178 



PROCEEDIXGS OF THE \ \TI<>\.\L MUSEUM. 



vol. 38. 



the trees as to make them faintly white in places as large as the palm of one's hand. I 

 estimated thai on Bome of the cacti there were fully •"><)(> shells of all sizes. They 

 seemed to prefer the vicinity of the ground and I saw very few shells on the upper 

 branches or on the leaves. I did not see any shells until the path approached the hank 

 of the si ream at an altitude of aboul 50 feel a hove the level of the water. Our path ran 

 beside the bank of t he si ream for at least 2 miles and possibly 3, the shell- occurring in 

 greal profusion during the entire distance. After we crossed the river on the bridge 

 we saw no more shells, for we climbed at once to the terrace a couple of hundred feet 

 above the river and thus proceeded to Pajonal. 

 The shells occur on the trees in the ini mediate foreground of the picture. 



The shells comprised various species and varieties of Bvlimidus and 

 a single species of Clausilia. The latter was submitted to Dr. II. A. 

 Pilsbry, who has kindly furnished a description of it. 



in, i View of tmk Km Pampas looking downstream. 



LIST OF THE SPECIES COLLE< TED. 



BULIMULUS (BOSTRYX INFUNDIBULUM Pfeiffer. 



Bulimulus infundibulum Pfeiffer, Proc. Zool. Soc. London, L851, p. 255. — 

 Moreu i. S.'r. Conch., vol, 3, L863, p. 204, pi. 11, fig. 6. 



The specimens «»l»t ained were some 20 millimeters Long, the vert ical 

 lengl It of t he aperl ure being 7 millimeters. The color variat ions w ere 

 ashy white with a brownish nucleus, the same streaked with tawny 

 brown, and lastlj with two (not one us stated by Morelel in contra- 

 did ion to his figure) brown spiral hands. The apex is more produced 

 and mammillary than in Morelet's figure. He states that it was 

 found on grasses in stony places, and gives the habital as the high- 



