106 THE NAUTILUS. 



1 1-2045. 



22 00300. No. 3 very faint, translucent. 

 800000. 



In a large proportion of the 186, 12345, bands 1 and 2 are very 

 close together, but separated by a distinct but very narrow light line. 

 In many of the (12)345 the union of 1 and 2 is indicated by a 

 lighter space in the center of the band. It will be interesting to get 

 further collections from this locality and see if the proportion of 

 (12)345 shells increases, as this lot seems to indicate. 



The shells are rather thin and very uniform in size, the average 

 being about 18X15X14 mm. The largest shell measures 

 21 X 18 X 16^ mm., and in this shell bands 1 2 and 3 are unusually 

 wide. The smallest shell measures 16| X 14 X 12 mm. 



Since my note in THE NAUTILUS, xiv, p. 72, I have received 8 

 additional H. hortensis from near the headwaters of Robinson's River, 

 Newfoundland, as follows : Four (12345), one 1(234)5, three 00000. 

 GEO. H. CLAPP. 



PUBLICATIONS RECEIVED. 



MOLLTSCA OF THE SOUTHWESTERN STATES. II. By H. A. 



Pilsbry and J. H. Ferriss. Proc. Acad. Nat. Science, Philadelphia, 

 1906, pp. 123-175. 



This important paper completes the review of the southwestern 

 mollusca collected by the authors in Texas, New Mexico and Ari- 

 zona, with the exception of Omphalina and the Unionidse. Although 

 any attempt to a complete faunal monograph is expressly disclaimed, 

 this paper and its predecessor (P. A. N. S. P., 1905, p. 211) will be 

 found to contain practically all the reliable data extant upon the 

 fauna of southeastern Arizona and western Texas. The molluscan 

 fauna of this region, like the reptilian, shows that the transconti- 

 nental zones of distribution as established by Merriam cannot be 

 maintained in the Mediocolumbian region for these lower forms of 

 life, but that " these zones are secondary divisions of vertical life 

 areas of which the molluscan faunas were evolved in large part 

 independently." 



While the range of practically all the Austroriparian species is 

 limited on the wpst by the rise between the 96th and 98th meridians 

 of longitude, marking the approximate limit of the Cretacious forma- 



