Ritrer. — Eyes of Typhlogobius calif. 
Fig. 
24. 
25. 
26. 
PLATE IV. 
Rods from the same eye as the preceding (Fig. 21); a’, b’, outer mem- 
bers; a”, 6”, inner members ; c, portion of outer member showing the 
more transparent round spots. > 720. 
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. > 720. 
Section of another papilla of the same series, same specimen as the pre- 
ceding. XX 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. 
Diagram showing the arrangement and relative size of the papillae found 
on the right side of the head of a specimen 19 mm. long. 
Section of a papilla of the median lower-jaw series of Lepidogobius. 
x 340. 
