THE NAUTILUS. 3 



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

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

 ing of grooves inclosing mostly hexagonal lozenge-shaped spaces, 

 which are themselves rugose. Color, uniform l)rown-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 gray tinge. Foot brow'n. Internal shell solid, easily 

 extricated without breaking. 



Cuyamaca ^Mountains, San Diego Co., California. 



Jaw low% wide, 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 onl}- on either side are laterals. Centrals tricuspid, laterals 

 bicuspid, marginals quadrate, l»luntly bicuspid. 



I am indebted to Mr. Binney and Mr. Cockerell for assistance 

 in 2)reparing the above description. 



TWO NEW SPECIES OF U. S. LAND SHELLS. 



BY H. A. PILSBRY. 



Zonites Shhnekii Pilsbry. This is a larger form than Zonites 

 limatnlus, much less depressed. The specimens are from the 

 Loess formation, at lo^va 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. limatiiliis. 



Alt. 3, diam 6 mill. 



Pupa syngenes Pilsbry. Shell subcylindrical but Avider above, 

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

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

 whorl ascending, imperforate, bearing a strong high crest just behind 

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

 small parietal denticle. Alt. 3f, diam. If mill. 



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

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

 monstrosities of the common P. mxiscor%im. The shells are labeled 

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



[Since the above paragraphs were in type, I have received a com- 

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



