THE NAUTILUS. 119 



whether they were in the Museum. But he replied that much 

 of their collection and nearly all of their types had been stored 

 in the cellars for safety and that consequently the desired in- 

 formation could not be obtained at present. Now that the war 

 is over, the Museum collections will, no doubt, be returned in 

 due time to their normal condition and then, if the original 

 types have been preserved, a critical examination can be made. 



In view of the uncertainty as to just what Lesson's species is, 

 it does not seem to be desirable to change the well-known and 

 unquestioned name for the species until more definite informa- 

 tion can be had in regard to the earlier one. 



Viviparus costatus (Q. and G.) came from Lake Tondano, 

 North Celebes and is described as being ' ' verj' ventricose, 

 fragile and thin, spire obtuse, whorls rounded, carinated by a 

 considerable number of acute lirations, of which two or three 

 are more prominent, and very finely longitudinally striate. 

 Aperture almost circular, slightly angled above, umbilicus 

 narrow and deep. Length 27.66, diam. 22.56 mm." 



As shown by the original figures copied on pi. IX, figs. 9-10 

 and fig. 6 on pi. X from a specimen from Sukur, Celebes, 

 labeled ^^ angular is Miill." by Brot, the shell has two principal 

 carinas, one at the periphery and the other forming the edge of 

 the prominent, wide shoulder; between these are a number of 

 lesser lirations, of which two are usually somewhat stronger 

 than the others. The penultimate whorl is much smaller than 

 the body-whorl owing to the width of the shoulder, and the spire 

 is short and obtusely conical. 



I have not seen any typical V. costata from the Philippine 

 Islands. 



Kobelt (Con. Cab., Viviparida^ 1908, p. 230) has called at- 

 tention to the fact that the shell figured by Bartsch (Pr. U. S. 

 Nat. Mus., XXXII, 1907, pi. X, fig. I) from Luzon as typical 

 " angidaris^' (costatus) does not represent the type from North 

 Celebes. It was very properly united with V. burroughianus by 

 Bartsch and will probably, when large series are obtained, be 

 found to intergrade with it quite completely, but at present, at 

 least, it seems entitled to varietal rank. 



