. Elements of zoölogy : a textbook. Zoology. DORSIBRAKOHIATA. 377 (Fig. 510) has recently been described and figured by Professor Verrill.* FIG. Marine Worm, Cirratultis grandis, Verrill. * Cirratulus is grouped with the Dorsibranchiata of Siebohl. But Pro- fessor Verrill writes me that he does not recognize Dorsibranchiata as a nat- ural group, but merely au artificial one. " The long, slender organs on the nicies of the body of Cirratulus are the dor- sal cirri, and are not homologous with the branchiae of Arenicola, etc., though they may, and doubtless do act to some extent as br
. Elements of zoölogy : a textbook. Zoology. DORSIBRAKOHIATA. 377 (Fig. 510) has recently been described and figured by Professor Verrill.* FIG. Marine Worm, Cirratultis grandis, Verrill. * Cirratulus is grouped with the Dorsibranchiata of Siebohl. But Pro- fessor Verrill writes me that he does not recognize Dorsibranchiata as a nat- ural group, but merely au artificial one. " The long, slender organs on the nicies of the body of Cirratulus are the dor- sal cirri, and are not homologous with the branchiae of Arenicola, etc., though they may, and doubtless do act to some extent as branchiae. But they are more particularly devoted to sensation nncl locomotion. Some of the moat anterior ones, however, are different in structure from the rest, though similar in form, and are regarded as true ;—Verrill. Professor Verrill writes me that he recognizes two Classes of Worms :— I. ANNELIDA, including six orders, viz. : 1. Chsetopoda, 2. Oligochseta, 3. Gephyrea, 4. Bdellodea, 5. Gymnocopn, 6. Chaetognatha; and II. SCOLECIDA, including six orders, viz.: 1. Nematoidea, 2. Tnrbellaria, 3. Trcmatoda, 4 Acanthocephala, 5. Cestocla, 6. 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 Tenney, Sanborn, 1827-1877. New York : Scribner
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