THE XAUTILUS. 3 



tie free in front as far as respiratory orifice. Back rather bluntly 

 keeled its whole length ; ruga? rather flattened and obtuse, consist- 

 ing of grooves inclosing mostly hexagonal lozenge-shaped spaces, 

 which are themselves rugose. Color, uniform brown-black without 

 markings, except some dark marbling on the lighter sides. The por- 

 tion beneath and in front of the mantle is pale, and the head and 

 neck have a grav tinge. Foot lirown. Internal shell solid, easily 

 extricated without breaking. 



Cuyamaca Mountains, Ban Diego Co., California. 



Jaw low, Avide, slightly arcuate, ends blunt, anterior surface with 

 about twenty wide, flat ribs, squarely denticulating either margin. 



Lingual membrane short and narrow. Teeth 20-1-20, of which 

 eight only on either side are laterals. Centrals tricuspid, laterals 

 bicuspid, marginals quadrate, bluntly bicuspid. 



I am indebted to ]Mr. Binney and Mr. Cockerell for a.ssistance 

 in preparing the above description. 



TWO NEW SPECIES OF U. S. LAND SHELLS. 



BY II. A. PILSHRY. 



Zonites Shimekii Pilsbry. This is a larger form than Zonites 

 limatulus, much less depressed. The specimens are from the 

 Loess formation, at Iowa City, Iowa, collected by Prof B. Shimek 

 and the writer some years ago. Being fossil, they lack color and 

 epidermis. The sculpture is similar to Z. limatulns. 



Alt. 3, diam 6 mill. 



Papa syugenes Pilsbry. Shell subcylindrical but wider above, 

 composed of 8 narrow, convex whorls, sinistraUij convoluted ; text- 

 ure as in P. muscorum, but color rather lighter brown. Last 

 whorl ascending, imperforate, l^earing a strong high crest just behind 

 the outer lip. Aperture shaped as in muscorum, having a single 

 small parietal denticle. Alt. 3|, diam. It mill. 



Two specimens of this form are before me, and I am in doulit 

 whether to give them a new name, as they may be only sinistral 

 monstrosities of the common P. miLscorum. The shells are labeled 

 "Arizona^' in the Academy collection, collector not known. 



[Since the above ]:)aragra])hs were in ty])e, I have received a com- 

 munication from my friend Dr. V. Sterki, to whom I sent a speci- 



