253 
253 
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iv CONTENTS. 
No. 11. — On some Young Stages in the Development of Hippa, Porcellana, 
and Pinnixa By W. Faxon. (5 Plates) . ۰ ۰ ‘ e " 
Hippa ۰ ۰ ۰ ۰ . 
Porcellana ۳ 7 " i ۰ P , ‘ . 
—-——: Bibliography . ۰ . ۰ ۰ . . ۰ . 
Pinnixa A ‘ " , " 
No. 12. — Reports on the Dredging Operations of the United States Coast 
Survey Steamer * Blake." IV. Preliminary Report on the Worms. By 
Proressor Ernst EnunEns of Gottingen 
No. 18. — On the Classification of Rocks. By M. E. WADSWORTH 
No. 14. — Letter No. 3 to C. P. Patterson, Superintendent United States Coast 
Survey on the Dredging Operations of the United States Steamer “ Blake." 
By A. Acassiz. (2 Maps) 
No. 15.—On the Development of Palemonetes Vulgaris. By WALTER 
Faxow. (4 Plates) é : K 
No. 16. — On the Jaw and Lingual Dentition of certain Terrestrial Mollusks. 
Jy W. G. BINNEY. (2 Plates) . ۰ ۰ ۰ . ۰ 
