17-! SUMMARY OF CURRENT RESEARCHES RELATING TO 



have a Long-headed, heavily built variety with a straight profile, and a 

 long-headed heavily built variety with a more or less pronounced Roman 

 nose. 



In addition to several occidental varieties, there are several African 

 and oriental varieties ; and, in as far as the English thoroughbred is a 

 mixture of African and oriental varieties and of occidental light and 

 heavy varieties, it might be cited as an excellent example of a breed 

 which includes amongst its ancestors several wild species — a breed which 

 has had a multiple origin. 



Phylogeny of Mammalian Tongue.* — J. Tokarski has made some 

 observations on the comparative anatomy of the tongue in Nasua 

 socialis, Phascologale flavipes, Halmaturus iialabatus, Fells catns, etc.. 

 As a result of his inquiries he concludes that the muscular tongue, 

 together with a part of its supporting organ, has been separated off in 

 its whole length from the lower tongue. This was necessitated as 

 muscular elements became more numerous, on account of the hindrance 

 to free movement caused by the processus ento-glossus. Before this took 

 place there was formed, from the original perichondrium of the processus, 

 a perpendicular wall of division, which formed a support for the trans- 

 verse musculature, the septum linguas. In many cases this represents a 

 direct continuation of the lyssa capsule. Oppel's statement that the 

 lyssa must be considered in many animals as a neomorph, on account of 

 the absence of rudimentary tissues, is probably incorrect. 



Anatomy of Notoryctes Typhlops.j — G. Sweet discusses the ana- 

 tomy of the organ of Jacobson and associated parts, claiming that they 

 afford evidence of a close affinity of this Polyprotodont with the Dipro- 

 todonts by way of JEpyprymnus and Petaurus, and also, though at a 

 much greater distance, with the Edentates and Rodents. Corroborative 

 evidence is afforded by the iliac arteries. 



Copulatory Organs in Mammals.:]: — Ulrich Gerhardt has made 

 a comparative study of the mammalian penis, and shows its remarkable 

 specialisation in various types, which is apparently correlated with the 

 effective discharge of its function in the coitus. 



British Mammals.§ — J. G. Millais has completed Volume I. of a 

 magnificent work on British Mammals, which includes a wealth of beau- 

 tiful illustration and a full account of habits and distribution. It is the 

 work of one who is fortunate in combining the qualities of artist and 

 naturalist. The first volume relates to the Chiroptera, Insectivora, and 

 Carnivora (exclusive of Mustelidas). 



Catalogue of Canadian Birds.)] — John Macoun completes his cata- 

 logue, which brings together all the available knowledge of the distri- 

 bution and the breeding habits of Canadian birds. The third part 



* Anat. Anzeig., xxv. (1904) pp. 121-31. 

 t Proc. Roy. Soc. Victoria, xvii. (1904) pp. 70-111 (4 pis.). 

 X Jenaische Zeitschr. f. Naturwiss., xxxix. (1904) pp. 43-118 (1 pi.). 

 § The Mammals of Great Britain and Ireland. By J. G. Millais. Vol. I., pp. 

 xx. and 303 ; illustrated. London (1904). 



|| Geol. Survey of Canada (1904) pp. 415-733, and xxiii. pp. of Index. 



