Notes and Reports Volume 15-23

Notes and Reports Volume 15-23

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1922 edition. Excerpt: ...pass transversely across the mastax to the dorsal ends of the rami; they are imbedded in the walls of the mastax and support them during the pumping action. Two well developed ventral salivary glands are present; the right gland is considerably larger than the left. The oesophagus is unusually long and slender. The gastric glands are small and rounded. The stomach and intestine are not distinctly separated. The ovary is large and ovate in outline. A normal bladder is present. The foot glands are long and slightly club-shaped. The ganglion is small and saccate. The retrocerebral organ consists of a small, clear sac and two subcerebral glands, as large as the sac. Neither glands nor sac contain bacteroids. The eyespot is large and at the posterior end of the ganglion; two pigment spots or accessory eye-spots are situated on the corona, immediately under the integument, near the openings of the ducts of the retrocerebral organ. Total length 350-4:00p.; toes 35-40;; trophi 50,1. Eothinia elongata is not very common; we have collected it in small numbers at Lac Vieux Desert, Vilas County, Three Lakes, Oneida County, Wisconsin, and at Four-mile Run, in Virginia, near Washington. It is necessary to create a new genus for this species, as the mastax is entirely dilferent from the normal Eosphora, -type; the great dissimilarity in external form between Eothinia elongate and Sphyrias lofuana prevents its being referred to the latter genus. No'r1-: s on COLLECTING AND MOUNTING ROTIFERS The methods for collecting the limnetic rotifers living away from plants in the larger bodies of water are very simple; either a throwing or a dip net will do. It is necessary to have it made of material sufficiently thin to allow the water to pass through, and at...show more

Product details

  • Paperback | 122 pages
  • 189 x 246 x 7mm | 231g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236739353
  • 9781236739353