. A manual of zoology. Zoology. 3C>4 AKTIIROrODA abundant in the Silurian. The body (Ug. ,:;So) consists of Iiead and trunk, the latter segmented. lu the ^"oung the segments are \-erv few, but increase in number i_io-jo, according to the species) with age. The luiider seg- ments frei|uenth' differ from the rest and form an abdomeli or pvgiJi/nii. Dorsal!}' the animal is di\ided b\- U\'o groows into tliree lobes, marking off in the head a i^Lil'flld anil two ,t,'< in the trunk rliijiliis and two plt:iii\c. Ow the head there are usuall)- a pair of compoimd eyes, ^^â¢lrich in the
. A manual of zoology. Zoology. 3C>4 AKTIIROrODA abundant in the Silurian. The body (Ug. ,:;So) consists of Iiead and trunk, the latter segmented. lu the ^"oung the segments are \-erv few, but increase in number i_io-jo, according to the species) with age. The luiider seg- ments frei|uenth' differ from the rest and form an abdomeli or pvgiJi/nii. Dorsal!}' the animal is di\ided b\- U\'o groows into tliree lobes, marking off in the head a i^Lil'flld anil two ,t,'< in the trunk rliijiliis and two plt:iii\c. Ow the head there are usuall)- a pair of compoimd eyes, ^^â¢lrich in the voung were frei|uentl\' \eirtral. but are brought to the dorsal surface with growth. Fur \-ears little was known of tlie ^â entral side, but latelv specimens of hccki (lig. 3S1) from the I'lica slate ha\-e revealed. 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 Hertwig, Richard, 1850-1937; Kingsley, J. S. (John Sterling), 1854-1929, ed. and tr. New York, H. Holt
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1912
