been expected to be shown by the carapace organs. Their similarity to some of the photophores of S. affinis renders the relations between the two species still more obscure. The variety of photophores encountered in various situations on the body and limbs in the members of the family Hoplophoridae which have been examined in the course
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Keywords: ., bookcentury1900, booksubjectocean, booksubjectscientificexpediti
