. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. CHAUAt TKK1ST1C DEEP-SEA TYPES. ACALEPHS. 137 is still problematical, surrounding the branch where they occur like minute sponges. They are found to consist of a multitude of flask-shaped receptacles. The genus Cladocarpus was established by Allinan for a re- markable plumularian obtained in the eastern part of the North Atlantic during one of the expeditions of the " ; Cladocarpus paradisea (Fig. 436), a beautiful species, very striking from its deep and widely separated hydrothecae, was
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. CHAUAt TKK1ST1C DEEP-SEA TYPES. ACALEPHS. 137 is still problematical, surrounding the branch where they occur like minute sponges. They are found to consist of a multitude of flask-shaped receptacles. The genus Cladocarpus was established by Allinan for a re- markable plumularian obtained in the eastern part of the North Atlantic during one of the expeditions of the " ; Cladocarpus paradisea (Fig. 436), a beautiful species, very striking from its deep and widely separated hydrothecae, was dredged off Tennessee Reef, and off the Samboes, from 174 fathoms. Hippurella is a genus founded by Allman for hydroids in which the basal ends of the branches carry normal pinnae, while the outer end of the same bear verticillately arranged ribs modi- fied for sheltering the sexual bodies. Hippurella annulata grows in tufts, numerous undivided stems springing from a com- mon base. (Fig. 437.) It is of a rather rigid habit; it was dredged off Pacific Reef, from 283 fathoms. In Callicarpa we have whole branches specialized and modified for the protection of the sexual bodies. In Callicarpa gracilis (Fig. 438) the gonosome closely resembles a spike of wheat, and springs by a short peduncle immediately from the main stem. (Fig. 439.) The most important of the family of Plumu- laridae devoid of movable nematophores is Pleu- rocarpa, dredged from the neighborhood of the island of St. Vincent in 95 fathoms. In the single known specimen the gonosome (Fig. 440) certainly is the most extraordinary modifica- tion of the branch serving as a protection for the sexual bodies thus far found among plumularians. The basket - shaped structures called corbuhe, which serve the same purpose in other genera, are, as Allinan has shown, modified pinnae, and not, as in Hippurella. Callicarpa, and Pleurocarpa, a branch or por- tion of a branch bearing pinnae modified to become specialized bodies with t
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