THE NAUTILUS. 81 



die, the columella and aperture airree fairly well with the descrip- 

 tion, but the color is a uniform brownish buff, darker slightly on the 

 base. They are close to certain unicolored forms of B. virgulatus, 

 Rve. of the West Indies, and certainly seem diffei-ent from anything 

 I have seen bearing the name of Dormani, Marielimis or Floridanus. 

 Mr. Calkins collected several years in Florida for the Chicago Acad. 

 Nat. Sciences, published a catalogue of Florida shells and furnished 

 a good deal of material for the Nat. Museum, and his localities seem 

 to be reasonably accurate. I may remark in passing that B. stram- 

 ineus Guild., of the Isle of St. Vincent, is extremely close to the uni- 

 colored forms of BuUmulus Dormani. 



DESCRIPTION OF A NEW SPECIES OF ANCTUS. 



BY JOHN FORD. 



Anctus Pilsbryi, Ford, N. Sp. 



Shell rimate-umbilicated, ovate-conical, spire acute, apex black ; 

 whorls 7, slightly convex, the last somewhat constricted near the base. 

 Aperture extremely narrow, oblong ; lip flatly reflected, the central 

 portion for about two-thirds of its length provided with a flange ex- 

 tending toward the inner or columellar lip from which proceeds a 

 corresponding convexity thus giving to the aperture a form much 

 like the traditional key hole. Color light gray, painted longitu- 

 dinally with brownish and black lines. 



Length of shell 23, length of aperture 12, width between flanges 

 1 mill, width of flange on outer lip 2 mill. Color of lip wdiite. 



Habitat Brazil. 



Anctus angiostoma and A. Pilsbryi are the only living species of 

 the subgenus known and they are in some respects very much alike. 

 In the former, however, the apex is not black and shining nor are 

 the apertures at all alike, save in general outline. Indeed that of 

 A. Pilsbryi is absolutely distinct from any other known to the writer. 

 This alone would justify its specific separation, and it will be a 

 miracle perhaps if a form so peculiar does not appeal to the genus 

 makers as well.' 



Phila. Pa., Oct. 13th, 1890. 



1 The above description is chiefly drawn from memory, as the shell was un- 

 fortunately mislaid before the less salient features were thoroughly verified. It 

 can be understood, however, that all of the characters given above are approx- 

 imately correct. 



