Science Record; A Monthly Magazine, Illustrated Volume 2

Science Record; A Monthly Magazine, Illustrated Volume 2

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1884 edition. Excerpt: ...House, White Mountains, N. H.--Dr. William B. Scott finds that the peculiar flattening of the spinal cord in the lampreys arises late in larval life. The third cephalic nerve arises independently, while in the embryo the dorsal roots of the spinal nerves are connected by a commissure which also connects the seventh, ninth and tenth nerves to each other, and to the spinal series. The lateral nerve is apparently derived from the commissure.--Professor Cope points out that the Wasatch group of rocks of Dr. Hayden is equivalent to the suessonian of D'Orbigny and the Cernaysienne of Lemoine to the Puerco of Cope. The terms suessonian and Puerco have priority.--Mr. C. L. Peticolas has recently ascertained that the diatomaceous deposits of Maryland and Virginia extend into Dorchester Co., Md., where an artesian boring brought up specimens from a depth of 300 feet. The forms, while of the same general character as those of Richmond and Virginia, still have their own peculiarities which distinguish them.--In a paper on the "Genera of Fossil Cephalopods" (Proc. Bost. Socy. Nat. Hist., xxii, pp. 253, et seq.) Professor Alpheus Hyatt has presented an entirely new classification of these interesting forms which is the more valuable since it is largely based upon embryological ground. The paper is too long and too condensed for presentation in abstract.--M. Vayssiere has found a minute internal shell in Notarchus and Krohn a similar structure in Gasteropteron. These shells are very minute and are regarded as persistent embryonic shells, giving some plausibility to the idea that similar shells may be hereafter found in most of the tectibranchiate molluscs.--Mr. F. W. Cragin has found the curious gregarine Lagenella mobilis parasitic in a more

Product details

  • Paperback | 82 pages
  • 189 x 246 x 4mm | 163g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236577353
  • 9781236577351