50 



LAND AND FRESII-WATER SHELLS OF N. A. [PART III, 



M. Integra, var. ru/a. 



the plates of his Monograph were drawn, are deposited by him 



in the collection of the Academy at 

 Fig. 103. Philadelphia. Fig. 102 is a fac- 



simile of the figure referred to by 

 Haldeman under this name. No. 

 8905 of the collection represents it. 

 This variety is represented by eight 

 of the lots catalogued below in the 

 museum register. One of them has 

 the spire truncated, the surface very 

 much eroded, a more globose form, 

 and more sinuous pcritreme than usual (see Fig. 103). The 

 whole shell under the epidermis appears of a rosy hue. 



Pahidina subsolida, Anthony, appears to me also a synonym 

 of this species. My opinion is founded on an examination of Mr. 

 Anthony's specimen, kindly lent me for figuring (Fig. 104). It is 

 also so considered by Reeve. No. 9311 was presented to the collec- 

 tion under tliis name by Mr. Anthony. His description here follows. 



Pahidina suJisolida, Anthony. — Shell ovate, imperforate, very thick ; color 

 light green, verging to brown in old specimens ; spire much elevated, com- 

 posed of 6 — 7 inflated whirls ; sutures very distinct ; aperture broad-ovate, 

 about one-third the length of the shell. 

 Fig. 104. within white ; lip curved forward and form- 



ing a very conspicuous, subacute tip near 

 its base ; columella well rounded, a thick 

 callous deposit covering the umbilicus. 

 Length 2 inches, breadth 1} inches. 



Illinois. My cabinet ; cabinet of Hugh 

 Cuming, London. 



This is the most ponderous species in the 

 genus, far exceeding P. ponderosa, Say, in 

 that respect ; compared with that species it 

 is not only much more solid and heavy, but 

 its spire is proportionally more elongate, 

 whirls more convex, while the body whirl is 

 less ventricose, and the aperture is uncom- 

 monly small for a Paludina of its size ; the 

 Paludina subsolida. body whirl is disposed to be angulated near 



its middle ; all the whirls are more or less 

 shouldered and the lines of growth are very conspicuous ; the body whirl 

 is obscurely striate concentrically, and its surface thereby modified so as 

 to present a faintly sculptured appearance, and the strise being somewhat 

 finely undulated the appearance under a microscope is very pleasing. 

 (^Anthony .) 



