. The Biological bulletin. Biology; Zoology; Marine biology. THE EYE OF RIMICARIS SP. (CRUSTACEA) 107. Figure 8. Micrographs of tiie eye of the grass shrimp, Palaemonetes vulgaris. (A) One-micrometer plastic section through the dioptric apparatus. The four cone cells that form each crystalUne tract are visible in the center of the array. (B) Higher magnification light micrograph of a l-/im section through the photoreceptors. Each rhabdom (r) consists of a cylinder of tightly packed microvilli that occupy relatively little of the retinal volume. (C) Electron micrograph showing the rhabdoms (r)
. The Biological bulletin. Biology; Zoology; Marine biology. THE EYE OF RIMICARIS SP. (CRUSTACEA) 107. Figure 8. Micrographs of tiie eye of the grass shrimp, Palaemonetes vulgaris. (A) One-micrometer plastic section through the dioptric apparatus. The four cone cells that form each crystalUne tract are visible in the center of the array. (B) Higher magnification light micrograph of a l-/im section through the photoreceptors. Each rhabdom (r) consists of a cylinder of tightly packed microvilli that occupy relatively little of the retinal volume. (C) Electron micrograph showing the rhabdoms (r) with interspersed reflecting pigment cells (rpc). The scale bar in (C) represents 68 iim in (A), iim in (B), and ^m in (C). eye of P. vulgaris. The overall entrance aperture for one wing is nearly planar and about 5 mm^ in Rimicaris sp. and spherical and about mm^ in P. vulgaris. When the retina is considered as a slab of tissue, the rhabdom comprises about 10% of the volume at the level of the R- segments in P. pugio and 13% in P. vulgaris. The corre- sponding volume density of rhabdom in Rimicaris sp. ranges from 80% to 85%. The geometrically arranged dioptric apparatus of Pa- laemonetes (Figs. 8A, and 9) has been replaced in Rimi- caris sp. by a smooth cornea (Fig. 3A, C) lined by a corneal epidermis without the cone cells that form the quadri-. 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 not perfectly resemble the original Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-; Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report; HighWire Press. Lancaster, Pa. [etc. ] : Lancaster Press, inc. [etc. ]
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