MUSEUM OF COMPARATIVE ZOOLOGY. 



215 



P. strigosa, var. subcarinata, 

 Hemphill. 



See the 



Patula strigosa. 



Among the shells recently collected by Mr. Hemp- 

 hill at Old Mission, Coeur d'Alene, Idaho, was a 

 marked variety of this species, for which Mr. Hemp- 

 hill suggests the name subcarinata. The specimens 

 vary greatly in elevation of the spire, and in the num- 

 ber and disposition of the revolving bands, often 

 quite wanting. All have a very heavy shell, the body 

 whorl of which has an obsolete carina which is well 

 marked at the aperture, modifying the peristome very decidedly, 

 figure. 



In examining the genitalia I find the base of the duct of the genital bladder 

 greatly swollen along a fifth of the total length of the duct. 



On the banks of the Salmon River, Idaho, Mr. Hemphill found a form like 

 var. Gouldi, but distinctly carinated. None of the Utah 

 individuals of this form are so characterized. 



Another form of strigosa from the same locality is very 

 large, flat, with a transversely oval aperture, the ends of the 

 peristome so nearly approached as almost to touch, and 

 often joined by a heavy callus, which forms a continuous 

 rim around the aperture. Mr. Hemphill has called this 

 var. jugalis. 



Patula strigosa, var ju 

 galis, Hemphill. 



Microphysa pygmaea. 



Found by Mr. Hemphill at Old Mission, Cceur d'Alene, 

 Idaho. 



Microphysa Ingersolli, inland. 



A better figure of this species is here given. 



Triodopsis Hemphilli. 



Mr. Tryon has suggested the name binom- 

 inata for this species, though Hemphilli is 

 not preoccupied in Triodopsis. 



Microphysa Inger- 

 solli, enlarged. 



Triodopsis Sanburni, 

 enlarged. 



Triodopsis Sanburni. 



The cut is drawn from one of the original specimens. 



Mesodon ptychophorus. 



At Old Mission, Cceur d'Alene, Idaho, Mr. Hemphill found 

 a form of this species characterized by a heavy, dead white 

 shell with scarcely any trace of ribs or wrinkles of growth 

 which are usually so characteristic of the species. On the 

 banks of the Salmon River he found a small form, the lesser 

 diameter of which is only 12 mm. See figure. 



Mesodon ptycho- 

 phorus, var. 



