. Amphioxus and the ancestry of the vertebrates [microform]. Vertebrates; Chordata; Fishes; Ascidiacea; Vertébrés; Cordés; Poissons; Ascidiacés. BALANOGLOSSUS. 243 ION DE- bressen hen dcs vpe re of ncnsta ongs. which By which retes a , and about such a n) as to vohoscis and is, colour. -region. consisting externally of a collar-like expansion of the integument, with free anterior and posterior margins over- lapping the base of the proboscis in front and the anterior portion of the gill-slits behind. In the ventral middle line, at the base of the proboscis and concealed by the collar, is situat
. Amphioxus and the ancestry of the vertebrates [microform]. Vertebrates; Chordata; Fishes; Ascidiacea; Vertébrés; Cordés; Poissons; Ascidiacés. BALANOGLOSSUS. 243 ION DE- bressen hen dcs vpe re of ncnsta ongs. which By which retes a , and about such a n) as to vohoscis and is, colour. -region. consisting externally of a collar-like expansion of the integument, with free anterior and posterior margins over- lapping the base of the proboscis in front and the anterior portion of the gill-slits behind. In the ventral middle line, at the base of the proboscis and concealed by the collar, is situated the mouth (Fig. 113). Following behind the collar is the region of the trunk or body proper, which, in the adult of some species, reaches a relatively enormous length, even extending to. Fig. 113. — Larva of Halanoglosms Kowahvskii, with five pairs of gill-slits; from the right side. (After ) a. Anus. Temporary pedicle of attachment, c. Collar, ch. Notochord. ,.;'..r. Gill-slits. ;;/. Mouth, pr. F'roboscis. two or three feet. The ectodermal covering of the body consists in general of ciliated cells, among which are scat- tered unicellular mucous glands ; the cilia, however, appear to be more prominent on the proboscis than elsewhere. In the region of the trunk, which immediately follows upon the collar region, there are a great number of paired. 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 Willey, Arthur, 1867-1942. New York; London : Mcmillan
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectfishes, bookyear1894
