

[AETICLE 15.— EXTRACTED FROM THE BTTLLETrN' OF THE V. S. FISH COMMISSION 

 FOR 1890. Pages 389 to 436. Plates LXXIX to XCIV.] 



A 



CONTRIBUTION TO OUR KNOWLEDGE ^^°°'^n£^'^ 



OF THE 



Morphology of Lamellibranchiate MoUusks. 



BY 



JAIVEES Iv. KELLOQG. 



WASniXGTOX: 



GOVERNMENT PRINTING OFFICE. 

 1892. 



