Prof. J. C. Schiodte on Buprestidic and Elateridse. 173 Anitnal white ; tentacula fifty to fifty-four. Calyx festooued. Statoblasts elliptical, yellow, with a narrow blackish ring dividing the cell from the narrow purple rira or annulus which surrounds it. The cell is beautifully reticulated externally. Two out of the three statoblasts observed had a slight constric-tion on one side, which gave them a slightly reniform outline. Habitat. On an old valve of Anodon cygneus, in the canal, Exeter, June 23, 1866. This appears to be a very distinct species, and is allied or, rather, belongs to that section of the genus to which P. emar-ginata belongs, viz. with a line or ridge along the upper part of the diaphanous tube. But the line of demarcation between the diaphanous portion of the tube in this species and the thick opake walls of the inferior half gives it, even at first sight, a very dis-tinct and marked appearance. Another striking peculiarity is that the tubes grow mostly in pairs, and are very closely adhe-rent to the matrix, except the polype-cell, which stands up con-spicuously near the end of the tube. Length of the coenoecium 10 lines. EXPLANATION OF PLATE XIL Fig. 1. Plumatella lineata : coenoecium, nat. size, or 2 inches in its longest diameter. Fig. 2. A portion of the same, enlarged, showing the animals protruded, and one partly withdrawn within its cell. Fig. 3. Statoblast. Fig. 4. Plumatella Limnas : coenoecium, enlarged. Fig. 5. Polype-cell, showing its position at the end of the tube. Fig. 6. Showing the true polype-cell within the ectocyst. Fig. 7-The polype expanded. Fig. 8. Statoblast. XXIX. — On the Classification o/ Buprestidse and Elateridse, with special regard to the Danish Fauna. By Prof. J. C. Schiodte*. I. By the well-known and valuable researches of Eschscholtz (pub-lished in Thongs * Entomologisches Archiv,' ii., and in Silber-mann's 'Revue Entomologique,' vol. iv.) attention was drawn to a great number of hitherto unobserved points in the external structure of Elateridse, on which he founded an artificial classifi-cation of that family; and since then, the remainder of Latreille's Sternoxi have been subjected by other entomologists to an ana-logous examination, resulting in the establishment of more than * Translated from ' Naturhistorisk Tidsskrift,' ser. 3. vol. iii. Copen-hagen, 1865. Accompanied in the original with a plate representing the organs of the mouth.
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