A Monograph of the Fossil Echinoidea of Western Sind & the Coast of Bilúchístán from the Tertiary Formations

by P. Martin Duncan

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. 1882 edition. ...of the posterior margin, part being above and part below the rounded angle formed at the junction of the vertical posterior end and the actinal surface. The space enclosed is large and sub reniform in outline, and the upper part of the fasciole dips down with a rather deep Three pairs of pores reentering curve, pointing downwards, in the median line. belonging to the posterior zone of the posterior petals are included within the fasciole, and mark its lateral boundaries. The presence of a peripetalous fasciole is very doubtful. In none of the specimens is the delicate ornamentation of the test within the region of the petals sufficiently well preserved to enable this point to be settled. In one of the specimens which has some portions fairly well preserved an arrangement of granulation may be observed at the extremity of the antero-lateral petal, and extending for a short distance close along the posterior margin of the groove, which is rather suggestive of a fasciole. There is also a slight tumidity on one of the plates about midway on the anterior margin of the posterior petal, which might possibly indicate the line of direction taken by the supposed fasciole in crossing the postero-lateral interradium; but no actual band is discernible. The strip of granulation above referred to is, however, somewhat ill-defined, and wanting in compactness--a fact which, together with the inability of finding any trace of the fasciolestructure elsewhere, leads us to entertain very great doubts as to the presence of a second fasciole in the Spatangoid under notice. Remarks. This very interesting form is readily distinguishable either from its congeners or any species with which we are acquainted. At first sight it strongly suggests the outline of...

166 pages, Paperback

Published September 13, 2013

About the author

Peter Martin Duncan FRS (20 April 1821 – 28 May 1891) was an English palaeontologist.

He was the father of zoologist Francis Martin Duncan