24 MORGAN. [Vor 1X. 
digestive tract — extending as far backwards as the circular 
band —has a decided yellowish-brown color that makes this 
region of the young worm quite conspicuous. The general 
color of the young worm is white, but semi-transparent, allow- 
ing the yellow of the hepatic region to be seen through the 
body walls. The digestive tube remains the same diameter 
until it reaches the bulb-like swollen end of the body, where it 
suddenly diminishes to an exceedingly narrow tube, flattened 
from side to side, connecting with the anal opening. This por- 
tion of the canal is capable of great distension to allow the 
passage of the large particles of calcareous sand. 
The oldest worm that I obtained was drawn twelve days later 
than the last. Caught on June 24 and killed on July 17—a 
little more than three weeks old. I am indebted for the sketch 
of the worm shown in Fig..1o-to Dr. E. A. Andrews. The 
preserved worm measured 26 mm. in length. The proportions 
of the body are not very different from the last stage. The 
circular band of pigment is still found, and the region posterior 
to the band is slightly the larger of the two — probably in part 
due to the relative amount of contraction. 
The digestive tract is indistinctly seen through the body 
walls as a simple tube. The tube is colored an orange yellow 
in the region in front of the circular band of pigment. 
The number of gill-slits opening to the exterior is seven. 
The gill region is much more complicated than in the preceding 
stage. In the preserved specimen a series of closely crowded 
gill-slits are found, wide in front, but each succeeding gill-slit 
smaller posteriorly. Dr. Andrews noticed at this stage the 
characteristic odor of Balanoglossus could be made out. 
BIMINI TORNARIA. 
Weldon found two sorts of Tornaria in the Bahamas, although 
in his brief notice only one of these is described. I also found 
two sorts of Tornaria, but while the one described in the pre- 
ceding section was very abundant, the second form was very 
rare. At present I have but a single individual in my posses- 
sion and from this the figure was made in Pl. I, Fig. 12. 
I have an indistinct recollection of catching another larger 
Node 
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