OF CONCHOLOGY. 299 



MONOGRAPH OP THE FAMILY STREPOMATIDiE. 



BY GEORGE W. TRYON, JR. 



The following pages of condensed descriptions are extracted 

 from a much more extended paper, prepared for, and to be 

 published by the Smithsonian Institution as one of its series 

 of conchological works, forming a part of the "Smithsonian 

 Miscellaneous Collections." To Prof. Joseph Henry, its able 

 Secretary, we are much indebted for the privilege of using the 

 numerous wood cuts intended for the illustration of the forth- 

 coming work. It has not been deemed necessary to make any 

 bibliographical references in this paper, as these, together with 

 our views respecting synonymy, are very fully entered into 

 in our "Synonymy of Strepomatidoe," first published in the 

 "Proceedings of the Academy of Natural Sciences, Philadel- 

 phia," 1863, '64, '65, and afterwards separately in an octavo vol- 

 ume." We have, therefore, confined ourselves to the citation 

 of the specific name adopted by us in the above-mentioned 

 work, and the current number of the species as contained 

 therein, the latter for facility of reference. 



The intention of the present paper being principally to 

 facilitate the determination of specimens, the species have 

 been grouped in such manner, as to render this attainable with 

 the least possible trouble, and the descriptions are made as 

 brief as possible, consistent with the delineation of the promi- 

 nent distinctive features of the species. 



Our paper, entitled "Observations on the Family Strepoma- 

 tida3," published in the 2nd No. of this Journal, may be con- 

 sidered as an introduction to the present one, and, as the ana- 

 lytical table of genera contained in the former will serve to 

 discriminate those higher groups, we will at once commence 

 with the enumeration of the species. 



* By Bailliere Bros., 530 Broadway, New York. Price, $3.00 cloth, or 

 $1.75 paper. 



