. A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). 122 INVKRVKBllA TE MOUrilOLOGY. of the cavity is foinietl of liigh ciliated cells probably uervous in fuuctiou, and above tlieru is a mass of otoliths suppoiicd on fonr incurved rods of fused cilia, one of which forms tlie termination of each of the four meridional grooves. In addition to this sense-organ, \vhi<!h is to be regarded as of the same function as the otocysts of the medusie, there. Fig. Ql.—Pleurobmchi'ii sken foh the Abohal Pole (after Aoassiz). eg = cil
. A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). 122 INVKRVKBllA TE MOUrilOLOGY. of the cavity is foinietl of liigh ciliated cells probably uervous in fuuctiou, and above tlieru is a mass of otoliths suppoiicd on fonr incurved rods of fused cilia, one of which forms tlie termination of each of the four meridional grooves. In addition to this sense-organ, \vhi<!h is to be regarded as of the same function as the otocysts of the medusie, there. Fig. Ql.—Pleurobmchi'ii sken foh the Abohal Pole (after Aoassiz). eg = ciliiited groove. p = polar urea. ot = otocyst. re = radial caual. t = tentacle. lies at each end of the sagittal axis of the sensory dome a so- called pole-area (Fig. C7, p), the cells of which are furnislietl with small plates of fused cilia, each area being surrounded by a thickered ciliated rim. These structures are from tlieir form and situation supposed to be sensory, and an olfactory function has been attributed to them. The tentacles (Fig. <)7, t), of which there are two, situated at the extremities of the transverse axis, are present in all forms except the Beroids. Each tentacle lies in a ilee]) depression termed the fenfacle-fiheath and consists of a princi- pal axis which gives rise to a large number of secondiuv tentacles arranged upon one side only. Both the priniiuv axis and the secondary tentacles are solid, being composed mainly of muscle-cells and containing no prolongation of the tentacular vessel. In 3Inemiopsis and its allies and in Cestum. 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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