1909.] ox THE STRUCTURE OF THE LESSER AXTEATER. 683 



of the higher Eiitherian types had been speciahsed. If the 

 Orycteropus line ever coincided with that of Dasypus the two 

 must very early have diverged. 



My thanks are due to Dr. Peringuey for the specimen, and to 

 Prof. Graham Kerr for the use of his laboratory while making 

 the sections. 



References to Literature. 



R. Brooji. — " A Contribution to the Comparative Anatomy of the 

 Mammalian Organ of Jacobson." Tr. Roy. Soc. Edin., 1898. 



R. Broom. — " On the Comparative Anatomy of the Marsupial 

 Organ of Jacobson." Proc. Linn. Soc. N. S. W., 1897. 



EXPLANATION OF PLATE LXXI. 



Fig. 1. Transverse section of snout of Orycteropus afer. X 5. 



Fig. 2. Transverse section of Organ of Jacobson of Oryeteroptis afer. X 40. 



Figs. 3-6. Transverse sections of lower part of snout of Orycteropus afer. X 7. 

 a., arter3- ; g., gland; ^r.fZ., gland-duct ; i.t., inferior turbinal; J.c, Jacobson's 

 cartilage; J".o., Jacobson's organ; 7.(i., lacbr^'uial duct; Z._(/.?'., lower glandular ridge; 

 J/j-., maxilla ; m., nerve ; iVa., nasal ; m.jo.c, naso-palatine canal ; m.s., nasal septum ; 

 o.h.J.c, outer bar of Jacobson's cartilage; JPinx., premaxilla ; p.Pmx., palatine pro- 

 cess of premaxilla; r.u.t., rudiuientarj^ upper turbinal; u.g.r., upper glandular 

 ridge ; Vo., vomer. 



2. On some Points in the Structure of" the Lesser Anteater 

 (^Tamandua tetradactyla), with Notes on the Cerebral 

 Arteries of Myrmecophaga and on the Postcaval of 

 Orycteropus. By Frank E. Beddaed, M.A., F.R.S., 

 F.Z.S., Rro sector to the Society. 



[Received May 20, 1909.] 



(Text-figures 218-225.) 



In April of the present year I dissected an example of this 

 Edentate in which the blood-vessels were filled with blood, and 

 which was so little diseased that all the viscera and their con- 

 necting ligaments were in a j)erfectly normal state. The excellent 

 condition of the animal led me to take comprehensive notes con- 

 cerning the princijDal viscera ; and as there are still some lacunae 

 in the published accounts of the anatomy of this little Anteater, 

 and a few organs have not, so far as I can ascertain, been examined 

 at all, I have prepared a short account of such facts as appear to 

 me to be new. Although the anatomy of Tamandua has not up 

 to the present been exhaustively studied, we are in possession of a 

 good deal of knowledge concerning its structure. Duvernoy *, 



* Mem. Soc. Hist. Nat. Strasbourg, 1830, vol. i. This memoir is only descriptive 

 of the tongue of Tamandua (and of the tongues of some other animals, e. g., Ecliidna, 

 CliamtBleon). 



