Cretaceous Fauna of Southern India (Paperback)

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. 1873 edition. Excerpt: ... apparently rare. For-mati0n.--Arrialoor group. The species of this genus are distinguished from allied C'Ass1D ULIDE by a usually moderately depressed ovate form, being rather narrow in front and gradually broader towards the posterior, generally rounded, end; the apex is eccentric, anterior, the two posterior ambulacra often somewhat longer than the anterior, and all extend nearly to the peripherical edge of the test; the pores in each pair are unequal and yoked; the anus lies at the posterior end, and is vertically ovate; mouth eccentric, pentagonal, surrounded by more or less distinct lobes, alternating with the elongate oral ambulacra. With one or two exceptions, all the species as yet known are from cretaeeous deposits. Bornrorreus sp. indet. Pl. IV, Fig. 6. I mention under this name a very imperfectly preserved specimen of a O'assiduZ-id which appears to belong to the present genus. The test is ovate, broader posteriorly than anteriorly, moderately depressed, with arounded periphery; the apex is anteriorly eccentric, and somewhat raised above the other parts of the test, as in some species of Faujasia or Archiacia; the two posterior ambulacra are very much longer than the three anterior, which appear to be sub-equal; the pores are yoked, but appear to be nearly equal; the anus is vertically elongated, ovate; it lies at the posterior end, on about the level of the middle height of the test. The aperture is very much anterior from the centre; it appears to be irregularly pentagonal, slightly broader than long; but, as the superficial part of the shell is entirely removed, it is not seen whether any lobes were present or not. On the upper side the entire surface of the test is also very much worn ofl', and hence the difliculty in...