PBOCEEDINGS OF THE NATIONAL MUSEUM. 43 



landicus of the newer Miocene, aud to G. Jioridamis, Pliocene and recent, 

 tlian to any of tlie Antillean fossils witli wliicli I have coiiioared it. 



CONUS ISOMITRATUS, new species. 



Shell small, solid, short, stont, with a rather low spire of eight or nine 

 whorls beside the uuclens ; a single elevated thread runs at the shoulder, 

 on which the suture is laid; between the sutures, which are dee^) and 

 distinct, the whorl is convex, turgid, with only incremental lines; in 

 front of the shoulder the sides are slightly swollen, the posterior half 

 obsoletely spirally striate or smooth, anteriorly with distinct spiral 

 threads and equal interspaces crossed by conspicuous lines of growth; 

 the siphonal fasciole distinct, swollen, showing as a rounded ridge; 

 outer lip straight, thin, sharp; anal notch shallow, aperture narrow, 

 siphonal notch deep; pillar with the edge thickened and twisted, form- 

 ing in welldevelo])ed specimens with tlie siphonal fasciole two obscure 

 plaits; body with little or no callus. Longitude of shell, 1*8; of spire, 

 5; maximum diameter, IS mm. 



Habitat.— C\u\)o]ii beds (2212, 2213), Cliipola River, Florida, and 

 Alum Blutt' beds near De Fuuiak Springs (2238). 



Types.— 1^0. 113980, U. S. N. M,; and in the collection of Mr. Aldricli. 



The young of this species have nine or ten deep grooves, with nar- 

 rower interspaces, covering a little more than the anterior half of the 

 shell. These grooves during growth become gradually modified to the 

 adult sculpture. 



CONUS ISOMITRATUS var. SULCULUS, Dall. 



Shell resembling the tj'pe, except that the sutural border or shoulder 

 of the shell is flattened or excavated m itli a few or numerous s])iral 

 grooves upon its surface. It is also larger. Longitude of spire, 5; of 

 shell, 38; diameter, 24 mm, 



7/rtZ>//rt/.— Chipola beds (2212, 2213), Chipola River, Florida. 



Tyjyes.-^o. 113024, U. S. N. M, 



The transition from a concave to a turgid sutural border, from smooth 

 to spirally grooved, is quite gradual, though the extremes have a very 

 diherent asi)ect, and would, by some writers, be put in different sections 

 of the genus. This species recalls C. mxs of the recent fauna as much 

 as any species. It is nuich shorter and stouter than the line which 

 begins with C. sanridcns et al., and is represented in the present fauna 

 by G. (laiicus. 



CONUS DEMIURGUS, new species. 



Shell large, elongate, with a large, somewhat bulbous, nucleus, and 

 about 10 su))sequent whorls; spire low, in the young nearly flat, with 

 a distinct but not channeled sutuie; shoulder of the whorl angular, the 

 space between the sutures flattish or feebly excavated, sculptured with 

 obvious lines of growth, crossed by few, faint, obsolete, spiral, traces; 



