THE NAUTILUS. 10;! 



seen with a good lens, though it was not noticed by Say, who probably 

 worked with what would now be thought an inferior glass. In cen- 

 tral and southern Texas a large race occurs, in which the shell attains 

 a diameter of (i mm. It is always distinctly perforate, pale and pellucid. 

 The difference between this and the form from other regions is slight. 

 but seems correllated with geographic position. Some hundreds of 

 specimens have been examined, from New Braunfels, Hidalgo, San 

 Antonio, etc. I have seen this form labelled " Z. scidptilif, " by 

 some collectors, and Mr. Binney so identified the specimens collected 

 in Texas by Hemphill, some of which are before me. (Man. Amer. 

 \i. Sh. p. 219). It is quite unlike true sculptilis, but approaches Yii- 

 rea carolinensi* Ckll., which is a geographically separated mountain 

 form, very close to imlrntata, though, I believe, sufficiently distinguish- 

 able. 



SUCCINEA RETUSA MAGISTER n. var. Distinguished from 8. r< - 

 fttsa Lea (ovalls Grid, not Say) by its larger size, less developed spire 

 and larger aperture. Alt. 18, greatest width 9o-10, length of aperture 

 13-14 mm. 



A common form in the northern Mississippi valley, sufficiently un- 

 like ' oval is " to be separated therefrom by collectors generally, and 

 frequently called " S. JUgginsi.' 1 ' It is No. 35Sa, of the catalogue. 

 Types are from Rock Island, Illinois, collected by myself. 



PUPA DECORA AND ITS ALLIES. An excellent series of the typical 

 /'itpa decora having been secured by Mr. P. B. Randolph in the 

 Dye a Valley, it is possible to institute more satisfactory comparisons 

 with allied forms than the limited number of specimens before avail- 

 able permitted P. decora seems to vary but little. Of its imme- 

 diate allies 1'. corpulenta Morse is very near decora, perhaps only 

 varietally distinct. P. cot/cinnula, Ckll. is a smaller shell, with 

 elongated lamina; rather than denticles within the outer lip. It oc- 

 curs in Colorado, and I have received specimens from the Jemex. 

 Mountains, New Mexico, collected by Rev. E. H. Ashmun. P. co- 

 /umbiana Sterki is an apparently valid species of this group, though 

 not yet described; and I have still another form from near Lake Su- 

 perior which is allied to P. decora, but differs in smaller size, in hav- 

 ing another denticle at the foot ot the columella (five in all, instead of 

 four), and a sharper, higher crest behind the outer lip. the edge of the 

 latter more projecting in a point above, when seen in a profile view. 

 This may be called J\ipa (Neafctula) svperiori*. The west 



