. Annals of the New York Academy of Sciences. Science. REPORT ON THE HEXACTINLE 33 was a single additional pair of this fifth cycle. In the individual with a total of 91 pairs irregularities occurred in only two of the primary interspaces. The fourth cycle was completely de- veloped so that there were 10, 10, 20, 40= 80 pairs of regular mesenteries ; and in addition 11 pairs representing a fifth cycle. Eight of these were situated in a primary interspace next one of the directive pairs and alternated in a regular manner with D. the pairs of the older cycles ; the other three occurred in the mi
. Annals of the New York Academy of Sciences. Science. REPORT ON THE HEXACTINLE 33 was a single additional pair of this fifth cycle. In the individual with a total of 91 pairs irregularities occurred in only two of the primary interspaces. The fourth cycle was completely de- veloped so that there were 10, 10, 20, 40= 80 pairs of regular mesenteries ; and in addition 11 pairs representing a fifth cycle. Eight of these were situated in a primary interspace next one of the directive pairs and alternated in a regular manner with D. the pairs of the older cycles ; the other three occurred in the middle lateral interspace of the other side of the body, one of them intervening between the primary mesenteries on one side of the interspace and the succeeding member of the fourth cycle, while the other two alternated with the fourth cycle pair next the primary pair on the other side of the interspace. Fin- ally in the individual with 104 pairs there are again four cycles regularly developed ; in a primary interspace next one of the Annals N. Y. Acad. Sci., XIV, June 5, 1901— 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 New York Academy of Sciences. New York, New York Academy of Sciences
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