142 



DR. 0. P. SONNTAG ON THE ANATOMY 



division of the dorsum. A clear line of demarcation, which is 

 concave forwards, separates the two groups. This arrangement 

 was also described in my paper on the tongues of the Lemu- 

 roidea (29). The forms are shown in text-fig. 17, 1-6 and 12-15. 



Lateral Organs : — Various authors have described them in 

 Canis familiaris (23), G. lupus (5), C cinereo-ay'gentattis (31), 

 C. mesomelas (31), G. j'ubatus, Vulpes vulpes, V. leucopus, and 

 V. fvhms. In Ga^iis familiaris they are variable, being present 

 in some specimens, but absent in others. Authors have described 

 the histology of these structures in that species. In the speci- 

 mens at my disposal I found organs in some specimens of Ganis 

 familiaris, but not in others. 



In the specimens at my disposal I found the organs always 

 very slightly developed when present. No traces were present 



Text-figure 22. 



'■KM. 





/V Canis mesome/3s. 



Crosssrchus o6sct/rus. 



The tongues of the Viverridse (No. 2), Canidce, and Pvocyonida> (No. 1). 



Cercolsptec 

 ci'udivolv'/lus. 



in G. lupus, G. mesomelas, G. jiohatus, Vul2}es vulpes, V. leucopus, 

 V.fulvus. But they were present in all other Canidse enume- 

 rated in this paper. 



Glands : — In the dog and common fox serous glands surround 

 the vallate papillae and la.teral organs, and mucous glands cover 

 the base of the tongue. But there is no apical gland of Nuhn. 

 Lymphoid nodules and orifices of ducts and pits are scanty on 

 the base of the tongue. 



The frenum is well marked, but there are no traces of fre'nal 

 lamellae, plicae fimbriatse, and foramen csecum. The median 

 glosso-epigiottic fold may run forwards for a considerable distance 

 on to the pharyngeal part of the tongue and separate the conical 

 papillae into two groups. 



