150 Journal of Comparative Neurology 



epit. — epithelial cells. oln. — olfactory nerve. 



extl. — external nares. olnb. — olfactory branch from V nerve. 



ey. — eye. op. — opening of naso-lachrymal duct 



/. — frontal plate. upon lower eyelid. 



gen. — general cavity of nose. or. — origin of naso-lachrymal duct. 



gla, — glands. pap. — papilla of Jacobson's Organ. 



id. — inner larger diverticle, in larval pig. — pigment cells. 



Anura same a,sj'd. px. — premaxillary plate. 



in. — internasal cartilaginous plate. t. — thickened part of epithelium. 



intl. — internal nares. up. — upper nasal glands in Anura. 



d. — homologue of Jacobson's organ, upb. — upper cul-de-sac in adult Anura. 



same as id. 



DESCRIPTION OF PLATES V-XII. 

 Plate V, Figs. 1 to 15. 

 Series of camera drawings of cross-sections of the investmental cartilages in 

 head of adult Amblystoma punctatum. 



PLATE VI, Figs. 1-6. 



Fig. 1. Transverse section of embryo Salamandra atra, showing nasolach- 

 rymal in its origin and dorsal passage toward its emergence upon the epidermis. 



Fig 2. Camera drawing of the same, further caudad, showing the naso- 

 lachrymal duct in cross-section as it lies just beneath the epidermis. 



Fig. 3. Camera drawing of nasal cavity of Amblystoma punctatum, showing 

 entrance of naso-lachrymal duct, glands, etc. 



Fig. 4. Camera drawing of olfactory cavity of Diemyctylus viridescens, 

 showing glands and their connection with the olfactory cavity. 



* Fig. J. Camera drawing of naso-lachrymal duct of Amblystoma punctatum, 

 showing its position in the cartilaginous investment, also the histology of its 

 epithelial lining. 



Fig. 6. Camera sketch showing a portion of nasal cavity of Amblystoma 

 punctatum, showing nerve bundles in cross-section, also in longitudinal section; 

 and showing the crypts in the olfactory ganglionic layers. 



PLATE VII, Figs. 1-7. 



Fig. 1. Camera drawing of longitudinal section of nasal cavity of Ambly- 

 stoma punctatum, showing crypts, glands, external nares, etc. 



Fig. 2. End-cells, Amblystoma punctatum, illustrating the formation of the 

 so-called moniliform supportive cells; a, true olfactory (sensory) cells, b, sup- 

 portive cells. 



Fig. j. Camera drawing of longitudinal section of nasal cavity of Diemyc- 

 tylus viridescens, illustrating the corrugations and crypt-like involutions of the 

 olfactory epithelium. 



