Nemerteans / by Wesley R. Coe. Bryozoans / by Alice Robertson.

  • Wesley Roswell Coe
Date:
[1910]
Catalogue details

Licence: In copyright

Credit: Nemerteans / by Wesley R. Coe. Bryozoans / by Alice Robertson. Source: Wellcome Collection.

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    2. Color brown or chocolate with numerous narrow, transverse white rings and five parallel, longitudinal white lines, of which one is in the dorso- median line, and two on each lateral surface C. dinema, p. 15. 3. Color brown with numerous narrow transverse rings and three parallel, lon- gitudinal white lines of which one is in the dorso-median line and one just below each lateral margin C. capistrata, p. 16. Order MESONEMERTEA. A. Body musculature consists of a thin outer circular layer and a strong inner longitudinal layer — an inner circular layer is usually wanting entirely, or, if present, is much reduced. Body long and filiform, often coiled in a close spiral. Head sharply pointed. Mouth placed very far behind the brain. Neph- ridia not discovered Cephalothrix, p. 19. 1. Slender, filiform, pale yellow, sometimes with reddish, grayish or greenish tinge. No ocelli in adult C. linearis, p. 19. AA. Body musculature consists of a thin outer circular layer, a diagonal layer, a longitudinal layer, and, in the esophagal re- gion, an additional, enormously developed inner circular layer. Head broader than neck. Nephridia well developed. Carinoma, p. 20. 1. Body rather stout, flattened posteriorly. Mouth close behind brain. Milk- white with grayish or brownish mottlings, and darker intestinal lobes. C. griffini, p. 20. Order METANEMERTEA. A. Body long and slender. Proboscis sheath usually less than half the length of body. Proboscis small; central stylet usually small Emplectonema, p. 23. 1. Stylets slender, curved. Dark green or pale green above, and whitish or very pale greenish below E. gracile, p. 23. 2. Stylets straight and short, with swollen bases. Basis of central stylet swollen and rounded posteriorly. Dark brown above, flesh-color be- neath E. biirgeri, p. 25. AA. Body moderately elongated. Proboscis sheath about y2 to ^ the length of body. Central stylet well developed. Paranemertes, p. 32. 1. Two or 4 pouches of accessory stylets. Color purplish brown, dark-brown, or orange-brown above, on sides, and on lateral margins of ventral sur- face; rest of ventral surface (often only the median third) white or yellowish white P. peregrina, p. 33. 2. Four pouches of accessory stylets. Opaque white P. pallida, p. 36.