THE NAUTILUS. 129 



Oddly enough, v. Martens says that " perhaps also the Brazilian 

 H. bifasciata and H. lonchodoma may find their natural place in 

 this subgenus." The " perhaps " might well have been omitted in 

 view of the fact that H. bifasciata is the type of the group ! The 

 curious S. sigmoides of Morelet is placed with doubt in Solarop- 

 sis. 



The genus Polygyra is adopted in the sense in which it is 

 understood by myself and later American writers. Two new spe- 

 cies of Polygyra are described and figured. 



Of the genus Strobila an interesting form, S. salvini Tristr., is 

 described and figured. It is from N. Guatemala and resembles our 

 S. labyrinthica, but the umbilicus is much wider. 



The part concludes with the genus Labyrinthus. This group 

 will prove to be a subgenus or section only of the genus Caracolus, 

 as defined by me in 1889. The anatomical characters of Caracolus 

 and its sections, Lucerna, Dentellaria, etc., have been discussed in 

 the Proc. Acad. N. S. Phila., during the past year. 



NOTES UPON DR. v. IHERING'S OBSERVATIONS. 



BY H. A. PILSBRY. 



The paper upon New Zealand Helices by our distinguished South 

 American correspondent calls to mind a few thoughts which may be 

 of interest to those who have read the previous articles. 



It may be stated here, although the matter of no consequence, 

 that my two articles upon this subject were published respectively 

 two and one month prior to the issue of the zweiter Theil of v. Iher- 

 ing's paper^ (the portion containing his remarks upon New Zea- 

 land forms), although there is no doubt that the latter was written 

 before mine, in fact during 1891. Our essential agreement upon 

 certain points is a great satisfaction to me because it is a strong 

 recommendation of the truth of those views. Especially is this the 

 case in the estimation made by each of us of the systematic value of 

 the mucous pore in Zonitidoe, and in the reliance upon characters of 

 the generative system for the foundation of generic groups of Pul- 

 monates. In regard to the mucous pore the writer wrote emphatic- 

 ally some years ago, that it could not be a family character, and in 

 some cases is not even generic. Should we make a new "family" 



' Zeitschr. f. Wiss. Zool.. 54, drittes Heft. Ausgegeben den 4, Oct- 

 ober, 1892. Eeceived at Philadelphia, Oct. 25, 1892. 



