74 BULLETIN 90, UNITED STATES NATIONAL MUSEUM. 



MUREX (CHRYSOSTOMA van?) CHIPOLANUS Dall. 



Murex cJnysostoma Gray, var. cMpolana Dall, Trans. Wagner Inst., vol. 

 3, pt. 1, p. 139. 



Oligocene of the Chipoia marl, at the county bridge over the 

 Chipola River, Calhoun county, and, possibly, of the Tampa silex 

 beds at Ballast Point, Tampa, Florida. U. S. Nat. Mus. No. 165086. 



The specimens differ from the typical recent M. chrysostoma in 

 being smaller, with a somewhat shorter canal, from which the ante- 

 cedent canal tends to divaricate, while in the typical chrysostoma 

 it is usually continuous. The anterior margin of the varices in the 

 fossil also tends to be more spinose, having the projecting points 

 more produced than in the recent shell, though similar in number 

 and situation. 



MUREX SEXANGULA, new species. 



Plate 13, fig. 11. 



Shell small, stout, rather short, with about 6 whorls of which the 

 nuclear one and a half are smooth and rounded, the subsequent 

 whorls subtabulate, with 6 well-developed varices; suture deep, dis- 

 tinct; whorls rather abruptly shouldered, but not keeled; varices 

 continuous and somewhat retractive, the line ascending the spire 

 making about a quarter turn ; spiral sculpture of about five rounded 

 ridges, one behind the shoulder, subequally spaced, the two near 

 the periphery closest, wdiich are most prominent on the back of 

 the varices and obsolete in the spaces between the varices; 

 besides these there are numerous spiral grooves with wider, flat- 

 tened interspaces which cover the whole surface and end in minor 

 crenulations on the recurved edges of the varices: axial sculpture 

 only of incremental lines and the varices, which are thick, recurved, 

 longitudinally striate in front, finely crenulate at the recurved edge, 

 with about five projections corresponding to the ends of the spiral 

 ridges, of which the most prominent is at the shoulder; aperture 

 rounded, the outer lip with six or eight feeble lirations internally; 

 inner lip smooth, continuous, partly free from the body whorl, canal 

 rather wide, open, with a strong siphonal fasciole; a very narrow 

 umbilical chink present. Length of shell (canal slightly defective) 

 22, of aperture 6.5, maximum diameter 14 mm. 



Tampa silex beds at Ballast Point, Tampa Bay, Florida. 



One specimen from the Post collection, U. S. Nat. Mus. No. 165086. 



MUREX TROPHONIFORMIS Heilprin. 

 Plate 9, fig. 7. 

 Murex trophoniformis Heilpkin, Trans. Wagner Inst, vol. 1, p. 107, pi. 15, 

 fig. 40, 1887.— Dall, Trans. Wagner Inst., vol. 3, pt. 1, p. 140, 1890. 



Tampa silex beds, Heilprin and Post ; Chipola marl, at the county 

 bridge, formerly Bailey's Ferry, Chipola river, Florida, Dall. U. S. 

 Nat. Mus. Nos. 115771 and 214440. 



