. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. CHARACTERISTIC DEEP-SEA TYPES. SEA-URCIIINS. 101 Perhaps the most interesting group of sea-urchins discovered by the late deep-sea explorations are the Pourtalesiai. The first Pourtalesia was dredged by Pourtales in the Straits of Florida, — a single specimen only (Fig. 373), but sufficiently perfect to enable me to make an examination of this extraordinary type, so different at first glance from any sea-urchin previously Fit;-. 373. Ksr. :JT4. The study of that species, Pourtalesia miranda (Fig. 374)
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. CHARACTERISTIC DEEP-SEA TYPES. SEA-URCIIINS. 101 Perhaps the most interesting group of sea-urchins discovered by the late deep-sea explorations are the Pourtalesiai. The first Pourtalesia was dredged by Pourtales in the Straits of Florida, — a single specimen only (Fig. 373), but sufficiently perfect to enable me to make an examination of this extraordinary type, so different at first glance from any sea-urchin previously Fit;-. 373. Ksr. :JT4. The study of that species, Pourtalesia miranda (Fig. 374), showed affinities to a singular family of urchins described from the chalk, as well as extended relationship to types considered as long extinct. The Ananchytidse, to which the Pourtalesise are allied, are perhaps the most typical cretaceous sea - urchins. They all have large coronal plates, recalling the Echini, with a disconnected apical system characteristic of many cainozoic spa- tangoids ; they have a sunken anal system, some of them a most remarkable anal beak, and a very striking pouch, in which the mouth is placed. They possess rudimentary fascioles, and their. 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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