94 MARY J. ROSS. 



the surface cells. These then become united - -forming at their 

 junction the neck of the gland. So far all three forms agree. 

 But in the pig the epithelial cells multiply and project into the 

 cavity of the stomach to form ridges, supported by mesodermic 

 outgrowths. On these ridges and in the pits between them are 

 found the glands just described. They are lengthened by a 

 further outgrowth of the epithelial cells about their lumen, also 

 supported by connective tissue cores, and a slight clowngrowth of 

 the gland proper into the connective tissue beneath. In this way 

 the excretory ducts are formed secondarily in the pig. These 

 round or " ovoid " cells are not characteristic of any one region, 

 but are found over the entire surface of the stomach in all three 

 cases, wherever glands are to be formed. They are specialized 

 very early, as they maybe seen in Desmognathits and Amblystoma 

 before the whole stomach is yet fully formed. 



BIBLIOGRAPHY. 

 Baginsky, A. 



'82 Untersuchungen iiber den Darmkanal des Menschl. Kindes. Virchow's 

 Archiv, Bd. 89, 1882. 



Bensley, R. R. 



'oo The cesophageal glands of Urodela. Biological Bulletin, Vol. II., No. 3, 

 Dec., 1900. 



Brand, E. 



'77 Beitriige xur Entwicklung der Magen and Darmwand. Diss. Wtirzburg, 



1877. 



Cade, A. 



'01 Les Elements secreteurs des glandes gastriques du fond chez les mammiferes. 

 Archives d' Anatomic Microscopique, Vol. 4, 1901. 



Carlier, E. W. 



'99 The Newt's Stomach during Digestion. La Cellule, Tome XVI., 1898. 



Eisler, P. 



'85 Zur Histologie der Magenschleimhaut. Halle, 1885. 



Gar el. 



'79 Glandes de la muqueuse intestinale et gastrique des Vertebres. Thesis. 

 Paris, 1879. 



Greenwood, M. 



'84 Observations on the Gastric Glands of the Pig. Journ. of Physiol., V. , 1885. 



Griffini, L., und Vassale, G. 



'88 Ober die Reproduktion der Magenschleimhaut. Beitrage zur Pathol. Anat. 

 u. zurallgem. Pathol., III. Bd., 1888. 



Krazowski, V. 



'80 Untersuchungen iiber die Entwicklung des Omasus. Inaug. Diss., Dorpat, 

 1880. 



