KiTTER. — Eyes of Tjphlogobius calif 



PLATE IV. 



Fig. 22. Rods from the same eye as the preceding (Fig. 21) ; a', b', outer mem- 

 bers ; a", b", inner members ; c, portion of outer member showing the 

 more transparent round spots. X 720. 



" 23. Section of a tactile papilla from the median lower-jaw series of a specimen 

 about 50 mm. long. The section is not quite parallel to the long axis 

 of the papilla, and this accounts for its appearing not to extend fully 

 through to the deep surface of the epidermis. X 720. 



" 24. Section of another papilla of the same series, same specimen as the pre- 

 ceding. X 350 about. 

 Note. — The leader from va. sng. has neither the right direction nor 

 sufficient length to reach the blood-vessel in the axis of the papilla. 



" 25. Diiigram showing the arrangement and relative size of the papillse found 

 on the rigiit side of the head of a specimen 19 mm. long. 



" 26. Section of a papilla of the median lower-jaw series of Lepidoijobius. 

 X 340. 



