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Show 230 MR. J. H. GURNEY ON A SPECIMEN OF POLYBORUS. [Feb. 19, viewed from above, are considerably broader posteriorly than anteriorly, as in Dasypus. The olfactory lobes are large ; and the corpora quadrigemina are completely covered. The oblique sulcus on the back part of the superior surface of each hemisphere, which runs forwards and outwards, is present, as in Dasypus, but it is very short. The two other sulci are well developed, that in the frontal portion being longer than in either Dasypus or Tolypeutes. The upper or second sulcus runs from in front-near the anterior internal angle of the superior surface of the hemisphere-backwards and outwards for some distance, but not nearly as far as the posterior margin of the cerebrum, it ceasing a little behind the level of the outer extremity of the posterior oblique sulcus. In this respect it resembles Tolypeutes and differs from Dasypus (vide fig. 3). It is to Prof. Owen that we are indebted for our knowledge of the great differences between the colic caeca and female generative organs of the genera Tatusia and Dasypus. These facts, when taken in association with other characters above brought forward and referred to, may be thus tabulated:- Dasypus. Ears apart. Nipples 2. Uterus triangular External genitalia enormous. Glans penis simple Vesicula? seminales absent. Lateral colic cfeca present. Azygos lobe of lung Azyj present. Tolypeutes. Ears apart. Nipples 2. Uterus triangular. External genitalia enormous. Glans penis simple. Xenurus. Chlamydophorus. Ears apart. Nipples 2. Uterus triangular, External genitalia enormous. Glans penis simple Vesicula? seminales Vesiculse seminales absent. N o colic cssca. gos lobe of lung present. absent. N o colic caeca. Azygos lobe of lung present. Ears apart. Nipples 2. Uterus pyriform. External genitalia small in female 9 Lateral colic caeca present. Azygoslobe of lung present (Hyrtl). Tatusia. Ears approximate. Nipples 4. Uterus pyriform. External genitalia not excessive. Glans penis trilobed. Vesicula? seminales present. N o colic cseca. Azygos lobe of lung absent. Thus we may infer that the genera Dasypus, Tolypeutes, and Xenurus resemble one another more than any of them do Tatusia. Chlamydophorus, in other respects so different from them all, is like Dasypus alone in its colic caeca, like Dasypus, Tolypeutes, and Xenurus in most respects, and like Tatusia only in the shape of its uterus. 2. Notes on a Specimen of Polyboi'us lately living in the Society's Gardens. By J. H . G U R N E Y , F.Z.S. [Eeceived Jan. 17, 1878.] The Society's 'Proceedings' for 1876 contain at p. 333 a plate and a concise notice of two remarkable Polybori which were said to have been obtained in Patagonia, and which were placed in the Gardens on the 2nd of March of that year. |
