HEART AND ANTEEIOR AETERIES 11^ MONSTERS OF THE 



DICEPHALUS GROUP; A COMPARATIVE STUDY OF 



COSMOBIA.i 



Bt 



MABEL BISHOP, 



Fellow ill Zoology, Smith College, 1907-1908. 



With 7 Plates and 5 Text Figures. 



Outline. 

 I. Introduction. 



Investigation of monsters, hitherto descriptive. 



Comparisons now needed. 



Definition of "Cosmobia." 



Purpose of the present investigation. 



II. Material studied. 



A. Young normal pig, lamb, and turtle. 



B. The following terata : — 



(a) Pig foetus at term, Teras XII. 

 (&) Pig embryo, 22 mm., Teras I. 



(c) Dicephalous lamb, 3 to -i weeks old, Teras XY. 



(d) Two-headed turtle, just hatched, Teras XX. 



III. General description of each Teras, including comparison with 

 human monsters of similar type as represented in well-known 

 atlases. 



lY. Detailed description of the Heart and Anterior Arteries in each 

 Teras. 



^\ thesis siibniitted to the Faculty of Smith College in partial fulfillment of 

 the requirement for the degree of Master of Arts, May 20, 1908. 



The Amekican Jolkxal of Anatomy. — Vol. VIII, Ko. 4. 



