THE NAUTILUS. 91 



the outer one peripheral in position; a single palatal plica is generally 

 developed. These plicae form a curved, very obliquely radial series, 

 the inner end near the aperture. The two inner basal lamellae are 

 much stouter and higher than the others, the second from the axis 

 (or third, counting the axial) being the longest and highest of the 

 plicae. 



Alt. 1.8, diam. 2.5 mm. 



Florida: Type No. 77044 A. N. S. P., from Miami, collected by 

 S. N. Rhoads, 1899. Also widely distributed over the State. Tal- 

 lahassee (C. "W. Johnson, 1900). St. John's valley, Volusia and 

 Marion counties (Johnson and Pilsbry, 1894) and many other 

 localities. 



This species resembles S. virgo Pils. in shape and peristome, but 

 it differs in the more widely spaced ribs, continued over the base. 

 It differs from all known North American species by the much more 

 deeply entering parietal lamella, the inner ends of which pass under 

 the parietal callus of the aperture. In other species these lamellae 

 are only about a half whorl long. The inner basal plicae are also 

 placed more deeply within than in other species. S. texasiana Pils. 

 and Ferr. resembles S. jloridana in shape and in having a ribbed 

 base, but the sculpture is much closer and the lamellae do not extend 

 so far inward. 



S. floridanus is a common and widely distributed species in Florida. 

 A depressed and angular form of S. labyrinthicus resembling S. I. 

 strebeli occurs in some places, and S. hubbardi (A. D. Brown) also 

 has a wide distribution on the peninsula and keys. 



Several other races of Strobilops will be defined in a future paper. 

 The shells have to be opened carefully to demonstrate the internal 

 structure, but fresh specimens can usually be determined without 

 opening. Information is especially desired by the writer on the 

 forms of New York State, and will be duly credited in a monograph 

 of that fauna now in preparation. 



MOLLUSKS FROM KANSAS AND OKLAHOMA. 



BY FRANK C. BAKER. 



During the past year Mr. F. B. Isely, Professor of Biology in the 

 Oklahoma University Preparatory School, Tonkawa, Oklahoma, has 

 sent to the Chicago Academy of Sciences several interesting lots of 



