. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. Paludestrina Jenkinsi, Smith, and P. ventrosa, Mont. 377 evident. The transverse rows of teeth are slightly more arched in P. ventrosa than they are in P. Jenkinsi ; in the former, moreover, the admedian teeth alternate with and project slightly between the central ones, whereas in the latter they are nearly in a line with, and stand clear of, the median teeth, so that the whole radula has the appearance of being more sharply divided into longitudinal areas. The contrast betwe
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. Paludestrina Jenkinsi, Smith, and P. ventrosa, Mont. 377 evident. The transverse rows of teeth are slightly more arched in P. ventrosa than they are in P. Jenkinsi ; in the former, moreover, the admedian teeth alternate with and project slightly between the central ones, whereas in the latter they are nearly in a line with, and stand clear of, the median teeth, so that the whole radula has the appearance of being more sharply divided into longitudinal areas. The contrast between the respective median teeth is yet greater. In P. ventrosa the central cusp of the rachidian is as long as half the width of the tooth, and is flanked on either side by three others, whilst the single basal denticle on each side is barely visible ; in P. Jenkinsi, on the other hand, the length of the central cusp is not more than one third the width of the whole tooth ; four or even five minor cusps flank this central one to right and left of it, and four basal denticles stand out conspi- cuously on either hand below the crest of the ^Portion of Eadula of:—A. Paludestrina Jenkinsi, Smith B. Paludestrina ventrosa, Mont. Two rows of teeth are in each case shown on the left of the median tooth in their undisturbed position. On the right the teeth of a single row are drawn apart. The remaining differences are best seen from the figures. The following brief descriptions, with approximate micro- measurements, of the radulse of these two species are founded on several specimens of Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original London, Taylor and Francis, Ltd
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