MUSEUM OF COMPARATIVE ZOOLOGY. 191 



Observations on the Duplicates of the Genus Partula F^r., con- 

 tained in the Museum of Comparative Zoology, Cambridge, Mass., 

 formerly belonging to the Collection of the late William H. Pease. 

 By William Dell Hartman, M. D. 



Since the completion of my Bibliographic Catalogue of the Genus 

 Partula, through the kindness of Prof. Alexander Agassiz of the .Mu- 

 seum of Comparative Zoology, I have been favored with all the dupli- 

 cates of Partida belonging to the institution, amounting to two bushels. 

 An inspection of this vast amount of material has afforded me a rare 

 opportunity of observing the relative abundance and variation of a 

 number of species, and the notes taken at the time I offer as a sup- 

 plement confirmative of the conclusions arrived at in the paper above 

 mentioned. The original labels belonging to the different parcels were 

 often misplaced or absent. These omissions were of no moment, as a 

 previous study of all the species enabled me to determine the specific 

 status of each parcel. 



P. varia and P. rosea Brod., together with P. faba Mart., were in the 

 greatest abundance, and for relative numbers were present in the order 

 mentioned. 



P. varia Brod., represented by six quarts, exhibited all the varieties 

 mentioned by authors, all of which, however, are included by Mr. Brode- 

 rip under the expressive name of P. varia. 



P. rosea Brod. was next in abundance, in which the elongated white 

 variety = P. cognata Pse. Mss. largely predominated over the rose, pur- 

 ple, and party-colored varieties. From the great number of examples of 

 these two species they would seem to be very abundant. 



In four quarts of P. faba Mart, the white and oblique striated vari- 

 eties predominated over the banded variety, which latter = Martyn's 

 type. 



P. dubia Garr. Mss. was represented by two quarts. The specimens 

 are all somewhat smaller than typical P. faba, always dentate, and occa- 

 sionally one exhibits the brown bands of P. faba var. Amanda Garr. 

 Mss. 



P. formosa Pse. Mss., P. lugubris Pse., P. OarrettU Psi\. and 

 P. Thalia Garr. Mss. were next in abundance and in the order men- 

 tioned. P. Thalia and P.formosa are doubtless good Bpeoies, although 

 Mr. Cuming regarded the latter as a variety of /'. davtifera Pfr. 



