Journal of morphology . l 17. 9^ ^^iif^ I 7/ I nil -* ^^^^^ /V/ ( .% (-^lotlcl. \ V % 340 AVERS. EXPLANATION OF PLATE II. Fig. I. A horizontal section of the ear of Petromyzoji marinus, through themiddle of the vertical diameter of the saccular appendix or lagena, showing thebifurcate sense organ of the lagena, and the nerve supply. X 45- c., the cupulasterminales of the sense organs. Fig. 2. A vertical section through the posterior ampullar sense organ of thePetromyzon ear, to show the mutual relations of sensory epithelium, canal wall, andnerve. X 140. c.^ canal wall thickened where the nerv

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Journal of morphology . l 17. 9^ ^^iif^ I 7/ I nil -* ^^^^^ /V/ ( .% (-^lotlcl. \ V % 340 AVERS. EXPLANATION OF PLATE II. Fig. I. A horizontal section of the ear of Petromyzoji marinus, through themiddle of the vertical diameter of the saccular appendix or lagena, showing thebifurcate sense organ of the lagena, and the nerve supply. X 45- c., the cupulasterminales of the sense organs. Fig. 2. A vertical section through the posterior ampullar sense organ of thePetromyzon ear, to show the mutual relations of sensory epithelium, canal wall, andnerve. X 140. c.^ canal wall thickened where the nerve penetrates it to enter thesense cells, whose position is indicated by the pink shade, , , and theaccessory nerve in long and cross section. Fig. 3. A transverse section (radial) of the cochlear organ and canal of theRabbit, to show the usual relation of sensory hair band to the limbus sulcus spiralisin parafhne preparations. *, the region from which Fig. 5 is taken, fi the caps ofthree hair cells, pulled off a

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Keywords: ., bookauthorwistarin, bookcentury1800, bookdecade1890, bookyear1892