230 MR. J. H. GURNEY ON A SPECIMEN OF POLYBORUS. [Feb. 19, 



viewed from above, are considerably broader posteriorly than an- 

 teriorly, 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. 

 Glana penis simple. 



Tolypeutes. 



Xenurus. 



Ch lamydopkorus 



Ears apart. (Ears apart. 



Nipples 2. iNipples 2. 



Uterus triangular. Uterus triangular 

 External genitalia External genitalia 



enormous. enormous. 



Glans penis simple. Glans penis simple 



Vesiculse seminales 



absent. 

 Lateral colic caeca 



present. 

 Azygos lobe of lung Azyg 



present. 



Vesiculae seminales 



absent. 

 No colic cseca. 



Vesicula? seminales 



absent. 

 No colic caeca. 



os lobe of lung Azygos lobe 

 present. present. 



Ears apart. 

 Nipples 2. 

 Uterus pyriform. 

 External genitalia 

 small in female. 

 ? 



Lateral colic caeca 

 present, 

 of lung Azygos lobe of lung 

 present (Hyrtl). 



Tatusia. 



Ears approximate. 

 Nipples 4. 

 Uterus pyriform. 

 External genitalia 



not excessive. 

 Glans penis tri 



lobed. 

 Vesiculae seminales 



present. 

 No 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. 

 Chlamydop/iorus, 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 Polyborus lately living in the 

 Society's Gardens. By J. H. Gurney, F.Z.S. 



[Keceived Jan. 17, 1878.] 



The Society's 'Proceedings' for 18/6 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. 



