. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 126 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY noidea (Regnell, 1945) have been introduced also. The relegation of blastoids to rank as a subclass of the cystoids, as recently pro- posed by Regnell (1945), is a backward step which is not accepted. CARPOIDEA The carpoids, which include ovoid to unevenly angular primi- tive echinoderms having a dorso-ventrally much flattened theca composed of few to many plates and generally a very peculiar. Fig. 1. Analysis of thecal structure of regular eoerinoids and rhombiferan cystoi
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 126 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY noidea (Regnell, 1945) have been introduced also. The relegation of blastoids to rank as a subclass of the cystoids, as recently pro- posed by Regnell (1945), is a backward step which is not accepted. CARPOIDEA The carpoids, which include ovoid to unevenly angular primi- tive echinoderms having a dorso-ventrally much flattened theca composed of few to many plates and generally a very peculiar. Fig. 1. Analysis of thecal structure of regular eoerinoids and rhombiferan cystoids. In upward order, the alternately disposed circlets commonly are designated as basals, infralaterals (outlined by heavy black lines), laterals, radials (outlined by heavy black dots), and orals. Numbers for identification of individual plates are indicated according to the system of Forbes (1848), based on Ehombifera. The exterior of plates other than the orals typically (or primitively) bears a pattern of ridges which is confluent across mid- points of suture lines with the markings on adjacent plates, and among rhombiferan cystoids the pore rhombs are similarly 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 Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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