THE NAUTILUS. 139 



POLYGYRA LABROSA FIMBRIATA n. Vat. 



Differs from the type in having a well-developed peripheral 

 fringe of two or three rows of hairs about 0.25 mm. in length, 

 the hairs also showing as a sutural fringe, and the "prostrate 

 hairs," of Eland's original description, are much more elevated. 

 On the base are spiral rows of short, erect bristles continuing to 

 the umbilicus. Aperture typical. 



Diameter 11, altitude 6 mm., whorls 5. 



Sulphur City, Washington Co., Arkansas. Collected by A. 

 J. Brown, Jan., 1917. Types No. 8112 of my collection. 

 Paratypes in collection of A. J. Brown. Fifteen adults and as 

 many young examined. 



Over forty labrosa from seven localities in Arkansas and twenty 

 from Galloway, Mo. , including one from Bland and two others 

 labeled "Identified by Bland," were examined. Three shells 

 from Clinton, Ark., show traces of hairs and three fresh shells 

 in the Galloway lot also show some hairs, but in neither case 

 are they as prominent as in the Sulphur City shells. 



In P. A. N. S., Feb. 1903, p. 202, Dr. Pilsbry says : " In all 

 other Stenotremes except P. barbigera (Redf. ) the cuticular hairs 

 form a comparatively close pile. ... In no other (except 

 pilsbryi} do they form a series of circular, concentric fringes. 

 P. barbigera has a single fringe of similar filaments, usually 

 persisting at the suture only." This is true of the average cab- 

 inet specimen, but both barbigera and spinosa have a peripheral 

 as well as a sutural fringe, and both have hairs arranged in 

 spiral rows on the base when carefully prepared, as shown by 

 hundreds of specimens collected by Herbert H. Smith in Ala- 

 bama, and I have shown in the NAUTILUS, Vol. XXVII, p. 12, 

 that P. edwardsi has well developed fringes when fresh. In 

 the note on edwardsi there is a mistake in giving the length of 

 the hairs as 1 mm., it should be mm. When the note on P. 

 edwardsi was written I had forgotten that A. G. Wetherby had 

 called attention to this same fact in his very valuable paper 

 "Some Notes on American Land Shells," No. 1, p. 2 of an 

 undated "separate." The paper was published in the Journal 

 of the Cincinnati Society of Natural History. 



