A History of the British Sessile-Eyed Crustacea Volume 1

A History of the British Sessile-Eyed Crustacea Volume 1

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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. 1863 edition. Excerpt: ...We are, however, much inclined to consider it as only a variety of Montagu's species, and it will be for future observation to determine whether the absence of a small denticle, and other peculiarities noticed above, are of specific importance. The accompanying vignette represents a cutter and steamer: the former probably with some naturalist on a dredging expedition. DEXAMINE VEDLOMENSIS. N. S. Specific character. Last segment of the pereion, as well as the first four of the pleon, dorsally carinated, and posteriorly elevated into a large tooth. Peduncle of the inferior antennae with the last two joints very long, and of equal length. Length inch. This species has the head produced anteriorly between the antennae into a small process; a similar but still smaller process projects upon the lateral margin, just in front of the eye, between the upper and lower antennae. The anterior segments of the body are smooth, but the sixth exhibits a rudimentary central dorsal tooth, which is increased to a considerable extent in the seventh segment, at once distinguishing the present species from its congeners. As in D. spinosa, the four anterior segments of the tail are dorsally carinated, and posteriorly elevated into a tooth. The fourth segment is, moreover, distinguished by a very deep dorsal sinus, the anterior wall of which projects backwards, in the form of a small tooth. The eyes are oval. The superior antennae have the first joint of the peduncle nearly as long as the head, and armed at the infero-distal extremity with an acute tooth; the second joint is more slender than the first, and about half as long again: the flagellum is long and slender. The inferior antennae have the penultimate joint of the peduncle reaching as far as the middle of...
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Product details

  • Paperback | 108 pages
  • 189 x 246 x 6mm | 209g
  • United States
  • English
  • black & white illustrations
  • 123683786X
  • 9781236837868