. A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). 336 INVERTEBRATE MORPHOLOGY. ment unusual for Invertebrates. The extremity of the pro- cess is occupied by a uumber of clear transparent cells which serve as a cornea {co) and which are continuous with a zone of pigmented cells (/)</) analogous to an iris, and which pass grad- ually over into ordinary ectodermal cells. Upon the inner surface of the cornea is a mass of transparent cells constitut- ing a lens (^, and below this lies the sensory portion of the eye. Th
. A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). 336 INVERTEBRATE MORPHOLOGY. ment unusual for Invertebrates. The extremity of the pro- cess is occupied by a uumber of clear transparent cells which serve as a cornea {co) and which are continuous with a zone of pigmented cells (/)</) analogous to an iris, and which pass grad- ually over into ordinary ectodermal cells. Upon the inner surface of the cornea is a mass of transparent cells constitut- ing a lens (^, and below this lies the sensory portion of the eye. The optic nerve as it comes towards the eye branches; 1. â ''â S;'M* Pig. 150.âEye of R?<^^«n (modified sliKhtly from Patten). CO = cornea. op, op' = optic nerve. I = lens. pg = pigment-cells. la = blood-lacuna. rt = retina. tl = tapetum lucidtiin. one branch {op'), passing to one side of the eye, bends inwards towards the axis of the eye between the retina-cells {rt) and the lens. The sensory portion of the eye consequently is in- verted, the retina-cells being turned away from the light which must pass through the fibres of the optic nerve to reach them. Below the retina and separated from it by a space is a layer of tissue, the tapetum Ivcidum {tl), which serves as a reflector and gives the metallic lustre which is characteristic of the. 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 McMurrich, J. Playfair (James Playfair), 1859-1939. New York : H. Holt
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1894
