﻿12 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 59 



by a tube formed of the ciliated antennules, and forced out of the gill 

 chamber at the sides of the body, or under other conditions the cur- 

 rent may be reversed. 



5. There is a constant difference in the size of the male and female ; 

 in twenty-seven specimens of each the former averaged 12.4 mm. and 

 the latter 21.4 mm. 



BIBLIOGRAPHY 



Albert, Friedrich. 



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1850. On the Carcinological Collections of the United States, etc. Proc. 

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1879. Revision of the Hippidea. Journ. Linn. Soc. London, Vol. 14, p. 312. 



