The Anatomy of Nautilus Pompilius

The Anatomy of Nautilus Pompilius

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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. 1900 edition. Excerpt: ...band. The band is about 3 millimeters in width. Some of the older septa show a minute cup-like backward projection at the middle of their inner edge. (Fig. 1.) These depressions in the faces of the septa can be traced, constantly less developed, to the newest septum. In this it is only a notch in the extreme edge of the septum, into which the projection of the dorsal aponeurotic band just mentioned fits. From this it would seem that in young specimens there is a projection of the mantle corresponding to the depression in the septum, which has been gradually reduced until in the adult it remains only as a point at the middle of the dorsal aponeurotic band. The ventral ends of the columella!-aponeurotic areas are connected by the anterior ventral aponeurotic band, which extends over the ventral surface of the body. (Fig. 1, AV.) This is also Tbxt-fig. 7.--Outlines of the areas of attachment of the shell muscles and aponeurotic bands to the shell spread out flat. The outline of the septal area has been drawn from a wax model. AVAB, anterior ventral aponeurotic band. PVAB, posterior ventral aponeurotic band. DAB, dorsal aponeurotic band. SA, septal area. S, siphon. SM, Bhell muscle. about 3 millimeters in width. A third aponeurotic band, the posterior ventral aponeurotic band, connects the dorsal ends of the columellar aponeurotic areas, extending also around the ventral surface of the body. (Fig. 1, PV.) As the body is curved the actual position of the ventral surface is posterior. The last band is only one-third as wide as the others. It is drawn somewhat too wide in Fig. 1. The posterior ventral aponeurotic band first passes directly backward from the end of the columellar aponeurotic area parallel to the dorsal edges of the body. It then makes a...show more

Product details

  • Paperback | 68 pages
  • 189 x 246 x 4mm | 141g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236647041
  • 9781236647047