STAEFISH 101 



wards. The shreds of tissue should be removed, as their 

 decay will pollute the water. Unfertilized eggs as well 

 as those in various stages of development may, however, 

 be preserved as alcoholic specimens for inland students 

 to study. 



A large scalpel or cartilage knife, a small scalpel, fine 

 forceps, bristles, fine scissors, ten per cent, hydrochloric 

 acid, test-tube or watch-glass, hand-lens, compound mi- 

 croscope, borax carmine, and Delafield's hsematoxylin 

 will also be needed. 



Method of Examination. — Fresh specimens should be 

 placed in a large vegetable dish of sea-water, which 

 should be frequently renewed. Alcoholic material may 

 be examined in a dish or dissecting-pan containing 

 enough fifty per cent, alcohol to cover the specimen. 



MOEPHOLOGT 



External anatomy. — "With a fresh or alcoholic spec- 

 imen study 



a. Shape. — Is the shape that of a perfect star? Does 

 it have a definite number of rays? Are all of 

 the rays on a normal specimen of the same 

 shape, size, etc. ? What differences in shape 

 between the under or oral and upper or aboral 

 sides? How do you account for the extreme 

 differences in the size of the body and rays of 

 certain specimens? For the differences in the 

 number of rays? Does the animal have a head ? 

 What significance has the common name? Is 

 the animal a fish ? Is the body bilaterally or 

 radially symmetrical? 

 Draw both oral and aboral surfaces. Make outline 



