692 



GREENE. 



EXPLANATION OF PLATE XXXVIIL 



Figs, i and 2. Lateral and ventral view of the lines of phosphorescent organs 

 and lateral-line organs in the adult of Porichthys notatus. The representation of 

 organs is diagrammatic. Small circles show the location of phosphorescent organs, 

 and the dots the lateral-line organs. I am indebted to my friend, Edward Hughes, 

 for the outlines upon which these two figures are constructed. 



a anal. 



br branchiostegal. 



ca caudal. 



d dorsal. 



d ac dorsal accessory. 



fr frontal. 



ga gastric. 



ga gu gastro-gular. 



gti gular. 



la lateral. 



/ op lower opercular. 



ma malar. 



VI d mandibular. 



mx maxillary. 



ol occipital. 



op m operculo-mandibular. 



pi pleural. 



sc scapular. 



sc ac scapular accessory. 



stip o supraorbital. 



t temporal. 



u op upper opercular. 



V ventral. 



Fig. 3. Lines and canals on the head. For explanation, see Figs, i and 2. 



Figs. 4 to 24 are drawn with camera lucida. Figs. 4 to 8 represent the 

 structure of adult phosphorescent organs, and Figs. 9 to 24 show the stages in 

 the development of the phosphorescent organs of Porichthys notatus. The 

 orientation of each organ with reference to the dorso-ventral plane of the fish is 

 indicated by a short arrow pointing ventrally. Every section of epidermis shows 

 numerous large mucous cells, many of which are empty. 



Fig. 4. Cross-section of an adult organ in a new Porichthys from Panama. 

 The gland shows several capillaries, all in cross-section but one. /, lens ; gl, gland ; 

 r, reflector ; /, pigment ; bl, blood vessel. 



