BY T. HARVEY JOHNSTON AND OTTO S. HIRSCHFELD. 75 
the ventral lobe of the liver. In young specimens (text- 
figure 1) it then bends backwards to travel between the 
straight intestine and the first loop, or else above the straight 
intestine (¢.e., on the left side of the ccelome). It then 
crosses above the latter to travel obliquely forward to 
terminate at the arms on the right side. In adult animals 
(text-figure 3) the intestine appears to have elongated to a 
much greater extent than the ccelome and as a consequence 
has become thrown into a pronounced loop which is barely 
indicated in young specimens. The tube after reaching the 
vicinity of the liver forms a large open loop extending 
dorsally into the right side of the ccelome above the 
straight intestine and commonly above the rectum also, 
returning to the left side to form another loop before con- 
tinuing as the rectum which has the same relative position 
asin young animals. The coiling of the intestine resembles 
that described by Gratiolet for L. hians (fig. 19, p. 138) 
rather than that figured for L. anatina (Woodward), and 
L. affinis (Hancock, pl. 65, fig. 4). In these two species 
the loops are closer, the coils forming a loose ball. In the 
adult of L. bancrofti the coiling is intermediate between 
the condition seen in L. hians and L. anatina. 
The intestine, stomach and gastric glands of several 
small specimens which had been cleared and mounted were 
found to be filled with the valves of a number of different 
genera of diatoms. The contents of the posterior half of 
the intestine were arranged in more or less rounded fecal 
pellets in which diatoms could be seen. 
In a young decalcified specimen in a position similar 
to that in which Morse found an otocyst in L. lepidula 
(pl. 47, figs. 5 and 6) we observed a small spherical organ 
0.15 mm. in diameter. This otocyst was situated just 
behind the occlusor and laterally from the stomach. Morse 
noted its presence in L. anatina also (p. 348) but mentioned 
that he had not been able to see them in any Lingulas 
preserved in alcohol. We observed them in only two out 
of several submitted to microscopical examination. 
The gonads are obvious structures in adults but are 
not recognisable in our smallest specimens. They occupy 
