1218 Notes on the Chetonotus larus. 
of long fine hairs starting out near the eyes, but a little below 
them. These appear to be tactile organs, as they keep them in 
constant motion, apparently feeling around as they move about 
slowly among the débris. The posterior end of the animal is 
bifid, ending in two tapering caudal appendages which are quite 
flexible, each being composed of two segments, and with tone 
slightly expanded into a disk. | 
In the basal portion of each caudal appendage is a gani it 
= <= 
SS 
Sars ee 
Crete gr ete ee 
ee ee oe 
Chetonotus larus Ehr., magnified 750 diameters. 1, 
seen upon the side without the side spines 
when swimming they stick the caudal appendages We 
nient object and hold themselves in place, or swing te 
one side or the other as they may desire. 
The mouth opens on the underside, close to the ci | 
of the body, through a more or less hardened ring, and t 
phagus passes up vertically about one third of the as wp 
the mouth to the top of the head, where it turns sharply 
back at an angle of about 45° for about the same i 
turns again and runs horizontally towards the gate 
about one-third the length of the animal, when it expan” 
cesophageal bulb. This opens into a straight j 
runs through to the anus between the caudal a 
