136 Proceedings of Indimia Academy of Science 



defined sinus, by its somewhat more slender form vertically and by 

 its slightly greater globosity. Mr. Dall confirmed my opinion of the 

 distinctness of this form by comparision with the original of his M. 

 sapotilla, replying as follows: "The Mulinia which you sent agrees 

 exactly with the specimen from the Pliocene of the Satilla River, 

 Georgia, which I identified with my M. sapotilla from the Shell Creek 

 Pliocene of Florida. After a compai'ison with yours, the differences 

 seem constant." The same species probably occurred in the material 

 which Dall had from the Frank Muse Place, but he did not compare 

 my specimen with that material. The illustration, in the reference 

 referred to above, seems to me to be M. lianisi, without question. 



The type is a right valve in the Harris Collection, Department 

 of Geology, Cornell University, Locality 134. 



Length 15.8 mm.; height, 10.4 mm.; length in front of median line 

 through the beak, 5 mm. : length behind the median line, 10.8 mm. ; thick- 

 ness, 3.4 mm. 



Palndesf.rina chilli n. sp. Fig. 4. 



Six smooth whorls; no umbilicus nor umbilical chink; whorls slightly 

 flattened, angularly shouldered just below the suture; mouth slightly 

 extended anteriorly in a somewhat flattened lip, departing from oval 

 shape due to this extension, the flattening and the slight sutural shoulder; 

 apex small, blunt. The mouth of the type is not entire, so it is impos- 

 sible to say whether the peristome is thickened or not. 



Length, 5 mm. ; width, 2.1 mm. 



The type is in the Harris Collection, Cornell University. 



Pahidestnna olssoni n. sp. Fig. 5. 



Six smooth, evenly tapering, somewhat convex, unshouldered whorls; 

 very small umbilical chink; apex acute; peristome unthicknened, oval. 



Length, 4.35 mm.; width, 2.13 mm. 



This species is named for my friend, Mr. Axel Olsson. 



The type is in the Harris Collection, Cornell University. 



