116 THE NAUTILUS. 



In 1897 von Martens (Moll. Weber, p. 20) reaffirmed his 

 position of 1865. 



Bartsch in his monographic paper on "The Philippine Pond 

 Snails of the Genus Vivipara" (Pr. U. S. Nat. Mus., XXXII, 

 1907, pp. 135-150) followed Philippi and referred the Philip- 

 pine species to angularis Miill. 



Kobelt in his recent monograph of the Viviparidse (Con. 

 Cab., 1908, p. 230) adopts von Martens' position and calls the 

 Philippine species costata Q. and G. But while he states (1. c. 

 p. 122) that in his opinion the smaller, spirally-sculptured 

 Chinese species should be divided into groups represented by 

 angularis Miill. and quadrata Bens., he retains Benson's name 

 for practically the whole Chinese series and neither figures nor 

 describes, except in a very general way, the particular Chinese 

 form that he would consider to be the real angularis. 



None of the above-mentioned authors with the exce r tion of 

 Philippi, Kuster and von Martens, refer in any way to the fig- 

 ures and remarks of Chemnitz in the original Conchylien Cab- 

 inet. If they were acquainted with that work they omitted to 

 make any reference to it, and if they were not it is difficult to 

 understand how they came to refer costata Q. and G. to Miiller's 

 species. 



I am indebted to Dr. Pilsbry for the reference to Chemnitz, 

 the photographs of his figures reproduced on pi. VIII, the trans- 

 lation of his remarks and for permission to use the illuminating 

 note that follows. 



The translation is as follows: 

 Tab. 134. Fig. 1222. 1223. 

 Ex Museo Spongleriano. 



The greenish river-snail with three-fold keels on each 

 whorl. 



" Helix angularis, testa cornea, viridescente, in quovis anfractu 

 tricarinata, apertura rotunda subangulari. ' ' 



M filler, Histor. Verm. no. 373, p. 187. 



Then follows Miiller's diagnosis. 



"This river snail is covered with a dark green coat. It has 

 a quite conic formation, and a mainly circular, but still some- 

 what angular, aperture. It will be most conspicuously and 



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 II 



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