152 EMBRYOLOGY OF THE LOWER VERTEBRATES n 



wards of tin- communication hetween olfactory and buccal cavities, 

 a process which reaches its extreme in the Crocodilia \vhere the palate 

 extends hack to about the level of tin- glottis. 



STOMODAEAL GLANDS. AYhereas in the majority of Fishes the 

 stomodaeal lining po- .inly isolated gland-cells, in the air- 



breathers on the other hand there are developed definite multicellular 

 glands. These originate as a rule from solid down-growths of the 



ch. 



B 



FIG. 8:>. View of tin; roof of the mouth in three species of Lizard (A, K<i<-rnin 



B, Mabuin ijnlii'ini'liK'niiiiti ; < '. Lifijnxniini ruj'f.wiifi), illustrating the shifting back <>r 

 the communication between nose ;uid mouth. (After Voeltzkow, 1899.) 



I,, recess into which primit ivt- postrrioi naivs open ; ///, palatine; /,t, ptei-y^oid ; 



tr, 1i;insviM>r hone; i;>. VOllHT. 



Lining epithelium which develop a cavity secondarily. In I'rodeles 



then- is, as already mentioned, a special a-uiVLrat inn <>!' these glands 

 forming tin- ^land-Held in IVoiit !' lh- tongue, \\hilc ;t single -'land of 

 coiisidcralilc si/c dcVL-lojis IVoni the runl' of the mouth in the region 

 l'-l \\rcii the olfactory sacs (I nl ei-ma xillai'y or inlernasal ^land). 



In tern-stria! Ilept iles glands an- present in nnnihers mi the roof 

 of the mouth ' 1'alaline;, hrn.-at h I he loii-jiie on each side of the 

 middle; line Suhlin<nial and alon- the ed-e of the mouth just 



Hal to the iou of teeth (Labial). The poison .-land- ,ne 



and enlafjed lal-ial glands of the upper ja \\ except in 



