216 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
(c) Individual star-fish were reared under various conditions, and their growth 
recorded from time to time. 
(d) Star-fish which were regenerating lost parts were kept under various condi- 
tions, to determine the rate of growth and the rate of regeneration. 
( a and J>) On June 29 a bunch of seaweed, on which were hundreds of small stars, 
was placed in a car at the house-boat. All the stars were very small. The greater 
number were about the size of that in fig. 5, but they ranged from the size shown iu 
fig. 4, just setting on the eelgrass, to that in fig. G. 
On July 15 it was found that hundreds of stars had crawled through the wire 
netting and were thickly scattered about on the under side of the car. Here they 
had found an abundance of small barnacles, which to all appearances they very much 
relished. After preserving a few specimens, to compare with those taken from the 
seaweed, the rest of the stars were left unmolested upon the bottom of the car. The 
average size of the stars on the car was greater than the average of the larger speci- 
mens on the seaweed. This was doubtless due to the fact that the former were better 
fed. A difference in shape was also striking, those on the car being more plump. 
Figs. 7, 8, and 9 represent three specimens taken from the seaweed on this date, and 
fig. 10 one of the larger specimens (3 mm. from mouth to tip of arm) from the car, all 
natural size. The measurements which follow are all taken from mouth to tip of arm. 
Ou July 18 the stars showed a very appreciable growth. One of the larger speci- 
mens, measuring 5 mm., is represented natural size in fig. 11. 
On July 24 one of the largest measured 8 mm., and was preserved (see fig. 12). 
On July 26 one could see an appreciable growth since the 24th, and the specimen 
shown in fig. 13 measures 9 mm. In 11 days (since July 15), therefore, there has been 
an increase of 300 per cent in the length of the arm, which is equivalent to a much 
larger increase in bulk. 
The stars were taken from the bottom and put inside the car on August 1 and 
were fed with barnacles and small mussels. They had by this time eaten nearly all 
the barnacles on the bottom of the car and were doubtless iu want of food. 
On August 2 the largest specimen measured 11 mm., and is represented in fig. 14. 
Those on the bottom, however, which had left the eelgrass, were larger, some of them 
approaching the size of those on the car. 
On August 13 a box thickly covered with barnacles was split up and pieces put 
into the car. The star-fish always preferred the under side of the boards, and the 
latter were therefore placed barnacle side down. 
The stars on the eelgrass were examined on August 15 and the larger ones aver- 
aged about mm., or about the size of that in fig. 9. 
On August 18 the largest measured slightly less than 18 mm (see fig. 15). This 
specimen was afterwards kept in a dish without food, aud will be referred to again. 
On September 5 one of the largest specimens was 2G mm. in length of arm (fig. 16). 
Another measured 27 mm., and several measured 25 mm. or more. 
On September 26 the largest measured 35 mm., and is represented in fig. 17. 
On October 12 the largest found was 42 mm. (fig. 18). 
On October 25 one specimen measured 54 mm., or about 2J inches (fig. 19) ; this was 
preserved. The next largest (51 mm.), shown in fig. 19, is the largest star reared in 
captivity. It was almost exactly 4 months old, having set about June 28. The sexual 
glands were more highly developed than usual, even for larger stars at this season. 
From this date to November 11 there was no growth, but apparently a slight decrease. 
